Remove unnecessary code (#4141)

src/main/java/com/thealgorithms/ciphers/Blowfish.java

@@ -1079,7 +1079,7 @@ public class Blowfish {
      */
     private String hexToBin(String hex) {
         String binary = "";
-        Long num;
+        long num;
         String binary4B;
         int n = hex.length();
         for (int i = 0; i < n; i++) {

src/main/java/com/thealgorithms/ciphers/HillCipher.java

@@ -160,7 +160,6 @@ public class HillCipher {
             System.out.println(
                 "Invalid key, as determinant = 0. Program Terminated"
             );
-            return;
         }
     }
 

src/main/java/com/thealgorithms/conversions/AnyBaseToAnyBase.java

@@ -175,7 +175,7 @@ public class AnyBaseToAnyBase {
             // If the remainder is a digit < 10, simply add it to
             // the left side of the new number.
             if (decimalValue % b2 < 10) {
-                output = Integer.toString(decimalValue % b2) + output;
+                output = decimalValue % b2 + output;
             } // If the remainder is >= 10, add a character with the
             // corresponding value to the new number. (A = 10, B = 11, C = 12, ...)
             else {

src/main/java/com/thealgorithms/conversions/OctalToDecimal.java

@@ -34,8 +34,7 @@ public class OctalToDecimal {
     public static int convertOctalToDecimal(String inputOctal) {
         try {
             // Actual conversion of Octal to Decimal:
-            Integer outputDecimal = Integer.parseInt(inputOctal, 8);
-            return outputDecimal;
+            return Integer.parseInt(inputOctal, 8);
         } catch (NumberFormatException ne) {
             // Printing a warning message if the input is not a valid octal
             // number:

src/main/java/com/thealgorithms/datastructures/graphs/BellmanFord.java

@@ -74,7 +74,7 @@ start vertex, end vertex and weights. Vertices should be labelled with a number
         for (i = 0; i < v - 1; i++) {
             for (j = 0; j < e; j++) {
                 if (
-                    (int) dist[arr[j].u] != Integer.MAX_VALUE &&
+                    dist[arr[j].u] != Integer.MAX_VALUE &&
                     dist[arr[j].v] > dist[arr[j].u] + arr[j].w
                 ) {
                     dist[arr[j].v] = dist[arr[j].u] + arr[j].w; // Update
@@ -85,7 +85,7 @@ start vertex, end vertex and weights. Vertices should be labelled with a number
         // Final cycle for negative checking
         for (j = 0; j < e; j++) {
             if (
-                (int) dist[arr[j].u] != Integer.MAX_VALUE &&
+                dist[arr[j].u] != Integer.MAX_VALUE &&
                 dist[arr[j].v] > dist[arr[j].u] + arr[j].w
             ) {
                 neg = 1;

src/main/java/com/thealgorithms/datastructures/graphs/BipartiteGrapfDFS.java

@@ -28,7 +28,7 @@ public class BipartiteGrapfDFS {
         for (Integer it : adj.get(node)) {
             if (color[it] == -1) {
                 color[it] = 1 - color[node];
-                if (bipartite(V, adj, color, it) == false) {
+                if (!bipartite(V, adj, color, it)) {
                     return false;
                 }
             } else if (color[it] == color[node]) {

src/main/java/com/thealgorithms/datastructures/graphs/DIJSKSTRAS_ALGORITHM.java

@@ -12,7 +12,7 @@ class dijkstras {
         int min = Integer.MAX_VALUE, min_index = -1;
 
         for (int r = 0; r < k; r++) {
-            if (Set[r] == false && dist[r] <= min) {
+            if (!Set[r] && dist[r] <= min) {
                 min = dist[r];
                 min_index = r;
             }

src/main/java/com/thealgorithms/datastructures/graphs/MatrixGraphs.java

@@ -154,11 +154,7 @@ class AdjacencyMatrixGraph {
      * @return whether or not the vertex exists
      */
     public boolean vertexDoesExist(int aVertex) {
-        if (aVertex >= 0 && aVertex < this.numberOfVertices()) {
-            return true;
-        } else {
-            return false;
-        }
+        return aVertex >= 0 && aVertex < this.numberOfVertices();
     }
 
     /**
@@ -343,14 +339,14 @@ class AdjacencyMatrixGraph {
     public String toString() {
         String s = "    ";
         for (int i = 0; i < this.numberOfVertices(); i++) {
-            s = s + String.valueOf(i) + " ";
+            s = s + i + " ";
         }
         s = s + " \n";
 
         for (int i = 0; i < this.numberOfVertices(); i++) {
-            s = s + String.valueOf(i) + " : ";
+            s = s + i + " : ";
             for (int j = 0; j < this.numberOfVertices(); j++) {
-                s = s + String.valueOf(this._adjacency[i][j]) + " ";
+                s = s + this._adjacency[i][j] + " ";
             }
             s = s + "\n";
         }

src/main/java/com/thealgorithms/datastructures/graphs/PrimMST.java

@@ -17,7 +17,7 @@ class PrimMST {
         int min = Integer.MAX_VALUE, min_index = -1;
 
         for (int v = 0; v < V; v++) {
-            if (mstSet[v] == false && key[v] < min) {
+            if (!mstSet[v] && key[v] < min) {
                 min = key[v];
                 min_index = v;
             }
@@ -80,7 +80,7 @@ class PrimMST {
             {
                 if (
                     graph[u][v] != 0 &&
-                    mstSet[v] == false &&
+                            !mstSet[v] &&
                     graph[u][v] < key[v]
                 ) {
                     parent[v] = u;

