awaituntil()  等到 boolean awaitUntil(Date deadline) throws InterruptedException   Date 时间时释放锁。当另一个线程获得了锁没有释放时，虽然awituntil时间已经到了，它没有锁，所以必须等到另一个线程释放锁之后它在执行awaituntil下面的内容。当另一个线程获得锁后，后来已经释放，因为notiyAll 会唤醒所有线程,所以使用awituntil方法的线程也将被唤醒，但如果不使用notifyall来唤醒线程则使用awaitUntil线程还是会等待当前时间到了之后才会被唤醒因为当它再次得到锁它还是处于等待状态，等到达设定的时间才会被唤醒。例子如下：

package com.RentTrantLock;

public class RunawitUntil {
public static void main(String[] args) {
AwaitUntilService service=new AwaitUntilService();
MythreadAwitUntilA mythread=new MythreadAwitUntilA(service);
MythreadAwitUntilB mythread1=new MythreadAwitUntilB(service);
mythread1.start();

mythread.start();


}
}

package com.RentTrantLock;

import java.util.Calendar;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;

public class AwaitUntilService {
private ReentrantLock lock=new ReentrantLock();
private Condition condition=lock.newCondition();
public void TestMethod(){
try{
Calendar calendarRef=Calendar.getInstance();
System.out.println("CalendarRenf:"+calendarRef);

calendarRef.add(Calendar.SECOND, 3);
System.out.println("CalendarRenf1:"+calendarRef);
lock.lock();
System.out.println("wait begin time="+System.currentTimeMillis());
condition.awaitUntil(calendarRef.getTime());
System.out.println("wait end   time ="+System.currentTimeMillis());
}catch(InterruptedException e){
e.printStackTrace();
}finally{
lock.unlock();
}


}


public void notifyMethod(){
try{
Calendar calendarRenf=Calendar.getInstance();
System.out.println("CalendarRenf:"+calendarRenf);
calendarRenf.add(Calendar.SECOND, 10);
System.out.println("CalendarRenf1:"+calendarRenf);
lock.lock();
System.out.println("notify begin timer="+System.currentTimeMillis());
/*   try {
Thread.sleep(5000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}*/
//           condition.signalAll();
System.out.println("notify  end   time="+System.currentTimeMillis());
}finally{
lock.unlock();   
}

}




}

package com.RentTrantLock;

public class MythreadAwitUntilB extends Thread{
private AwaitUntilService   service;
public MythreadAwitUntilB(AwaitUntilService service){
this.service=service;

}

public void run(){
service.notifyMethod();

}

}

运行结果

CalendarRenf:java.util.GregorianCalendar[time=1511444014513,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Asia/Shanghai",offset=28800000,dstSavings=0,useDaylight=false,transitions=19,lastRule=null],firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2017,MONTH=10,WEEK_OF_YEAR=47,WEEK_OF_MONTH=4,DAY_OF_MONTH=23,DAY_OF_YEAR=327,DAY_OF_WEEK=5,DAY_OF_WEEK_IN_MONTH=4,AM_PM=1,HOUR=9,HOUR_OF_DAY=21,MINUTE=33,SECOND=34,MILLISECOND=513,ZONE_OFFSET=28800000,DST_OFFSET=0]
CalendarRenf:java.util.GregorianCalendar[time=1511444014513,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Asia/Shanghai",offset=28800000,dstSavings=0,useDaylight=false,transitions=19,lastRule=null],firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2017,MONTH=10,WEEK_OF_YEAR=47,WEEK_OF_MONTH=4,DAY_OF_MONTH=23,DAY_OF_YEAR=327,DAY_OF_WEEK=5,DAY_OF_WEEK_IN_MONTH=4,AM_PM=1,HOUR=9,HOUR_OF_DAY=21,MINUTE=33,SECOND=34,MILLISECOND=513,ZONE_OFFSET=28800000,DST_OFFSET=0]
CalendarRenf1:java.util.GregorianCalendar[time=1511444017513,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Asia/Shanghai",offset=28800000,dstSavings=0,useDaylight=false,transitions=19,lastRule=null],firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2017,MONTH=10,WEEK_OF_YEAR=47,WEEK_OF_MONTH=4,DAY_OF_MONTH=23,DAY_OF_YEAR=327,DAY_OF_WEEK=5,DAY_OF_WEEK_IN_MONTH=4,AM_PM=1,HOUR=9,HOUR_OF_DAY=21,MINUTE=33,SECOND=37,MILLISECOND=513,ZONE_OFFSET=28800000,DST_OFFSET=0]
CalendarRenf1:java.util.GregorianCalendar[time=1511444024513,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Asia/Shanghai",offset=28800000,dstSavings=0,useDaylight=false,transitions=19,lastRule=null],firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2017,MONTH=10,WEEK_OF_YEAR=47,WEEK_OF_MONTH=4,DAY_OF_MONTH=23,DAY_OF_YEAR=327,DAY_OF_WEEK=5,DAY_OF_WEEK_IN_MONTH=4,AM_PM=1,HOUR=9,HOUR_OF_DAY=21,MINUTE=33,SECOND=44,MILLISECOND=513,ZONE_OFFSET=28800000,DST_OFFSET=0]
wait begin time=1511444014531
notify begin timer=1511444014531
notify  end   time=1511444014531
wait end   time =1511444017516