Java課後作業——異常處理

package cn.edu.bit.cs;

import java.util.Scanner;

public class JudgeGrade {
    public static void main(String[] args)
    {
    	Scanner in=new Scanner(System.in);
    	try 
    	{
    		int grade=in.nextInt();
    		if(grade>0&&grade<60)
    		{
    			System.out.println("不及格");
    		}
    		else if(grade>=60&&grade<70)
    		{
    			System.out.println("及格");
    		}
    		else if(grade>=70&&grade<80)
    		{
    			System.out.println("中");
    		}
    		else if(grade>=80&&grade<90)
    		{
    			System.out.println("良");
    		}
    		else if(grade>=90&&grade<=100)
    		{
    			System.out.println("優");
    		}
    		else 
    		{
    			throw new Exception();
    		}
    	}
    	catch (Exception e)
    	{
    		System.out.println("輸入錯誤");
    	}
    }
}

           

1、Java輸入輸出，利用scanner類處理，system.in處理相應的輸入

2、異常處理的基本文法注意，try-catch語句，同時注意還有finally語句