src/main/java/com/thealgorithms/datastructures/graphs/TarjansAlgorithm.java

@@ -114,7 +114,7 @@ public class TarjansAlgorithm {
                 stronglyConnCompsUtil(n, lowTime, insertionTime, isInStack, st, graph);
                 //update lowTime for the current node comparing lowtime of adj node
                 lowTime[u] = Math.min(lowTime[u], lowTime[n]);
-            } else if (isInStack[n] == true) {
+            } else if (isInStack[n]) {
                 //If adj node is in stack, update low 
                 lowTime[u] = Math.min(lowTime[u], insertionTime[n]);
             }

src/main/java/com/thealgorithms/datastructures/heaps/FibonacciHeap.java

@@ -234,7 +234,6 @@ public class FibonacciHeap {
         if (!curr.isMarked()) { //stop the recursion
             curr.mark();
             if (!curr.isRoot()) this.markedHeapNoodesCounter++;
-            return;
         } else {
             if (curr.isRoot()) {
                 return;

src/main/java/com/thealgorithms/datastructures/heaps/MinPriorityQueue.java

@@ -51,18 +51,12 @@ public class MinPriorityQueue {
 
     // returns boolean value whether the heap is empty or not
     public boolean isEmpty() {
-        if (0 == this.size) {
-            return true;
-        }
-        return false;
+        return 0 == this.size;
     }
 
     // returns boolean value whether the heap is full or not
     public boolean isFull() {
-        if (this.size == this.capacity) {
-            return true;
-        }
-        return false;
+        return this.size == this.capacity;
     }
 
     // prints the heap

src/main/java/com/thealgorithms/datastructures/lists/CursorLinkedList.java

@@ -174,8 +174,7 @@ public class CursorLinkedList<T> {
         }
 
         // 2- make the os point to the next of the  @var{availableNodeIndex}
-        int availableNext = cursorSpace[availableNodeIndex].next;
-        cursorSpace[os].next = availableNext;
+        cursorSpace[os].next = cursorSpace[availableNodeIndex].next;
 
         // this to indicate an end of the list , helpful at testing since any err
         // would throw an outOfBoundException

src/main/java/com/thealgorithms/datastructures/lists/SinglyLinkedList.java

@@ -407,7 +407,7 @@ public class SinglyLinkedList extends Node {
         list.insert(3);
         list.insertNth(1, 4);
         assert list.toString().equals("10->7->5->3->1");
-        System.out.println(list.toString());
+        System.out.println(list);
         /* Test search function */
         assert list.search(10) &&
         list.search(5) &&
@@ -424,7 +424,7 @@ public class SinglyLinkedList extends Node {
         list.deleteNth(1);
         list.delete();
         assert list.toString().equals("7->3");
-        System.out.println(list.toString());
+        System.out.println(list);
         assert list.size == 2 && list.size() == list.count();
 
         list.clear();

src/main/java/com/thealgorithms/datastructures/queues/CircularQueue.java

@@ -17,21 +17,13 @@ public class CircularQueue {
     }
 
     public boolean isEmpty() {
-        if (beginningOfQueue == -1) {
-            return true;
-        } else {
-            return false;
-        }
+        return beginningOfQueue == -1;
     }
 
     public boolean isFull() {
         if (topOfQueue + 1 == beginningOfQueue) {
             return true;
-        } else if (topOfQueue == size - 1 && beginningOfQueue == 0) {
-            return true;
-        } else {
-            return false;
-        }
+        } else return topOfQueue == size - 1 && beginningOfQueue == 0;
     }
 
     public void enQueue(int value) {

src/main/java/com/thealgorithms/datastructures/queues/Deques.java

@@ -91,13 +91,12 @@ public class Deques<T> {
         if (tail == null) {
             // If the deque is empty, add the node as the head and tail
             head = newNode;
-            tail = newNode;
         } else {
             // If the deque is not empty, insert the node as the new tail
             newNode.prev = tail;
             tail.next = newNode;
-            tail = newNode;
         }
+        tail = newNode;
 
         size++;
     }

src/main/java/com/thealgorithms/datastructures/queues/Queues.java

@@ -177,6 +177,6 @@ public class Queues {
 
         System.out.println(myQueue.peekFront()); // Will print 2
         System.out.println(myQueue.peekRear()); // Will print 7
-        System.out.println(myQueue.toString()); // Will print [2, 5, 3, 7]
+        System.out.println(myQueue); // Will print [2, 5, 3, 7]
     }
 }

src/main/java/com/thealgorithms/datastructures/trees/AVLSimple.java

@@ -49,8 +49,7 @@ public class AVLSimple {
 
     private Node insert(Node node, int item) {
         if (node == null) {
-            Node add = new Node(item);
-            return add;
+            return new Node(item);
         }
         if (node.data > item) {
             node.left = insert(node.left, item);

src/main/java/com/thealgorithms/datastructures/trees/AVLTree.java

@@ -62,22 +62,21 @@ public class AVLTree {
             }
             return;
         }
+        Node child;
         if (node.left != null) {
-            Node child = node.left;
+            child = node.left;
             while (child.right != null) {
                 child = child.right;
             }
-            node.key = child.key;
-            delete(child);
         } else {
-            Node child = node.right;
+            child = node.right;
             while (child.left != null) {
                 child = child.left;
             }
+        }
         node.key = child.key;
         delete(child);
     }
-    }
 
     public void delete(int delKey) {
         if (root == null) {
@@ -216,11 +215,7 @@ public class AVLTree {
 
     public boolean search(int key) {
         Node result = searchHelper(this.root, key);
-        if (result != null) {
-            return true;
-        }
-
-        return false;
+        return result != null;
     }
 
