JAVA 加减乘除

package homework;
import  javax.swing.JOptionPane;
public class suanshu {
    public static void main(String agrs[])
    {
        String firstNumber,secondNumber;//定义变量-两个字符串，用于输入数字
        int number1,number2;//定义变量-数字
        //从屏幕上输入两个数字（字符格式）
        firstNumber=JOptionPane.showInputDialog("请输入第一个数字");
        secondNumber=JOptionPane.showInputDialog("请输入第二个数字");
        //将字符串转换为数字
        number1=Integer.parseInt(firstNumber);
        number2=Integer.parseInt(secondNumber);
        //加减乘除
        int jia,jian,cheng,chu;
        jia=number1+number2;
        jian=number1-number2;
        cheng=number1*number2;
        chu=number1/number2;
        JOptionPane.showMessageDialog(null,"和为"+jia+"\n"+"差为"+jian+"\n"+"积为"+cheng+"\n"+"商为"+chu,"答案",JOptionPane.PLAIN_MESSAGE);
        //退出
        System.exit(0);    
    }

}