If语句

if语句

以下为if语句的使用格式方法

package jie.structure;

import java.util.Scanner;

public class Demo01 {
    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 jie.structure;

import java.util.Scanner;

public class Demo02 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.println("请输出您的成绩：");
        int score = scanner.nextInt();

        if (score>=60){
            System.out.println("及格");
        }else {
            System.out.println("不及格");
        }



        scanner.close();
    }
}

package jie.structure;

import java.util.Scanner;

public class Demo03 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.println("请输入您的成绩：");
        int score = scanner.nextInt();

        if (score==100){
            System.out.println("恭喜满分！");
        }else if (score<100 && score>=80){
            System.out.println("优秀");
        }else if (score<80 && score>=60){
            System.out.println("及格");
        }else if (score<60 && score>=0){
            System.out.println("不及格");
        }else {
            System.out.println("成绩不合法");
        }

        scanner.close();
    }
}