JAVA - How To Use JOptionPane.showInputDialog In Java NetBeans

How To Use JOptionPane.showInputDialog In Java

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package JavaDB_001;
import javax.swing.*;

public class Project {

public static void main(String[] args){

String num1,num2;
int sum;
//get the first number fom showInputDialog
num1 = JOptionPane.showInputDialog("Enter The First Number");
//get the Seconde number fom showInputDialog
num2 = JOptionPane.showInputDialog("Enter The Seconde Number");

//verify the inout is not null
if(num1 == null){
num1 = "0";
}
if(num2 == null){
num2 = "0";
}

sum = Integer.parseInt(num1) + Integer.parseInt(num2);

JOptionPane.showMessageDialog(null, "The Sum Of this Two Number Is: "+sum);
System.exit(0);
}
}

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