使用Vector实现简单线程池

主要原理:
   一、 ThreadPoolManager在实例化时创建十个线程,放入Vector中。
   二、 每个SimpleThread线程的是否在运行的标记runningFlag设置为false。
   三、 当使用ThreadPoolManager的process方法处理时,遍历Vector中的线程,如果当前遍历到的线程不在运行中,则使用当前线程,并设置运行标记runningFlag为true。
   四、 当前线程的运行标记位为false时,线程wait(),为true时开始处理字符串。
   五、 为了使得线程运行时每个线程独占一个任务,在SimpleThread的run()方法中使线程sleep(5000),这样一个线程接手一个任务后,在睡眠期间再来其他任务由下个标记为false的线程接手。
代码如下:
 
 // SimpleThread:
  public class SimpleThread extends Thread {

	private boolean runningFlag;
	private String argument;

	public boolean isRunning() {
		return runningFlag;
	}

	public synchronized void setRunning(boolean flag) {

		runningFlag = flag;
		if (flag) {
			this.notify();
		}
	}

	public String getArgument() {

		return argument;
	}

	public void setArgument(String string) {

		argument = string;
	}

	public SimpleThread(int threadNumber) {
		runningFlag = false;
		System.out.println("thread " + threadNumber + " started;");
	}

	public synchronized void run() {
		try {
			while (true) {
				if (!runningFlag) {
					this.wait();
				} else {
					System.out.println("processing: " + getArgument() + "..done");
					sleep(5000);
					System.out.println("thread is sleeping");
					setRunning(false);
				}
			}
		} catch (InterruptedException e) {
			System.out.println("InterruptedException");
		}

	}
}

//ThreadPoolManager:

public class ThreadPoolManager {

	private int maxThread;

	public Vector vector;

	public void setMaxThread(int threadCount) {
		maxThread = threadCount;

	}

	public ThreadPoolManager(int threadCount) {
		setMaxThread(threadCount);
		System.out.println("starting thread pool....");

		vector = new Vector();
		for (int i = 0; i < 10; i++) {
			SimpleThread thread = new SimpleThread(i);
			vector.addElement(thread);
			thread.start();
		}
	}

	public void process(String argument) {

		int i;
		for (i = 0; i < vector.size(); i++) {
			SimpleThread currentThread = (SimpleThread) vector.elementAt(i);
			if (!currentThread.isRunning()) {
				System.out.println("thread" + (i + 1) + "is processing::"
						+ argument);
				currentThread.setArgument(argument);
				currentThread.setRunning(true);
				break;
			}
			if (i == (vector.size() - 1)) {

				System.out.println("pool is full,try in another time.");
			}

		}
	}
}

//测试类
public class TestThreadPool {

	public static void main(String[] args) {
		try {

			BufferedReader br = new BufferedReader(new InputStreamReader(
					System.in));
			String s;
			ThreadPoolManager manager = new ThreadPoolManager(10);
			while ((s = br.readLine()) != null) {
				manager.process(s);
			}

		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}
  

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