Java学习 day15-17打卡

[令狐冲冲冲]

 USB接口案例

package day15;

/**
 * @author xpl
 * @create 2023-02-23 15:47
 */
public interface USB {
    public abstract void open();
    public abstract void close();
}


package day15;

/**
 * @author xpl
 * @create 2023-02-23 15:52
 */
public class Mouse implements USB {

    @Override
    public void open() {
        System.out.println("打开鼠标");
    }

    @Override
    public void close() {
        System.out.println("关闭鼠标");
    }

    public void click() {
        System.out.println("鼠标点击");
    }
}


package day15;

/**
 * @author xpl
 * @create 2023-02-23 15:52
 */
public class Keyboard implements USB {

    @Override
    public void open() {
        System.out.println("打开键盘");
    }

    @Override
    public void close() {
        System.out.println("关闭键盘");
    }
    public void type() {
        System.out.println("键盘输入");
    }
}



package day15;

/**
 * @author xpl
 * @create 2023-02-23 15:49
 */
public class Laptop {
    public void powerOn() {
        System.out.println("笔记本电脑开机");
    }
    public void powerOff() {
        System.out.println("笔记本电脑关机");
    }
    public void userService(USB usb) {
        usb.open();
        if(usb instanceof Mouse) {
            Mouse mouse = (Mouse) usb;
            mouse.click();
        }else if(usb instanceof Keyboard) {
            Keyboard keyboard = (Keyboard) usb;
            keyboard.type();
        }

        usb.close();
    }
}


package day15;

/**
 * @author xpl
 * @create 2023-02-23 15:57
 */
public class Test {
    public static void main(String[] args) {
        Laptop laptop = new Laptop();
        laptop.powerOn();

        USB usb = new Mouse();
        laptop.userService(usb);

        Keyboard keyboard = new Keyboard();
        laptop.userService(keyboard);

        //laptop.userService(new Keyboard());
        laptop.powerOff();
    }
}

 

计算出生天数

package day17;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;

/**
 * @author xpl
 * @create 2023-02-23 21:06
 */
public class DateTest {
    public static void main(String[] args) throws ParseException {
        Scanner scanner = new Scanner(System.in);
        String birthday = scanner.next();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Date birthdayDate = sdf.parse(birthday);
        long birthdayDateTime = birthdayDate.getTime();
        long todayTime = new Date().getTime();
        long day = todayTime - birthdayDateTime;
        System.out.println(day / 1000 / 60 / 60 / 24);

    }
}