Hi Friend,

Try the following code:

import java.lang.*;
import java.io.*;
import java.util.*;
interface MyInterface{
int n=20;
public void pop();
public void push();
public void peek();
public void display();
}
class StackImplementation implements MyInterface{
int arr[]=new int[n];
int top=-1;
public void push(){
try{
DataInputStream dis=new DataInputStream(System.in);
System.out.println("Enter Element");
int ele=Integer.parseInt(dis.readLine());
arr[++top]=ele;
}
catch(Exception e){
System.out.println("e");
}
}
public void pop(){
int popper=arr[top];
top--;
System.out.println("popped element " +popper);
}

public void peek(){
int popper=arr[top];
System.out.println("popped element " +popper);
}
public void display(){
if(top<0){
System.out.println("Stack is empty");
return;
}
else{
String str=" ";
for(int i=0;i<=top;i++)
str=str+" "+arr[i];
System.out.println("Elements are "+str);
}
}
}
class StackADT{
public static void main(String arg[])throws IOException{
DataInputStream dis=new DataInputStream(System.in);
StackImplementation stk=new StackImplementation();
int menu=0;
do{
System.out.println("1.push \n2.pop \n3.peek \n4.display \n5.Exit");
System.out.println();
System.out.print("Enter your choice: ");
menu=Integer.parseInt(dis.readLine());
switch(menu){
case 1:stk.push();
break;
case 2:stk.pop();
break;
case 3:stk.peek();
break;
case 4:stk.display();
break;
case 5:System.exit(0);
}
}while(menu<=5);
System.out.println();
}
}

Hope that it will be helpful for you.
Thanks