     private Node searchHelper(Node root, int key) {

src/main/java/com/thealgorithms/datastructures/trees/BinaryTree.java

@@ -117,11 +117,9 @@ public class BinaryTree {
             if (value < parent.data) {
                 parent.left = newNode;
                 parent.left.parent = parent;
-                return;
             } else {
                 parent.right = newNode;
                 parent.right.parent = parent;
-                return;
             }
         }
     }
@@ -177,7 +175,6 @@ public class BinaryTree {
             if (temp == root) {
                 successor.parent = null;
                 root = successor;
-                return true;
             } // If you're not deleting the root
             else {
                 successor.parent = temp.parent;
@@ -188,8 +185,8 @@ public class BinaryTree {
                 } else {
                     temp.parent.left = successor;
                 }
-                return true;
             }
+            return true;
         } // One child
         else {
             // If it has a right child
@@ -207,7 +204,6 @@ public class BinaryTree {
                 } else {
                     temp.parent.right = temp.right;
                 }
-                return true;
             } // If it has a left child
             else {
                 if (temp == root) {
@@ -223,8 +219,8 @@ public class BinaryTree {
                 } else {
                     temp.parent.right = temp.left;
                 }
-                return true;
             }
+            return true;
         }
     }
 

src/main/java/com/thealgorithms/datastructures/trees/GenericTree.java

@@ -168,7 +168,6 @@ public class GenericTree {
         for (int i = 0; i < node.child.size(); i++) {
             depth(node.child.get(i), dep - 1);
         }
-        return;
     }
 
     /**

src/main/java/com/thealgorithms/datastructures/trees/RedBlackBST.java

@@ -309,7 +309,6 @@ public class RedBlackBST {
 
     public void insertDemo() {
         Scanner scan = new Scanner(System.in);
-        while (true) {
         System.out.println("Add items");
 
         int item;
@@ -324,8 +323,6 @@ public class RedBlackBST {
         printTree(root);
         System.out.println("Pre order");
         printTreepre(root);
-            break;
-        }
         scan.close();
     }
 

src/main/java/com/thealgorithms/datastructures/trees/TrieImp.java

@@ -62,7 +62,7 @@ public class TrieImp {
             }
             currentNode = node;
         }
-        if (currentNode.end == true) {
+        if (currentNode.end) {
             currentNode.end = false;
             return true;
         }

src/main/java/com/thealgorithms/dynamicprogramming/BruteForceKnapsack.java

@@ -3,13 +3,6 @@ package com.thealgorithms.dynamicprogramming;
 /* A Naive recursive implementation
 of 0-1 Knapsack problem */
 public class BruteForceKnapsack {
-
-    // A utility function that returns
-    // maximum of two integers
-    static int max(int a, int b) {
-        return (a > b) ? a : b;
-    }
-
     // Returns the maximum value that
     // can be put in a knapsack of
     // capacity W
@@ -29,8 +22,7 @@ public class BruteForceKnapsack {
         // (1) nth item included
         // (2) not included
         else {
-            return max(
-                val[n - 1] + knapSack(W - wt[n - 1], wt, val, n - 1),
+            return Math.max(val[n - 1] + knapSack(W - wt[n - 1], wt, val, n - 1),
                 knapSack(W, wt, val, n - 1)
             );
         }

src/main/java/com/thealgorithms/dynamicprogramming/DyanamicProgrammingKnapsack.java

@@ -3,11 +3,6 @@ package com.thealgorithms.dynamicprogramming;
 // A Dynamic Programming based solution
 // for 0-1 Knapsack problem
 public class DyanamicProgrammingKnapsack {
-
-    static int max(int a, int b) {
-        return (a > b) ? a : b;
-    }
-
     // Returns the maximum value that can
     // be put in a knapsack of capacity W
     static int knapSack(int W, int wt[], int val[], int n) {
@@ -20,8 +15,7 @@ public class DyanamicProgrammingKnapsack {
                 if (i == 0 || w == 0) {
                     K[i][w] = 0;
                 } else if (wt[i - 1] <= w) {
-                    K[i][w] =
-                        max(val[i - 1] + K[i - 1][w - wt[i - 1]], K[i - 1][w]);
+                    K[i][w] = Math.max(val[i - 1] + K[i - 1][w - wt[i - 1]], K[i - 1][w]);
                 } else {
                     K[i][w] = K[i - 1][w];
                 }

src/main/java/com/thealgorithms/dynamicprogramming/EditDistance.java

@@ -57,8 +57,8 @@ public class EditDistance {
                     int insert = dp[i][j + 1] + 1;
                     int delete = dp[i + 1][j] + 1;
 
-                    int min = replace > insert ? insert : replace;
-                    min = delete > min ? min : delete;
+                    int min = Math.min(replace, insert);
+                    min = Math.min(delete, min);
                     dp[i + 1][j + 1] = min;
                 }
             }
@@ -110,13 +110,12 @@ public class EditDistance {
         if (s1.charAt(0) == s2.charAt(0)) {
             storage[m][n] =
                 editDistance(s1.substring(1), s2.substring(1), storage);
-            return storage[m][n];
         } else {
             int op1 = editDistance(s1, s2.substring(1), storage);
             int op2 = editDistance(s1.substring(1), s2, storage);
             int op3 = editDistance(s1.substring(1), s2.substring(1), storage);
             storage[m][n] = 1 + Math.min(op1, Math.min(op2, op3));
+        }
         return storage[m][n];
     }
 }
-}

src/main/java/com/thealgorithms/dynamicprogramming/LongestCommonSubsequence.java

@@ -30,10 +30,7 @@ class LongestCommonSubsequence {
                 if (arr1[i - 1].equals(arr2[j - 1])) {
                     lcsMatrix[i][j] = lcsMatrix[i - 1][j - 1] + 1;
                 } else {
-                    lcsMatrix[i][j] =
-                        lcsMatrix[i - 1][j] > lcsMatrix[i][j - 1]
-                            ? lcsMatrix[i - 1][j]
-                            : lcsMatrix[i][j - 1];
+                    lcsMatrix[i][j] = Math.max(lcsMatrix[i - 1][j], lcsMatrix[i][j - 1]);
                 }
             }
         }

src/main/java/com/thealgorithms/dynamicprogramming/LongestPalindromicSubstring.java

