day1020

package com.lovo;
/**
 * 时钟类
 * @author 文波
 *
 */
import java.util.Calendar;

public class Clock {
    private int hour;
    private int minute;
    private int second;

public Clock() {
        Calendar cal = Calendar.getInstance();
        hour = cal.get(11);
        minute = cal.get(12);
        second = cal.get(13);

    }

    public void go() {
        second++;
        if (second == 60) {
            minute += 1;
            second = 0;
            if (minute == 60) {
                hour += 1;
                minute = 0;
            }
            if (hour >= 24) {
                hour = 0;
            }

        }

    }

    public String showTime() {
        String time = "";
        if (hour < 10) {
            time += "0";
        }
        time += hour + ":";
        if (minute < 10) {
            time += "0";
        }
        time += minute + ":";
        if (second < 10) {
            time += "0";
        }
        time += second;
        return time;
    }

}

package com.lovo;

public class Test01 {
    public static void main(String[] args) throws Exception {
        Clock c = new Clock();
        while(true) {
            System.out.println(c.showTime());
            c.go();
            Thread.sleep(1000);    
        }
    }

}

package com.lovo;
/**
 * 同心圆
 * @author 文波
 *
 */

public class Yuan {
    private double banjin;

    public Yuan(double banjin) {
        this.banjin = banjin;
    }
    
    public void  weilan(){
        
        double zhouchang = (banjin + 3) * 2 * 3.14;
        System.out.printf("围栏需要%.2f元\n" , zhouchang * 8 );
    }
    public void  dizhuan(){
        
        double mianji = (banjin + 3) * (banjin + 3) * 3.14 - banjin * banjin * 3.14;
        System.out.printf("地砖需要%.2f元\n" , mianji * 10 );
    }
    

}

package com.lovo;

public class Test02{
    public static void main(String[] args) {
        Yuan p1 = new Yuan(8);
        
        p1.weilan();
        p1.dizhuan();
    }

}