/**
 * @(#)ThreadPool.java
 *
 *
 * @author 
 * @version 1.00 2007/10/26
 */

package multithread2;
import java.util.LinkedList;
public class ThreadPool extends ThreadGroup{
private  boolean isClosed=false;
private  LinkedList <Runnable> workQueue;
private static int threadPoolID;
private int threadID;
    public ThreadPool(int poolSize) {
        super("ThreadPool-"+(threadPoolID++));
        setDaemon(true);
        workQueue=new LinkedList<Runnable>();
        for(int i=0;i<poolSize;i++){
            new WorkThread().start();
        }
    }
    public synchronized woid execute(Runnable task){
        if(isClosed){
            throw new IllegalStateException();
        }
        if(task!=null){
            workQueue.add(task);
            notify();
        }
    }
    protected synchronized  Runnable getTask()throws InterruptedException{
        while(workQueue.size()==0){
            if(isClosed)return null;
            wait();
        }
        return workQueue.removeFirst();
    }
    public synchronized void close(){
        if(!isClosed){
           isClosed=true;
           workQueue.clear();
           interrupt();
        }
    }
    public void jion(){
        synchronized (this){
            isClosed=true;
            notifyAll();
        }
        Thread[]threads=new Thread[activeCount()];
        int count=enumerate(threads);
        for(int i=0;i<count;i++){
            try{
                threads[i].join();
            }
            catch(InterruptedException ex){}
        }
    }
    private class WorkThread extends Thread{
        public WorkThread(){
            super(ThreadPool.this,"WorkThread-"+(threadID++));
        }
        public void run(){
            while(!isInterrupted()){
                Runnable task=null;
                try{
                    task=getTask();
                }catch(InterruptedException ex){
                }
                if(task==null)return;
                try{
                    task.run();
                }catch(Throwable t){
                    t.printStackTrace();
                }
            }
        }
    }
}
编译的时候就出错了
--------------------配置:            <Default>--------------------
E:\java game\ThreadPool.java:13: <identifier> expected
private  LinkedList <Runnable> workQueue;
                    ^
E:\java game\ThreadPool.java:19: '(' or '[' expected
        workQueue=new LinkedList<Runnable>();
                                ^
2 errors
我用的java 1.6