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https://github.com/TheAlgorithms/Java.git
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@ -8,32 +8,31 @@ package DataStructures.Stacks;
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* of an array implementation of a Stack. So an element can only be added/removed
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* from the end of the array. In theory stack have no fixed size, but with an
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* array implementation it does.
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*
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* @author Unknown
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*/
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public class StackArray {
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/**
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* Main method
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*
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* @param args Command line arguments
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* Driver Code
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*/
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public static void main(String[] args) {
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// Declare a stack of maximum size 4
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StackArray myStackArray = new StackArray(4);
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assert myStackArray.isEmpty();
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assert !myStackArray.isFull();
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// Populate the stack
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myStackArray.push(5);
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myStackArray.push(8);
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myStackArray.push(2);
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myStackArray.push(9);
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System.out.println("*********************Stack Array Implementation*********************");
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System.out.println(myStackArray.isEmpty()); // will print false
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System.out.println(myStackArray.isFull()); // will print true
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System.out.println(myStackArray.peek()); // will print 9
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System.out.println(myStackArray.pop()); // will print 9
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System.out.println(myStackArray.peek()); // will print 2
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assert !myStackArray.isEmpty();
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assert myStackArray.isFull();
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assert myStackArray.peek() == 9;
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assert myStackArray.pop() == 9;
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assert myStackArray.peek() == 2;
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assert myStackArray.size() == 3;
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}
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/**
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@ -62,7 +61,7 @@ public class StackArray {
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public StackArray() {
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this(DEFAULT_CAPACITY);
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}
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/**
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* Constructor
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*
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@ -162,4 +161,13 @@ public class StackArray {
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public void makeEmpty() { // Doesn't delete elements in the array but if you call
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top = -1; // push method after calling makeEmpty it will overwrite previous values
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}
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/**
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* Return size of stack
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*
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* @return size of stack
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*/
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public int size() {
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return top + 1;
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}
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}
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