@@ -27,19 +27,9 @@ public class LongestPalindromicSubstring {
                 if (g == 0) {
                     arr[i][j] = true;
                 } else if (g == 1) {
-                    if (input.charAt(i) == input.charAt(j)) {
-                        arr[i][j] = true;
+                    arr[i][j] = input.charAt(i) == input.charAt(j);
                 } else {
-                        arr[i][j] = false;
-                    }
-                } else {
-                    if (
-                        input.charAt(i) == input.charAt(j) && arr[i + 1][j - 1]
-                    ) {
-                        arr[i][j] = true;
-                    } else {
-                        arr[i][j] = false;
-                    }
+                    arr[i][j] = input.charAt(i) == input.charAt(j) && arr[i + 1][j - 1];
                 }
 
                 if (arr[i][j]) {

src/main/java/com/thealgorithms/dynamicprogramming/MatrixChainMultiplication.java

@@ -87,7 +87,7 @@ public class MatrixChainMultiplication {
     private static void printArray(int[][] array) {
         for (int i = 1; i < size + 1; i++) {
             for (int j = 1; j < size + 1; j++) {
-                System.out.print(String.format("%7d", array[i][j]));
+                System.out.printf("%7d", array[i][j]);
             }
             System.out.println();
         }

src/main/java/com/thealgorithms/dynamicprogramming/PalindromicPartitioning.java

@@ -48,27 +48,21 @@ public class PalindromicPartitioning {
                 if (L == 2) {
                     isPalindrome[i][j] = (word.charAt(i) == word.charAt(j));
                 } else {
-                    if (
-                        (word.charAt(i) == word.charAt(j)) &&
-                        isPalindrome[i + 1][j - 1]
-                    ) {
-                        isPalindrome[i][j] = true;
-                    } else {
-                        isPalindrome[i][j] = false;
-                    }
+                    isPalindrome[i][j] = (word.charAt(i) == word.charAt(j)) &&
+                            isPalindrome[i + 1][j - 1];
                 }
             }
         }
 
         //We find the minimum for each index
         for (i = 0; i < len; i++) {
-            if (isPalindrome[0][i] == true) {
+            if (isPalindrome[0][i]) {
                 minCuts[i] = 0;
             } else {
                 minCuts[i] = Integer.MAX_VALUE;
                 for (j = 0; j < i; j++) {
                     if (
-                        isPalindrome[j + 1][i] == true &&
+                        isPalindrome[j + 1][i] &&
                         1 + minCuts[j] < minCuts[i]
                     ) {
                         minCuts[i] = 1 + minCuts[j];

src/main/java/com/thealgorithms/dynamicprogramming/RegexMatching.java

@@ -112,7 +112,7 @@ public class RegexMatching {
             return true;
         }
         if (strg[svidx][pvidx] != 0) {
-            return strg[svidx][pvidx] == 1 ? false : true;
+            return strg[svidx][pvidx] != 1;
         }
         char chs = src.charAt(svidx);
         char chp = pat.charAt(pvidx);
@@ -127,7 +127,7 @@ public class RegexMatching {
         } else {
             ans = false;
         }
-        strg[svidx][pvidx] = ans == false ? 1 : 2;
+        strg[svidx][pvidx] = ans ? 2 : 1;
         return ans;
     }
 

src/main/java/com/thealgorithms/dynamicprogramming/WineProblem.java

@@ -24,9 +24,7 @@ public class WineProblem {
         int start = WPRecursion(arr, si + 1, ei) + arr[si] * year;
         int end = WPRecursion(arr, si, ei - 1) + arr[ei] * year;
 
-        int ans = Math.max(start, end);
-
-        return ans;
+        return Math.max(start, end);
     }
 
     // Method 2: Top-Down DP(Memoization)

src/main/java/com/thealgorithms/maths/AmicableNumber.java

@@ -58,7 +58,7 @@ public class AmicableNumber {
             countofRes +
             " Amicable_numbers.These are \n "
         );
-        System.out.println(res.toString());
+        System.out.println(res);
     }
 
     /**

src/main/java/com/thealgorithms/maths/Combinations.java

@@ -52,8 +52,7 @@ public class Combinations {
         // nC0 is always 1
         long solution = 1;
         for (int i = 0; i < k; i++) {
-            long next = (n - i) * solution / (i + 1);
-            solution = next;
+            solution = (n - i) * solution / (i + 1);
         }
         return solution;
     }

src/main/java/com/thealgorithms/maths/DistanceFormula.java

@@ -10,8 +10,7 @@ public class DistanceFormula {
     ) {
         double dX = Math.pow(x2 - x1, 2);
         double dY = Math.pow(y2 - x1, 2);
-        double d = Math.sqrt(dX + dY);
-        return d;
+        return Math.sqrt(dX + dY);
     }
 
     public static double manhattanDistance(
@@ -20,8 +19,7 @@ public class DistanceFormula {
         double x2,
         double y2
     ) {
-        double d = Math.abs(x1 - x2) + Math.abs(y1 - y2);
-        return d;
+        return Math.abs(x1 - x2) + Math.abs(y1 - y2);
     }
 
     public static int hammingDistance(int[] b1, int[] b2) {

src/main/java/com/thealgorithms/maths/EulerMethod.java

@@ -26,22 +26,14 @@ public class EulerMethod {
         BiFunction<Double, Double, Double> exampleEquation1 = (x, y) -> x;
         ArrayList<double[]> points1 = eulerFull(0, 4, 0.1, 0, exampleEquation1);
         assert points1.get(points1.size() - 1)[1] == 7.800000000000003;
-        points1.forEach(point ->
-            System.out.println(
-                String.format("x: %1$f; y: %2$f", point[0], point[1])
-            )
-        );
+        points1.forEach(point -> System.out.printf("x: %1$f; y: %2$f%n", point[0], point[1]));
 
