Make List a Thread-Safe Class : Collections « Utility Classes « SCJP

1. SCJP
2. Utility Classes
3. Collections

import java.util.Collections;
import java.util.LinkedList;
import java.util.List;

public class MainClass {
  private List names = Collections.synchronizedList(new LinkedList());

  public void add(String name) {
    names.add(name);
  }

  public String removeFirst() {
    if (names.size() > 0)
      return (String) names.remove(0);
    else
      return null;
  }

  public static void main(String[] args) {
    final MainClass nl = new MainClass();
    nl.add("Ozymandias");
    class NameDropper extends Thread {
      public void run() {
        String name = nl.removeFirst();
        System.out.println(name);
      }
    }
    Thread t1 = new NameDropper();
    Thread t2 = new NameDropper();
    t1.start();
    t2.start();
  }
}

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