Update Stack.java

Format code

src/main/java/com/dataStructures/Stack.java

@@ -6,14 +6,14 @@ import java.util.EmptyStackException;
 public class Stack<E> implements Serializable {
 
     /**
-     * Inital capacity alloted to stack on object creation
+     * Initial capacity allocated to stack on object creation
      */
     private final int INITIAL_CAPACITY = 10;
 
     /**
      * Increment in memory space once stack is out of space
      */
-    private final int EXNTEDED_CAPACITY = 10;
+    private final int EXTENDED_CAPACITY = 10;
 
 
     /**
@@ -30,15 +30,14 @@ public class Stack<E>  implements Serializable {
 
     /**
      * Uninitialized array to hold stack elements.
-     * WIll be intialized with inital capacity once the object is created
+     * WIll be initialized with initial capacity once the object is created
      */
     private Object[] elements;
 
     /**
-     * No argument to create stack object with inital capacity
+     * No argument to create stack object with initial capacity
      */
     public Stack() {
-
         elements = new Object[INITIAL_CAPACITY];
     }
 
@@ -47,16 +46,7 @@ public class Stack<E>  implements Serializable {
      */
 
     public boolean empty() {
-
-        if(null == elements) {
-            return true;
-        }
-
-        if(size == 0){
-            return true;
-        }
-
-        return false;
+        return elements == null || size == 0;
     }
 
 
@@ -65,7 +55,6 @@ public class Stack<E>  implements Serializable {
      */
 
     public Object peek() {
-
         if (empty()) {
             throw new EmptyStackException();
         }
@@ -78,7 +67,6 @@ public class Stack<E>  implements Serializable {
      */
 
     public Object pop() {
-
         if (empty()) {
             throw new EmptyStackException();
         }
@@ -99,7 +87,7 @@ public class Stack<E>  implements Serializable {
             tail++;
             elements[tail] = e;
         } else {
-            Object[] extendedElements = new Object[INITIAL_CAPACITY + EXNTEDED_CAPACITY];
+            Object[] extendedElements = new Object[INITIAL_CAPACITY + EXTENDED_CAPACITY];
             System.arraycopy(elements, 0, extendedElements, 0, (tail + 1));
             elements = extendedElements;
             tail++;
@@ -143,5 +131,4 @@ public class Stack<E>  implements Serializable {
     public int size() {
         return size;
     }
-
 }