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Abhinandan Padmakar Pandey 2021-10-08 22:02:34 +05:30 committed by GitHub
parent 4a8357651d
commit 9b38ecdfa6
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3 changed files with 18 additions and 18 deletions

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@ -5,17 +5,17 @@ import java.util.ArrayList;
/** /**
* This class implements a GenericArrayListQueue. * This class implements a GenericArrayListQueue.
* *
* <p>A GenericArrayListQueue data structure functions the same as any specific-typed queue. The * A GenericArrayListQueue data structure functions the same as any specific-typed queue. The
* GenericArrayListQueue holds elemets of types to-be-specified at runtime. The elements that are * GenericArrayListQueue holds elements of types to-be-specified at runtime. The elements that are
* added first are the first to be removed (FIFO) New elements are added to the back/rear of the * added first are the first to be removed (FIFO). New elements are added to the back/rear of the
* queue. * queue.
*/ */
public class GenericArrayListQueue<T> { public class GenericArrayListQueue<T> {
/** The generic ArrayList for the queue T is the generic element */ /** The generic ArrayList for the queue T is the generic element */
ArrayList<T> _queue = new ArrayList<T>(); ArrayList<T> _queue = new ArrayList<>();
/** /**
* Checks if the queue has elements (not empty) * Checks if the queue has elements (not empty).
* *
* @return True if the queue has elements. False otherwise. * @return True if the queue has elements. False otherwise.
*/ */
@ -24,7 +24,7 @@ public class GenericArrayListQueue<T> {
} }
/** /**
* Checks what's at the front of the queue * Checks what's at the front of the queue.
* *
* @return If queue is not empty, element at the front of the queue. Otherwise, null * @return If queue is not empty, element at the front of the queue. Otherwise, null
*/ */
@ -51,7 +51,7 @@ public class GenericArrayListQueue<T> {
* *
* @return If queue is not empty, element retrieved. Otherwise, null * @return If queue is not empty, element retrieved. Otherwise, null
*/ */
public T poll() { public T pull() {
T result = null; T result = null;
if (this.hasElements()) { if (this.hasElements()) {
result = _queue.remove(0); result = _queue.remove(0);
@ -65,19 +65,19 @@ public class GenericArrayListQueue<T> {
* @param args Command line arguments * @param args Command line arguments
*/ */
public static void main(String[] args) { public static void main(String[] args) {
GenericArrayListQueue<Integer> queue = new GenericArrayListQueue<Integer>(); GenericArrayListQueue<Integer> queue = new GenericArrayListQueue<>();
System.out.println("Running..."); System.out.println("Running...");
assert queue.peek() == null; assert queue.peek() == null;
assert queue.poll() == null; assert queue.pull() == null;
assert queue.add(1) == true; assert queue.add(1);
assert queue.peek() == 1; assert queue.peek() == 1;
assert queue.add(2) == true; assert queue.add(2);
assert queue.peek() == 1; assert queue.peek() == 1;
assert queue.poll() == 1; assert queue.pull() == 1;
assert queue.peek() == 2; assert queue.peek() == 2;
assert queue.poll() == 2; assert queue.pull() == 2;
assert queue.peek() == null; assert queue.peek() == null;
assert queue.poll() == null; assert queue.pull() == null;
System.out.println("Finished."); System.out.println("Finished.");
} }
} }

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@ -38,7 +38,7 @@ public class LinkedQueue {
/** /**
* Check if queue is empty * Check if queue is empty
* *
* @return <tt>true</tt> if queue is empty, otherwise <tt>false</tt> * @return true if queue is empty, otherwise false
*/ */
public boolean isEmpty() { public boolean isEmpty() {
return size == 0; return size == 0;
@ -48,7 +48,7 @@ public class LinkedQueue {
* Add element to rear of queue * Add element to rear of queue
* *
* @param data insert value * @param data insert value
* @return <tt>true</tt> if add successfully * @return true if add successfully
*/ */
public boolean enqueue(int data) { public boolean enqueue(int data) {
Node newNode = new Node(data); Node newNode = new Node(data);

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@ -3,7 +3,7 @@ package DataStructures.Queues;
/** /**
* This implements Queues by using the class Queue. * This implements Queues by using the class Queue.
* *
* <p>A queue data structure functions the same as a real world queue. The elements that are added * A queue data structure functions the same as a real world queue. The elements that are added
* first are the first to be removed. New elements are added to the back/rear of the queue. * first are the first to be removed. New elements are added to the back/rear of the queue.
*/ */
class Queue { class Queue {
@ -153,7 +153,7 @@ public class Queues {
myQueue.remove(); // Will make 2 the new front, making 10 no longer part of the queue myQueue.remove(); // Will make 2 the new front, making 10 no longer part of the queue
// [10, 2(front), 5, 3(rear)] // [10, 2(front), 5, 3(rear)]
myQueue.insert(7); // Insert 7 at the rear which will be index 0 because of wrap around myQueue.insert(7); // Insert 7 at the rear which will get 0 index because of wrap around
// [7(rear), 2(front), 5, 3] // [7(rear), 2(front), 5, 3]
System.out.println(myQueue.peekFront()); // Will print 2 System.out.println(myQueue.peekFront()); // Will print 2