我是初学者，我必须为特定的 prob stmt 编写代码。我想用锁来实现它。事先，我了解了锁的工作原理及其方法。
在我下面的代码中，我需要第一个线程等待，第二个线程向第一个线程发出信号并唤醒。但是信号并没有唤醒我的等待线程。任何人都可以帮忙。
package com.java.ThreadDemo;
import java.util.Collection;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class ThreadEx {
public static void main (String args[]) throws InterruptedException
{
ThreadMy mt[]=new ThreadMy[6];
int a=1, b=2;
mt[1] = new ThreadMy(a);
mt[2] = new ThreadMy(b);
mt[1].start ();
Thread.sleep(100);
mt[2].start ();
}
}
class ThreadMy extends Thread
{
final ReentrantLock rl = new ReentrantLock() ;
Condition rCond = rl.newCondition();
//private final Condition wCond = rl.newCondition();
int i;
int c;
public ThreadMy(int a)
{
c=a;
}
public void run()
{
System.out.print("\nThread "+c+" "+rl.isHeldByCurrentThread()+" "+rl.isLocked() );
rl.lock();
try
{
//for (i=0;i<2;i++)
System.out.print("\nThread "+c+" "+rl.isHeldByCurrentThread()+" "+rl.getHoldCount() );
try
{
if (c==1)
{
System.out.print("await\n");
rCond.await();
//rCond.await(200, TimeUnit.MILLISECONDS);
System.out.print("signal\n");
}
else
{
System.out.print("P");
rCond.signal();
Thread.sleep(2000);
System.out.print("P1");
}
//rCond.signal();
}
catch ( InterruptedException e)
{
//System.out.print("Exception ");
}
}
finally
{
rl.unlock();
}
System.out.print("\n run " + c);
}
}