时钟得计时

package com.lovo;

import java.util.Calendar;

/**

 * 时钟类

 * @author 吕懋

 *

 */

public class Clock {

private int hour; // 时

private int minute; // 分

private int second; // 秒

/**

* 构造器

*/

public Clock() {

Calendar cal = Calendar.getInstance();

hour = cal.get(11);

minute = cal.get(12);

second = cal.get(13);

}

/**

* 走字

*/

public void go() {

second++;

if(second == 60) {

second = 0;

minute++;

if(minute == 60) {

minute = 0;

hour++;

if(hour == 24) {

hour = 0;

}

}

}

}

/**

* 显示时间

* @return 当前时间的字符串

*/

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;

}

}                                

          测试

package com.lovo;


public class Test04 {


public static void main(String[] args) throws Exception {
Clock c = new Clock();
while(true) {
System.out.println(c.showTime());
c.go();
Thread.sleep(1000);// 让当前程序休眠1秒钟
}
}
}