Java program to implement stack and its operation

Java Program to implement the Stack using array.

import java.util.*;
class Stack
{
    int stack[]=new int[10];
    int top=-1;
    void push(int num)
    {
        if(top>=9)
        {
            System.out.println("Stack is OverFlow");
        }
        else
        {
            top++;
            stack[top]=num;
        }
    }
    void pop()
    {
        if(top==-1)
        {
            System.out.println("Stack is Empty");
        }
        else
        {
            System.out.println("Poped Element is "+stack[top]);
            top--;
        }
    }
    public static void main(String arr[])
    {
        Stack obj=new Stack();
        Scanner sc=new Scanner(System.in);
        int ch,n;
        do
        {
            System.out.println("1.Push\n2.Pop\n0.Exit\nEnter any Choice :");
            ch=sc.nextInt();
            switch(ch)
            {
                case 1:
                    System.out.println("Enter the Data Item : ");
                    n=sc.nextInt();
                    obj.push(n);
                break;
                case 2:
                    obj.pop();
                break;
                case 0:
                    System.exit(0);
                break;
                default:
                    System.out.println("Invalid Choice ");
            }
            
        }while(ch!=0);
    }
}

1.Push

2.Pop

0.Exit

Enter any Choice :

1

Enter the Data Item : 

34

1.Push

2.Pop

0.Exit

Enter any Choice :

1

Enter the Data Item : 

56

1.Push

2.Pop

0.Exit

Enter any Choice :

1

Enter the Data Item : 

44

1.Push

2.Pop

0.Exit

Enter any Choice :

2

Poped Element is 44

1.Push

2.Pop

0.Exit

Enter any Choice :

2

Poped Element is 56

1.Push

2.Pop

0.Exit

Enter any Choice :

2

Poped Element is 34

1.Push

2.Pop

0.Exit

Enter any Choice :

2

Stack is Empty

1.Push

2.Pop

0.Exit

Enter any Choice :

2

Stack is Empty

1.Push

2.Pop

0.Exit

Enter any Choice :

1

Enter the Data Item : 

40

1.Push

2.Pop

0.Exit

Enter any Choice :

1

Enter the Data Item : 

60

1.Push

2.Pop

0.Exit

Enter any Choice :