Day2021020405

package com.icebear.struct;
import java.util.Scanner;
public class SwitchChooseStruct {
    public static void main(String[] args) {
        //Scanner scanner=new Scanner(System.in);
        //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;//break可选
            case 'B':
                System.out.println("良好");break;
            case 'C':
                System.out.println("及格");break;
            case 'D':
                System.out.println("再接再厉");break;
            case 'E':
                System.out.println("挂科警告");break;
            default:
                System.out.println("未知等级");
        }
    }
}

package com.icebear.struct;
public class SwitchChooseStruct02 {
    public static void main(String[] args) {
        String name ="中州侍女";
        //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
        switch (name){
            case "大白熊":
                System.out.println("大白熊");break;
            case "吴天鹏" :
                System.out.println("吴天鹏");break;
            default:
                System.out.println("无数据");
        }
    }
}

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//
package com.icebear.struct;
public class SwitchChooseStruct02 {
    public SwitchChooseStruct02() {
    }
    public static void main(String[] args) {
        String name = "中州侍女";
        byte var3 = -1;
        switch(name.hashCode()) {
        case 21463418:
            if (name.equals("吴天鹏")) {
                var3 = 1;
            }
            break;
        case 22902292:
            if (name.equals("大白熊")) {
                var3 = 0;
            }
        }
        switch(var3) {
        case 0:
            System.out.println("大白熊");
            break;
        case 1:
            System.out.println("吴天鹏");
            break;
        default:
            System.out.println("无数据");
        }
    }
}