编写一个成绩分类程序

程序代码：

import javax.swing.JOptionPane;

public class TryCatchTest {

public static void main(String args[])

{

String grade;

grade=JOptionPane.showInputDialog("请输入学生成绩：");

int num=0;

try{

num=Integer.parseInt(grade);

}

catch(Exception e){

JOptionPane.showMessageDialog(null,"输入错误！请输入0-100之间的整数");

System.exit(0);

}

try

{

if(num<0||num>100)

throw new Exception();

if(num>=0||num<=100)

{

if(num<=100&&num>=90)

JOptionPane.showMessageDialog(null, "优");

if(num<90&&num>=80)

JOptionPane.showMessageDialog(null,"良");

if(num<80&&num>=70)

JOptionPane.showMessageDialog(null,"中");

if(num<70&&num>=60)

JOptionPane.showMessageDialog(null,"及格");

if(num<60)

JOptionPane.showMessageDialog(null,"不及格");

}

}

catch(Exception e){

JOptionPane.showMessageDialog(null,"超出范围！请输入1-100的整数");

}

}

}

2.程序运行结果