JAVASE If 单选择、双选择及镶嵌笔记

//单选
package com.huang.boke.flowPath;

import java.util.Scanner;

public class test02 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入内容");

        String s = scanner.nextLine();
        //equals：判断字符串是否相等
        if (s.equals("hello")) {
            System.out.println(s);

        }
        System.out.println("end");

        scanner.close();

    }
}

package com.huang.boke.flowPath;

import java.util.Scanner;

public class IfTest {
    //判断是否及格
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("输入成绩");
        int score = scanner.nextInt();
        if (score>=60){
            System.out.println("及格");

        }
        else {
            System.out.println("不及格");
        }

        scanner.close();

    }
}
//镶嵌

package com.huang.boke.flowPath;

import java.util.Scanner;

public class IfDome {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("输入成绩");
        int score = scanner.nextInt();
        if (score==100){
            System.out.println("s级");
        }else if (score>=80 && score<=99){
            System.out.println("a级");
        }else if (score>=60 && score<=79){
            System.out.println("b级");
        }else if (score<60 && score>=0) {
            System.out.println("c级");
        }else {
            System.out.println("无效");
        }

        scanner.close();
    }
}