         // example from https://en.wikipedia.org/wiki/Euler_method
         System.out.println("\n\nexample 2:");
         BiFunction<Double, Double, Double> exampleEquation2 = (x, y) -> y;
         ArrayList<double[]> points2 = eulerFull(0, 4, 0.1, 1, exampleEquation2);
         assert points2.get(points2.size() - 1)[1] == 45.25925556817596;
-        points2.forEach(point ->
-            System.out.println(
-                String.format("x: %1$f; y: %2$f", point[0], point[1])
-            )
-        );
+        points2.forEach(point -> System.out.printf("x: %1$f; y: %2$f%n", point[0], point[1]));
 
         // example from https://www.geeksforgeeks.org/euler-method-solving-differential-equation/
         System.out.println("\n\nexample 3:");
@@ -55,11 +47,7 @@ public class EulerMethod {
             exampleEquation3
         );
         assert points3.get(points3.size() - 1)[1] == 1.1116729841674804;
-        points3.forEach(point ->
-            System.out.println(
-                String.format("x: %1$f; y: %2$f", point[0], point[1])
-            )
-        );
+        points3.forEach(point -> System.out.printf("x: %1$f; y: %2$f%n", point[0], point[1]));
     }
 
     /**
@@ -83,11 +71,7 @@ public class EulerMethod {
                 "stepSize should be greater than zero"
             );
         }
-        double yNext =
-            yCurrent +
-            stepSize *
-            differentialEquation.apply(xCurrent, yCurrent);
-        return yNext;
+        return yCurrent + stepSize * differentialEquation.apply(xCurrent, yCurrent);
     }
 
     /**

src/main/java/com/thealgorithms/maths/FastInverseSqrt.java

@@ -17,7 +17,7 @@ public class FastInverseSqrt {
         i = 0x5f3759df - (i >> 1);
         x = Float.intBitsToFloat(i);
         x = x * (1.5f - xhalf * x * x);
-        return x == (float) ((float) 1 / (float) Math.sqrt(number));
+        return x == ((float) 1 / (float) Math.sqrt(number));
     }
 
     /**

src/main/java/com/thealgorithms/maths/KrishnamurthyNumber.java

@@ -36,11 +36,7 @@ public class KrishnamurthyNumber {
             }
 
             //evaluating if sum of the factorials of the digits equals the number itself
-            if (tmp == s) {
-                return true;
-            } else {
-                return false;
-            }
+            return tmp == s;
         }
     }
 

src/main/java/com/thealgorithms/maths/StandardScore.java

@@ -3,7 +3,6 @@ package com.thealgorithms.maths;
 public class StandardScore {
 
     public static double zScore(double num, double mean, double stdDev) {
-        double z = (num - mean) / stdDev;
-        return z;
+        return (num - mean) / stdDev;
     }
 }

src/main/java/com/thealgorithms/others/BankersAlgorithm.java

@@ -88,7 +88,7 @@ public class BankersAlgorithm {
         while (count < totalProcess) {
             boolean foundSafeSystem = false;
             for (int m = 0; m < totalProcess; m++) {
-                if (finishProcesses[m] == false) {
+                if (!finishProcesses[m]) {
                     int j;
 
                     for (j = 0; j < totalResources; j++) {
@@ -112,7 +112,7 @@ public class BankersAlgorithm {
             }
 
             // If we could not find a next process in safe sequence.
-            if (foundSafeSystem == false) {
+            if (!foundSafeSystem) {
                 System.out.print(
                     "The system is not in the safe state because lack of resources"
                 );

src/main/java/com/thealgorithms/others/Dijkstra.java

@@ -131,15 +131,7 @@ class Graph {
             ) {
                 return false;
             }
-            if (
-                neighbours != null
-                    ? !neighbours.equals(vertex.neighbours)
-                    : vertex.neighbours != null
-            ) {
-                return false;
-            }
-
-            return true;
+            return neighbours != null ? neighbours.equals(vertex.neighbours) : vertex.neighbours == null;
         }
 
         @Override

src/main/java/com/thealgorithms/others/Implementing_auto_completing_features_using_trie.java

@@ -120,7 +120,7 @@ class Trieac {
         }
 
         // If prefix is present as a word.
-        boolean isWord = (pCrawl.isWordEnd == true);
+        boolean isWord = (pCrawl.isWordEnd);
 
         // If prefix is last node of tree (has no
         // children)

src/main/java/com/thealgorithms/others/LowestBasePalindrome.java

@@ -139,7 +139,7 @@ public class LowestBasePalindrome {
             // If the remainder is a digit < 10, simply add it to
             // the left side of the new number.
             if (decimalValue % b2 < 10) {
-                output = Integer.toString(decimalValue % b2) + output;
+                output = decimalValue % b2 + output;
             } // If the remainder is >= 10, add a character with the
             // corresponding value to the new number. (A = 10, B = 11, C = 12, ...)
             else {

src/main/java/com/thealgorithms/others/MiniMaxAlgorithm.java

@@ -46,7 +46,7 @@ public class MiniMaxAlgorithm {
             "The best score for " +
             (isMaximizer ? "Maximizer" : "Minimizer") +
             " is " +
-            String.valueOf(bestScore)
+                    bestScore
         );
     }
 
