Synchronized

import java.util.*;
import java.util.concurrent.*;
class Task
{	
	private LinkedList<Integer> list = new LinkedList<Integer>();
	private static int num=0;
	public synchronized void take(){
		while(num<=0){
			try{
				super.wait() ;
			}catch(InterruptedException e){
				e.printStackTrace() ;
			}
		}
		num--;
		int a=list.remove(0);
		System.out.println("after "+Thread.currentThread().getName()+" get="+a+" current size="+num);
		super.notifyAll();// 
	}
	public synchronized void put(int a){
		while(num>=10){
			try{
				super.wait() ;
			}catch(InterruptedException e){
				e.printStackTrace() ;
			}
		}
		num++;
		list.add(a);
		System.out.println("after "+Thread.currentThread().getName()+" put="+a+" current size="+num);
		super.notifyAll();// 
	}
};
class PutThread implements Runnable
{
	private Task task;
	private final CyclicBarrier cb;
	public PutThread(Task task,CyclicBarrier cb)
	{
		this.task=task;
		this.cb=cb;
	}
	public void run()
	{		
		this.task.put(1);
		try
    	{
			cb.await();
		}
		catch (Exception e)
		{
		}	
	}
}
class TakeThread implements Runnable
{
	private Task task;
	private final CyclicBarrier cb;
	public TakeThread(Task task,CyclicBarrier cb)
	{
		this.task=task;
		this.cb=cb;
	}
	public void run()
	{
		this.task.take();
		try
		{
			cb.await();
		}
		catch (Exception e)
		{
		}
	}
}
public class TestSyn
{
	public static void main(String [] args)
	{
		long start=(new Date()).getTime();
		Task t=new Task();
		final long begin=(new Date()).getTime();
		CyclicBarrier cb =new CyclicBarrier(20000,new Runnable(){
			public void run()
			{
				long end=(new Date()).getTime();
				System.out.println(end-begin);
			}
		});
		for(int i=0;i<10000;i++)
		{
		  new Thread(new PutThread(t,cb)).start();
		}

		for(int j=0;j<10000;j++)
		{
			new Thread(new TakeThread(t,cb)).start();
		}		
	}
}

前にlockでマルチスレッドを実現する文章を送ったことがありますが、synchronizedで実現した文章で、読者は自分で許可して、速度を比較することができます.