if选择结构

package struct;

import java.util.Scanner;

public class One {
    public static void main(String[] args) {
        //if单选结构
        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 struct;

import java.util.Scanner;

public class Two {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你的分数:");
        int score = scanner.nextInt();
        if (score>60){
            System.out.println("少一分浪费，多一分受罪");
        }
        else {
            System.out.println("喜提补考");
        }
        scanner.close();

    }
}

package struct;

import java.util.Scanner;

public class more {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你的分数:");
        int score = scanner.nextInt();
        if (score==100){
            System.out.println("恭喜满分");
        } else if (score>90 && score<100) {
            System.out.println("优秀");
        } else if (score>60 && score<=90) {
            System.out.println("合格");
        } else if (score<60 && score>=0) {
            System.out.println("喜提补考");
        }
        else {
            System.out.println("成绩不合法");
    }
}
}