详解Java中的三种流程控制语句

public class User {
    public static void main(String[] args) {
        String name = "hacker";
        int age = 18;
        String happy = "学习Java";
        System.out.println("姓名:"+name);
        System.out.println("年龄:"+age);
        System.out.println("爱好:"+happy);
    }
}

import java.util.Scanner;

public class User {
    public static void main(String[] args) {
        var sc = new Scanner(System.in);
        System.out.print("请输入成绩:");
        float score = sc.nextFloat();
        if(score>=60){//如果成绩>=60,成绩及格
            System.out.printf("成绩及格:%3.1f", score);
        }
        else {//否则成绩不及格
            System.out.printf("成绩不及格:%3.1f",  score);
        }
    }
}

import java.util.Scanner;

public class User {
    public static void main(String[] args) {
        var sc = new Scanner(System.in);//
        System.out.print("请输入成绩:");
        float score = sc.nextFloat();
        if(score<60){//如果成绩<60,成绩不及格
            System.out.printf("成绩不及格:%3.1f", score);
        }else if(score>=60&&score<90){//如果60<=score<90,成绩及格
            System.out.printf("成绩及格:%3.1f", score);
        }
        else {//否则成绩优秀
            System.out.printf("成绩优秀:%3.1f",  score);
        }
    }
}

import java.util.Scanner;

public class User {
    public static void main(String[] args) {
        var sc = new Scanner(System.in);
        System.out.print("输入1,2,3中其一数字:");
        int number = sc.nextInt();
        switch(number) {
            case 1:
                System.out.print("hello");
                break;
            case 2:
                System.out.print("Java");
                break;
            case 3:
                System.out.print("world");
            default:
                System.out.print("输入有误，请重新输入");
        }
    }
}

public class User {
    public static void main(String[] args) {
        for (int i = 1; i <= 10; i++) {
            System.out.println(i);
        }
    }
}

public class User {
    public static void main(String[] args) {
        int[] a = {1, 2, 3, 4, 5, 6};
        for (int i : a) {
            System.out.println(i);
        }
    }
}

public class User {
    public static void main(String[] args) {
        int i = 0;
        while (i < 10) {
            i++;
            System.out.println(i);
        }
    }
}

public class User {
    public static void main(String[] args) {
        int i = 0;
        do {//先执行循环体，即使i++不满足条件也会执行
            i++;
            System.out.print(i);
        } while (i < 0);
    }
}

public class User {
    public static void main(String[] args) {
        for (int i = 0;i <= 10;i++){
            if( i == 2){
                break; //break当i=2时直接终止循环
            }
            System.out.println(i);
        }
    }
}

public class User {
    public static void main(String[] args) {
        for (int i = 0;i <= 10;i++){
            if( i == 2){
                continue; //continue当i=2时跳出本次循环，进入下一次循环(不打印2)
            }
            System.out.println(i);
        }
    }
}