Handle concurrent read/write: use synchronized to lock the data

     

import java.util.Iterator;
import java.util.Vector;

public class Main {
  Vector data = new Vector();

  public Main() {
    new Producer().start();
    new Consumer().start();

  }

  public static void main(String[] args) throws Exception {
    new Main();
  }

  class Consumer extends Thread {
    Consumer() {
      super("Consumer");
    }

    public void run() {
      while (true) {
        synchronized (data) {
          Iterator it = data.iterator();
          while (it.hasNext())
            it.next();
        }
      }
    }
  }

  class Producer extends Thread {
    Producer() {
      super("Producer");
    }

    public void run() {
      while (true) {
        data.addElement(new Object());
        if (data.size() > 1000)
          data.removeAllElements();
      }
    }
  }
}

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Handle concurrent read/write: use synchronized to lock the data : Lock Synchronize « Threads « Java

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