Java AtomicInteger class

Introduction

java.util.concurrent.atomic can get, set, or compare the value of a variable in one uninterruptible operation.

No lock or other synchronization mechanism is required.

The following code shows how to access a shared integer via AtomicInteger : 

// A simple example of Atomic. 

import java.util.concurrent.atomic.AtomicInteger;

public class Main {

  public static void main(String args[]) {
    new AtomThread("A");
    new AtomThread("B");
    new AtomThread("C");
  }//w w w.  j  a  v a2  s  .  co  m
}

class Shared {
  static AtomicInteger ai = new AtomicInteger(0);
}

// A thread of execution that increments count.
class AtomThread implements Runnable {
  String name;

  AtomThread(String n) {
    name = n;
    new Thread(this).start();
  }

  public void run() {

    System.out.println("Starting " + name);

    for (int i = 1; i <= 3; i++)
      System.out.println(name + " got: " + Shared.ai.getAndSet(i));
  }
}



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