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请你可以检查下面的代码，这是数字时钟没有util.concurrent包，日历使用睡眠，通知，等待。代码正确执行，请提出任何更好的方法。非常感谢数字时钟与多线程只有睡眠，等待和通知
/**
*
*/
package com.nagihome.clock;
/**
* @author Nagi
*
*/
public class ThreadAlarmClock {
private static Integer hours = 23;
private static Integer minutes = 59;
private static Integer seconds = 55;
private static Integer minSecLastNum = 60;
private static Integer hour24LastNum = 24;
private static String COLON = ":";
private static Boolean isMinUpdatable = false;
private static Boolean isHourUpdatable = false;
final static Object lock = new Object();
public void updateSeconds() throws InterruptedException {
synchronized (lock) {
while (true) {
if (isMinUpdatable || isHourUpdatable) {
lock.wait();
} else {
Thread.sleep(1000);
seconds++;
if (seconds.equals(minSecLastNum)) {
seconds = 0;
isMinUpdatable = true;
lock.notifyAll();
} else {
displayTime();
}
}
}
}
}
public void updateMinutes() throws InterruptedException {
synchronized (lock) {
while (true) {
if (!isMinUpdatable) {
lock.wait();
} else if (isMinUpdatable) {
minutes++;
isMinUpdatable = false;
if (minutes.equals(minSecLastNum)) {
minutes = 0;
isHourUpdatable = true;
} else {
displayTime();
}
}
lock.notifyAll();
}
}
}
public void updateHours() throws InterruptedException {
synchronized (lock) {
while (true) {
if (!isHourUpdatable) {
lock.wait();
} else if (isHourUpdatable) {
hours++;
isHourUpdatable = false;
if (hours.equals(hour24LastNum)) {
hours = 0;
}
displayTime();
}
lock.notifyAll();
}
}
}
public void displayTime() {
System.out.println(hours + COLON + minutes + COLON + seconds);
}
}
/**
*
*/
package com.nagihome.clock;
/**
* @author Nagi
*
*/
public class SecondsThread implements Runnable {
private ThreadAlarmClock clock;
public SecondsThread(ThreadAlarmClock clock) {
this.clock = clock;
}
/*
* (non-Javadoc)
*
* @see java.lang.Runnable#run()
*/
@Override
public void run() {
try {
clock.updateSeconds();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
/**
*
*/
package com.nagihome.clock;
/**
* @author Nagi
*
*/
public class MinutesThread implements Runnable {
private ThreadAlarmClock clock;
public MinutesThread(ThreadAlarmClock clock) {
this.clock = clock;
}
/*
* (non-Javadoc)
*
* @see java.lang.Runnable#run()
*/
@Override
public void run() {
try {
clock.updateMinutes();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
/**
*
*/
package com.nagihome.clock;
/**
* @author Nagi
*
*/
public class HoursThread implements Runnable {
private ThreadAlarmClock clock;
public HoursThread(ThreadAlarmClock clock) {
this.clock = clock;
}
/*
* (non-Javadoc)
*
* @see java.lang.Runnable#run()
*/
@Override
public void run() {
try {
clock.updateHours();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
/**
*
*/
package com.nagihome.main;
import com.nagihome.clock.HoursThread;
import com.nagihome.clock.MinutesThread;
import com.nagihome.clock.SecondsThread;
import com.nagihome.clock.ThreadAlarmClock;
/**
* @author Nagi
*
*/
public class Main {
/**
* @param args
* @throws InterruptedException
*/
public static void main(String[] args) throws InterruptedException {
ThreadAlarmClock clock = new ThreadAlarmClock();
new Thread(new SecondsThread(clock)).start();
new Thread(new MinutesThread(clock)).start();
new Thread(new HoursThread(clock)).start();
}
}