3. switch语句

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mob604756fe7577 2021-10-06 22:09:00

文章标签 switch语句 java string类新特性字符串 文章分类 代码人生

switch 语句

1.简单switch语句

package com.lin.study.switchyuju;

public class SwitchDemo01 {
    public static void main(String[] args) {
        //case穿透    //switch:匹配一个具体的值
        char grade = 'F';

        switch(grade){
            case 'A':
                System.out.println("优秀");break;
            case 'B':
                System.out.println("良好");break;
            case 'C':
                System.out.println("及格");break;
            case 'D':
                System.out.println("不及格");break;
            default:
                System.out.println("输入错误！");

        }
    }
}

运行结果:
输入错误！
Process finished with exit code 0

2.String类型switch语句

package com.lin.study.switchyuju;

import java.util.Scanner;

public class SwitchDemo02 {
    public static void main(String[] args) {
        //JDK7的新特性，表达式可以是字符串！！！
        Scanner scanner = new Scanner(System.in);

        System.out.println("请输入姓名: ");
        String name = scanner.next();

        switch(name){
            case "秦疆":
                System.out.println("我是秦疆！");break;
            case "狂神":
                System.out.println("我是狂神！");break;
            default:
                System.out.println("啥也不是！");
        }

        //关闭流
        scanner.close();
    }
}