switch结构

package com.struct;

public class SwitchDemo01  {
    public static void main(String[] args) {
        char grade = 'C';

        //switch 匹配一个具体的值
        switch (grade){
            case 'A':
                System.out.println("优秀");
                break;//可选，没有break会造成case穿透
            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");
                break;

        }
    }
}
package com.struct;

public class SwitchDemo02 {
    public static void main(String[] args) {
        String name = "小伙";
        //JDK7的新特性，表达式的结果可以说字符串！！！
        //字符的本质还是数子
        switch (name){
            case "小明":
                System.out.println("小明");//反编译，底层hashcode
                break;
            case "小伙":
                System.out.println("小伙");
                break;
            default:
                System.out.println("弄啥嘞！");
        }
    }
}