@@ -88,14 +88,12 @@ public class MiniMaxAlgorithm {
         // (1 x 2) = 2; ((1 x 2) + 1) = 3
         // (2 x 2) = 4; ((2 x 2) + 1) = 5 ...
         if (verbose) {
-            System.out.println(
-                String.format(
-                    "From %02d and %02d, %s chooses %02d",
+            System.out.printf(
+                    "From %02d and %02d, %s chooses %02d%n",
                     score1,
                     score2,
                     (isMaximizer ? "Maximizer" : "Minimizer"),
                     bestScore
-                )
             );
         }
 

src/main/java/com/thealgorithms/others/PageRank.java

@@ -49,7 +49,7 @@ class PageRank {
         for (k = 1; k <= totalNodes; k++) {
             this.pagerank[k] = InitialPageRank;
         }
-        System.out.printf("\n Initial PageRank Values , 0th Step \n");
+        System.out.print("\n Initial PageRank Values , 0th Step \n");
 
         for (k = 1; k <= totalNodes; k++) {
             System.out.printf(
@@ -113,7 +113,7 @@ class PageRank {
             }
 
             // Display PageRank
-            System.out.printf("\n Final Page Rank : \n");
+            System.out.print("\n Final Page Rank : \n");
             for (k = 1; k <= totalNodes; k++) {
                 System.out.printf(
                     " Page Rank of " + k + " is :\t" + this.pagerank[k] + "\n"

src/main/java/com/thealgorithms/others/RemoveDuplicateFromString.java

@@ -40,7 +40,7 @@ public class RemoveDuplicateFromString {
 
         for (int i = 0; i < n; i++) {
             if (sb.toString().indexOf(s.charAt(i)) == -1) {
-                sb.append(String.valueOf(s.charAt(i)));
+                sb.append(s.charAt(i));
             }
         }
 

src/main/java/com/thealgorithms/searches/BinarySearch.java

@@ -1,7 +1,5 @@
 package com.thealgorithms.searches;
 
-import static java.lang.String.format;
-
 import com.thealgorithms.devutils.searches.SearchAlgorithm;
 import java.util.Arrays;
 import java.util.Random;
@@ -86,23 +84,15 @@ class BinarySearch implements SearchAlgorithm {
         BinarySearch search = new BinarySearch();
         int atIndex = search.find(integers, shouldBeFound);
 
-        System.out.println(
-            format(
-                "Should be found: %d. Found %d at index %d. An array length %d",
+        System.out.printf(
+                "Should be found: %d. Found %d at index %d. An array length %d%n",
                 shouldBeFound,
                 integers[atIndex],
                 atIndex,
                 size
-            )
         );
 
         int toCheck = Arrays.binarySearch(integers, shouldBeFound);
-        System.out.println(
-            format(
-                "Found by system method at an index: %d. Is equal: %b",
-                toCheck,
-                toCheck == atIndex
-            )
-        );
+        System.out.printf("Found by system method at an index: %d. Is equal: %b%n", toCheck, toCheck == atIndex);
     }
 }

src/main/java/com/thealgorithms/searches/ExponentalSearch.java

@@ -1,7 +1,5 @@
 package com.thealgorithms.searches;
 
-import static java.lang.String.format;
-
 import com.thealgorithms.devutils.searches.SearchAlgorithm;
 import java.util.Arrays;
 import java.util.Random;
@@ -29,24 +27,16 @@ class ExponentialSearch implements SearchAlgorithm {
         ExponentialSearch search = new ExponentialSearch();
         int atIndex = search.find(integers, shouldBeFound);
 
-        System.out.println(
-            format(
-                "Should be found: %d. Found %d at index %d. An array length %d",
+        System.out.printf(
+                "Should be found: %d. Found %d at index %d. An array length %d%n",
                 shouldBeFound,
                 integers[atIndex],
                 atIndex,
                 size
-            )
         );
 
         int toCheck = Arrays.binarySearch(integers, shouldBeFound);
-        System.out.println(
-            format(
-                "Found by system method at an index: %d. Is equal: %b",
-                toCheck,
-                toCheck == atIndex
-            )
-        );
+        System.out.printf("Found by system method at an index: %d. Is equal: %b%n", toCheck, toCheck == atIndex);
     }
 
     @Override

src/main/java/com/thealgorithms/searches/InterpolationSearch.java

@@ -1,7 +1,5 @@
 package com.thealgorithms.searches;
 
-import static java.lang.String.format;
-
 import java.util.Arrays;
 import java.util.Random;
 import java.util.stream.IntStream;
@@ -67,28 +65,20 @@ class InterpolationSearch {
             .toArray();
 
         // the element that should be found
-        Integer shouldBeFound = integers[r.nextInt(size - 1)];
+        int shouldBeFound = integers[r.nextInt(size - 1)];
 
         InterpolationSearch search = new InterpolationSearch();
         int atIndex = search.find(integers, shouldBeFound);
 
-        System.out.println(
-            String.format(
-                "Should be found: %d. Found %d at index %d. An array length %d",
+        System.out.printf(
+                "Should be found: %d. Found %d at index %d. An array length %d%n",
                 shouldBeFound,
                 integers[atIndex],
                 atIndex,
                 size
-            )
         );
 
         int toCheck = Arrays.binarySearch(integers, shouldBeFound);
-        System.out.println(
-            format(
-                "Found by system method at an index: %d. Is equal: %b",
-                toCheck,
-                toCheck == atIndex
-            )
-        );
+        System.out.printf("Found by system method at an index: %d. Is equal: %b%n", toCheck, toCheck == atIndex);
     }
 }

src/main/java/com/thealgorithms/searches/IterativeBinarySearch.java

@@ -1,7 +1,5 @@
 package com.thealgorithms.searches;
 
-import static java.lang.String.format;
-
 import com.thealgorithms.devutils.searches.SearchAlgorithm;
 import java.util.Arrays;
 import java.util.Random;
@@ -72,23 +70,15 @@ public final class IterativeBinarySearch implements SearchAlgorithm {
         IterativeBinarySearch search = new IterativeBinarySearch();
         int atIndex = search.find(integers, shouldBeFound);
 
