An example of Exchanger. : Exchanger « Threads « Java

1. Java
2. Threads
3. Exchanger

An example of Exchanger.

 
   
import java.util.concurrent.Exchanger;

class ExgrDemo {
  public static void main(String args[]) {
    Exchanger<String> exgr = new Exchanger<String>();

    new UseString(exgr);
    new MakeString(exgr);
  }
}

class MakeString implements Runnable {
  Exchanger<String> ex;

  String str;

  MakeString(Exchanger<String> c) {
    ex = c;
    str = new String();

    new Thread(this).start();
  }

  public void run() {
    char ch = 'A';
    for (int i = 0; i < 3; i++) {
      for (int j = 0; j < 5; j++)
        str += (char) ch++;

      try {
        str = ex.exchange(str);
      } catch (InterruptedException exc) {
        System.out.println(exc);
      }
    }
  }
}

class UseString implements Runnable {
  Exchanger<String> ex;

  String str;

  UseString(Exchanger<String> c) {
    ex = c;
    new Thread(this).start();
  }

  public void run() {

    for (int i = 0; i < 3; i++) {
      try {
        str = ex.exchange(new String());
        System.out.println("Got: " + str);
      } catch (InterruptedException exc) {
        System.out.println(exc);
      }
    }
  }
}

 

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