StackUsingArray.java

// Write a Program to implement stack operations using arrays. 

class Stack_2{
    private int arr[];
    private int top;
    private int capacity;

    Stack_2(int size) {
      arr = new int[size];
      capacity = size;
      top = -1;
    }
    
   public void push(int x) {
      if (isFull()) {
        System.out.println("OverFlow\nProgram Terminated\n");
        System.exit(1);
      }
  
      System.out.println("Inserting " + x);
      arr[++top] = x;
    }
    public int pop() {
      if (isEmpty()) {
        System.out.println("STACK EMPTY");
        System.exit(1);
      }
      return arr[top--];
    }
    
    public int size() {
      return top + 1;
    }

    public Boolean isEmpty() {
      return top == -1;
    }

    public Boolean isFull() {
      return top == capacity - 1;
    }
  
    public void printStack() {
      for (int i = 0; i <= top; i++) {
        System.out.println(arr[i]);
      }
    }
    
    public static void main(String[] args) {
      Stack_2 stack = new Stack_2(5);
  
      stack.push(1);
      stack.push(2);
      stack.push(3);
      stack.push(4);
  
      stack.pop();
      System.out.println("\nAfter popping out");
  
      stack.printStack();
  
    }
  }