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Write a Program to implement stack in Java

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import java.io.*;
import java.util.Scanner;
public class MyStack
{
    private long[] StackArray;
    private int maxSize;
    private int top;
   
    MyStack(int s){
        maxSize=s;
        top=-1;
        StackArray = new long[maxSize];
    }
   
    public void push(long j){
        if(isFull()){
            System.out.println("Stack Is Full");
        }
        StackArray[++top]=j;
    }
   
    public void pop(){
        if(isEmpty()){
            System.out.println("Stack is Empty");
            return;
        }
        System.out.println(StackArray[top]);
        top=top-1;
    }
   
    public void peek(){
        if(isEmpty()){
            System.out.println("Stack is Empty");
            return;
        }
        System.out.println(StackArray[top]);
    }
   
    public boolean isEmpty(){
        if(top==-1)
            return true;
        else
            return false;
       
    }
   
    public boolean isFull(){
        return (top==maxSize-1);
    }
public static void main(String a[]) throws Exception
{
System.out.println("Welcome to the MyStack project!");
MyStack stack = new MyStack(10);
Scanner input = new Scanner(System.in);
int choice=0;
long element=0;
while(choice!=5){
   System.out.print("Enter your Choice \n 1. Push the element \n 2. pop the element 3. get the top element\n 5. To quit the program\n");
            choice = input.nextInt();
            System.out.println();
            switch(choice){
                case 1:
                    element= input.nextLong();
                    stack.push(element);
                    break;
                case 2:
                    stack.pop();
                    break;
                case 3:
                    stack.peek();
                    break;
                case 5:
                    System.exit(0);
                default:
                    System.out.println("Wrong Input ! Re-Enter!!");
            }    
}
}

}

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