If语句

package scanner;

import java.util.Scanner;

public class IfDemo01 {
    public static void main(String[] args) {
        Scanner scanner=new Scanner;
        System.out.println(“请输入内容：”);
        String s= scanner.nextLine();
        //equals:判断字符是否相等
        if (s.equals("Hello!")){
            System.out.println(s);
        }
        System.out.println("End!");
        scanner.close();
        
        
    }
}

package scanner;

import java.util.Scanner;

public class IfDemo02 {
    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);
        System.out.println("请输入成绩:");
        int score= scanner.nextInt();
        if (score==100){
            System.out.println("恭喜满分!");
        }else if(score<=100 && score>=90){
            System.out.println("A");
        }else if(score<=90 && score>=80){
            System.out.println("B");
        }else if(score<=80 && score>=70){
            System.out.println("C");
        }else if(score<=70 && score>=60){
            System.out.println("D");
        }else if(score<=60 && score>=0){
            System.out.println("不及格");
        }else {
            System.out.println("该成绩不合法");



        }

    }
}