IF..else與switch語句記錄

import java.util.Scanner;

public class IfDemo03 {
    public static void main(String[] args) {
        //考試分數大於60就是及格，小於60分就不及格
        Scanner scanner = new Scanner(System.in);

        System.out.println("請輸入成績：");
        int score = scanner.nextInt();

        if (score==100){
            System.out.println("恭喜滿分");
        }else if (score<100 && score>=90){
            System.out.println("A級");
        }else if (score<90 && score>=80){
            System.out.println("B級");
        }else if (score<80 && score>=70){
            System.out.println("C級");
        }else if (score<70 && score>=60){
            System.out.println("D級");
        }else if (score<60 && score>=0){
            System.out.println("不及格");
        }else {
            System.out.println("成績不合法");
        }

        scanner.close();
    }
}
 

public class SwitchDemo01 {
    public static void main(String[] args) {
        //case穿透    //switch 匹配一個具體的值
        char grade = 'A';

        switch (grade){
            case 'A':
                System.out.println("優秀");
                break; //可選
            case 'B':
                System.out.println("良好");
                break; //可選
            case 'C':
                System.out.println("及格");
                break; //可選
            case 'D':
                System.out.println("再接再厲");
                break; //可選
            case 'E':
                System.out.println("掛科");
                break; //可選
            default:
                System.out.println("未知等級");
        }
    }
}
 

public class SwitchDemo02 {
    public static void main(String[] args) {
        String name = "啊盧";
        //JDK7的新特性，表示式結果可以是字串！！！
        //字元的本質還是數字

        //反編譯   java---class（位元組碼檔案）---反編譯（IDEA）

        switch (name){
            case "小盧":
                System.out.println("小盧");
                break;
            case "啊盧":
                System.out.println("啊盧");
                break;
            default:
                System.out.println("弄啥嘞！");
        }
    }
}