Suggesting when to switch threads with yield()

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// : c13:YieldingThread.java
// Suggesting when to switch threads with yield().
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

public class YieldingThread extends Thread {

  private int countDown = 5;

  private static int threadCount = 0;

  public YieldingThread() {
    super("" + ++threadCount);
    start();
  }

  public String toString() {
    return "#" + getName() + ": " + countDown;
  }

  public void run() {
    while (true) {
      System.out.println(this);
      if (--countDown == 0)
        return;
      yield();
    }
  }

  public static void main(String[] args) {
    for (int i = 0; i < 5; i++)
      new YieldingThread();
  }
} ///:~


           
         
  

[출처] http://www.java2s.com/Code/Java/Threads/Suggestingwhentoswitchthreadswithyield.htm