java流程控制05Switch选择结构

Posted 2021-06-09 Leo

package com.Leo.struct;

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

        switch (grade){
            case \'A\':
                System.out.println("优秀");
                break;//可选
            case \'B\':
                System.out.println("良好");
                break;
            case \'D\':
                System.out.println("再接再厉");
                break;
            case \'E\':
                System.out.println("挂科");
                break;
            default:
                System.out.println("未知等级");

        }
    }

}

package com.Leo.struct;

public class SwitchDemo02 {
    public static void main(String[] args) {
        String name = "Leo";
        //JDK7的新特性，表达式结果可以是字符串!!!
        //字符的本质还是数字

        //反编译   java---class(字节码文件）---反编译（IDEA）

        switch (name){
            case "Leo":
                System.out.println("leo");
                break;
            case "yuan":
                System.out.println("yuan");
                break;
            default:
                System.out.println("弄啥嘞！");
        }
    }
}