No synchronize : Lock Synchronize « Threads « Java

No synchronize

No synchronize
public class WithoutSync extends Object {
  private static int nextSerialNum = 10001;

  public static int getNextSerialNum() {
    int sn = nextSerialNum;

    try { Thread.sleep(1000); } 
    catch ( InterruptedException x ) { }

    return sn;

  private static void print(String msg) {
    String threadName = Thread.currentThread().getName();
    System.out.println(threadName + ": " + msg);

  public static void main(String[] args) {
    try {
      Runnable r = new Runnable() {
          public void run() {
            print("getNextSerialNum()=" + 
      Thread threadA = new Thread(r, "threadA");
      Thread threadB = new Thread(r, "threadB");
      Thread threadC = new Thread(r, "threadC");

      Thread threadD = new Thread(r, "threadD");
    } catch ( InterruptedException x ) {
      // ignore


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