-        System.out.println(
-            String.format(
-                "Should be found: %d. Found %d at index %d. An array length %d",
+        System.out.printf(
+                "Should be found: %d. Found %d at index %d. An array length %d%n",
                 shouldBeFound,
                 integers[atIndex],
                 atIndex,
                 size
-            )
         );
 
         int toCheck = Arrays.binarySearch(integers, shouldBeFound);
-        System.out.println(
-            format(
-                "Found by system method at an index: %d. Is equal: %b",
-                toCheck,
-                toCheck == atIndex
-            )
-        );
+        System.out.printf("Found by system method at an index: %d. Is equal: %b%n", toCheck, toCheck == atIndex);
     }
 }

src/main/java/com/thealgorithms/searches/IterativeTernarySearch.java

@@ -1,7 +1,5 @@
 package com.thealgorithms.searches;
 
-import static java.lang.String.format;
-
 import com.thealgorithms.devutils.searches.SearchAlgorithm;
 import java.util.Arrays;
 import java.util.Random;
@@ -70,23 +68,15 @@ public class IterativeTernarySearch implements SearchAlgorithm {
         IterativeTernarySearch search = new IterativeTernarySearch();
         int atIndex = search.find(integers, shouldBeFound);
 
-        System.out.println(
-            format(
-                "Should be found: %d. Found %d at index %d. An array length %d",
+        System.out.printf(
+                "Should be found: %d. Found %d at index %d. An array length %d%n",
                 shouldBeFound,
                 integers[atIndex],
                 atIndex,
                 size
-            )
         );
 
         int toCheck = Arrays.binarySearch(integers, shouldBeFound);
-        System.out.println(
-            format(
-                "Found by system method at an index: %d. Is equal: %b",
-                toCheck,
-                toCheck == atIndex
-            )
-        );
+        System.out.printf("Found by system method at an index: %d. Is equal: %b%n", toCheck, toCheck == atIndex);
     }
 }

src/main/java/com/thealgorithms/searches/LinearSearch.java

@@ -53,14 +53,12 @@ public class LinearSearch implements SearchAlgorithm {
         LinearSearch search = new LinearSearch();
         int atIndex = search.find(integers, shouldBeFound);
 
-        System.out.println(
-            String.format(
-                "Should be found: %d. Found %d at index %d. An array length %d",
+        System.out.printf(
+                "Should be found: %d. Found %d at index %d. An array length %d%n",
                 shouldBeFound,
                 integers[atIndex],
                 atIndex,
                 size
-            )
         );
     }
 }

src/main/java/com/thealgorithms/searches/LowerBound.java

@@ -1,7 +1,5 @@
 package com.thealgorithms.searches;
 
-import static java.lang.String.format;
-
 import com.thealgorithms.devutils.searches.SearchAlgorithm;
 import java.util.Random;
 import java.util.concurrent.ThreadLocalRandom;
@@ -48,24 +46,16 @@ class LowerBound implements SearchAlgorithm {
         LowerBound search = new LowerBound();
         int atIndex = search.find(integers, val);
 
-        System.out.println(
-            format(
-                "Val: %d. Lower Bound Found %d at index %d. An array length %d",
+        System.out.printf(
+                "Val: %d. Lower Bound Found %d at index %d. An array length %d%n",
                 val,
                 integers[atIndex],
                 atIndex,
                 size
-            )
         );
 
         boolean toCheck = integers[atIndex] >= val || integers[size - 1] < val;
-        System.out.println(
-            format(
-                "Lower Bound found at an index: %d. Is greater or max element: %b",
-                atIndex,
-                toCheck
-            )
-        );
+        System.out.printf("Lower Bound found at an index: %d. Is greater or max element: %b%n", atIndex, toCheck);
     }
 
     /**

src/main/java/com/thealgorithms/searches/MonteCarloTreeSearch.java

@@ -187,13 +187,11 @@ public class MonteCarloTreeSearch {
         System.out.println("N.\tScore\t\tVisits");
 
         for (int i = 0; i < rootNode.childNodes.size(); i++) {
-            System.out.println(
-                String.format(
-                    "%02d\t%d\t\t%d",
+            System.out.printf(
+                    "%02d\t%d\t\t%d%n",
                     i + 1,
                     rootNode.childNodes.get(i).score,
                     rootNode.childNodes.get(i).visitCount
-                )
             );
         }
     }

src/main/java/com/thealgorithms/searches/TernarySearch.java

@@ -1,7 +1,5 @@
 package com.thealgorithms.searches;
 
-import static java.lang.String.format;
-
 import com.thealgorithms.devutils.searches.SearchAlgorithm;
 import java.util.Arrays;
 import java.util.Random;
@@ -89,23 +87,15 @@ public class TernarySearch implements SearchAlgorithm {
         TernarySearch search = new TernarySearch();
         int atIndex = search.find(integers, shouldBeFound);
 
-        System.out.println(
-            format(
-                "Should be found: %d. Found %d at index %d. An array length %d",
+        System.out.printf(
+                "Should be found: %d. Found %d at index %d. An array length %d%n",
                 shouldBeFound,
                 integers[atIndex],
                 atIndex,
                 size
-            )
         );
 
         int toCheck = Arrays.binarySearch(integers, shouldBeFound);
-        System.out.println(
-            format(
-                "Found by system method at an index: %d. Is equal: %b",
-                toCheck,
-                toCheck == atIndex
-            )
-        );
+        System.out.printf("Found by system method at an index: %d. Is equal: %b%n", toCheck, toCheck == atIndex);
     }
 }

src/main/java/com/thealgorithms/searches/UpperBound.java

@@ -1,7 +1,5 @@
 package com.thealgorithms.searches;
 
