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simple_stack.java

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import java.util.EmptyStackException;

class simple_stack {

private int maxSize;

private int[] stackArray;

private int top;

public simple_stack(int size) {

maxSize = size;

stackArray = new int[maxSize];

top = -1;

}

public void push(int value) {

if (top == maxSize - 1) {

System.out.println("Stack is full");

return;

}

stackArray[++top] = value;

}

public int pop() {

if (top == -1) {

throw new EmptyStackException();

}

return stackArray[top--];

}

public int peek() {

if (top == -1) {

throw new EmptyStackException();

}

return stackArray[top];

}

public boolean isEmpty() {

return (top == -1);

}

public static void main(String[] args) {

simple_stack myStack = new simple_stack(5);

myStack.push(10);

myStack.push(20);

myStack.push(30);

System.out.println(myStack.pop());

System.out.println(myStack.peek());

}

}