这是一个非常简单的整数加法计算器程序，希望大家给些意见。

import javax.swing.joptionpane;

public class addition {

public static void main (string args[]) {

string firstnum, secondnum;

int num1, num2, sum;

firstnum = joptionpane.showinputdialog

("enter first integer");

secondnum = joptionpane.showinputdialog

("enter secong integet");

num1 = integer.parseint(firstnum);

num2 = integer.parseint(secondnum);

sum = num1 + num2;

joptionpane.showmessagedialog(

null,"the sum is "+ sum,

"results",joptionpane.information_message);

system.exit(0);

} }