-import static java.lang.String.format;
-
 import com.thealgorithms.devutils.searches.SearchAlgorithm;
 import java.util.Random;
 import java.util.concurrent.ThreadLocalRandom;
@@ -48,24 +46,16 @@ class UpperBound implements SearchAlgorithm {
         UpperBound search = new UpperBound();
         int atIndex = search.find(integers, val);
 
-        System.out.println(
-            format(
-                "Val: %d. Upper Bound Found %d at index %d. An array length %d",
+        System.out.printf(
+                "Val: %d. Upper Bound Found %d at index %d. An array length %d%n",
                 val,
                 integers[atIndex],
                 atIndex,
                 size
-            )
         );
 
         boolean toCheck = integers[atIndex] > val || integers[size - 1] < val;
-        System.out.println(
-            format(
-                "Upper Bound found at an index: %d. Is greater or max element: %b",
-                atIndex,
-                toCheck
-            )
-        );
+        System.out.printf("Upper Bound found at an index: %d. Is greater or max element: %b%n", atIndex, toCheck);
     }
 
     /**

src/main/java/com/thealgorithms/sorts/BeadSort.java

@@ -27,7 +27,7 @@ public class BeadSort {
 
         for(int i = 0; i < unsorted.length; i++) {
             int k = 0;
-            for(int j = 0; j < (int) unsorted[i] ; j++) {
+            for(int j = 0; j < unsorted[i]; j++) {
                 grid[count[max - k - 1]++][k] = '*';
                 k++;
              }

src/main/java/com/thealgorithms/sorts/CircleSort.java

@@ -24,7 +24,7 @@ public class CircleSort implements SortAlgorithm {
         int left,
         int right
     ) {
-        Boolean swapped = false;
+        boolean swapped = false;
 
         if (left == right) {
             return false;

src/main/java/com/thealgorithms/sorts/CombSort.java

@@ -23,7 +23,7 @@ class CombSort implements SortAlgorithm {
     private int nextGap(int gap) {
         // Shrink gap by Shrink factor
         gap = (gap * 10) / 13;
-        return (gap < 1) ? 1 : gap;
+        return Math.max(gap, 1);
     }
 
     /**

src/main/java/com/thealgorithms/sorts/MergeSortRecursive.java

@@ -13,8 +13,7 @@ public class MergeSortRecursive {
     }
 
     public List<Integer> mergeSort() {
-        List<Integer> arrSorted = merge(arr);
-        return arrSorted;
+        return merge(arr);
     }
 
     private static List<Integer> merge(List<Integer> arr) {

src/main/java/com/thealgorithms/sorts/TreeSort.java

@@ -72,20 +72,20 @@ public class TreeSort implements SortAlgorithm {
         // ==== Integer Array =======
         System.out.println("Testing for Integer Array....");
         Integer[] a = { 3, -7, 45, 1, 343, -5, 2, 9 };
-        System.out.print(String.format("%-10s", "unsorted: "));
+        System.out.printf("%-10s", "unsorted: ");
         print(a);
         a = treeSort.sort(a);
-        System.out.print(String.format("%-10s", "sorted: "));
+        System.out.printf("%-10s", "sorted: ");
         print(a);
         System.out.println();
 
         // ==== Integer List =======
         System.out.println("Testing for Integer List....");
         List<Integer> intList = List.of(3, -7, 45, 1, 343, -5, 2, 9);
-        System.out.print(String.format("%-10s", "unsorted: "));
+        System.out.printf("%-10s", "unsorted: ");
         print(intList);
         intList = treeSort.sort(intList);
-        System.out.print(String.format("%-10s", "sorted: "));
+        System.out.printf("%-10s", "sorted: ");
         print(intList);
         System.out.println();
 
@@ -101,10 +101,10 @@ public class TreeSort implements SortAlgorithm {
             "apple",
             "pineapple",
         };
-        System.out.print(String.format("%-10s", "unsorted: "));
+        System.out.printf("%-10s", "unsorted: ");
         print(b);
         b = treeSort.sort(b);
-        System.out.print(String.format("%-10s", "sorted: "));
+        System.out.printf("%-10s", "sorted: ");
         print(b);
         System.out.println();
 
@@ -120,10 +120,10 @@ public class TreeSort implements SortAlgorithm {
             "apple",
             "pineapple"
         );
-        System.out.print(String.format("%-10s", "unsorted: "));
+        System.out.printf("%-10s", "unsorted: ");
         print(stringList);
         stringList = treeSort.sort(stringList);
-        System.out.print(String.format("%-10s", "sorted: "));
+        System.out.printf("%-10s", "sorted: ");
         print(stringList);
     }
 }

src/main/java/com/thealgorithms/sorts/WiggleSort.java

@@ -59,7 +59,7 @@ public class WiggleSort implements SortAlgorithm {
 
         median =
             select(
-                Arrays.<T>asList(sortThis),
+                Arrays.asList(sortThis),
                 (int) floor(sortThis.length / 2.0)
             );
 

src/main/java/com/thealgorithms/strings/LongestPalindromicSubstring.java

@@ -27,7 +27,7 @@ class Solution {
         String maxStr = "";
         for (int i = 0; i < n; ++i) {
             for (int j = i; j < n; ++j) {
-                if (isValid(s, i, j) == true) {
+                if (isValid(s, i, j)) {
                     if (j - i + 1 > maxStr.length()) { // update maxStr
                         maxStr = s.substring(i, j + 1);
                     }

src/main/java/com/thealgorithms/strings/MyAtoi.java

@@ -72,11 +72,6 @@ public static int myAtoi(String s) {
             if (db1 > (2147483647)) {
                 return 2147483647;
             }
-        }else if (number.length() == 10 && negative) {
-            double db1 = Double.parseDouble(number);
-            if (db1 >= 2147483648d) {
-                return -2147483648;
-            }
         }
 
     if(negative){