OnJava8-Examples/concurrency/IntGenerator.java

// concurrency/IntGenerator.java
// <20>2015 MindView LLC: see Copyright.txt

public abstract class IntGenerator {
  private volatile boolean canceled = false;
  public abstract int next();
  // Allow this to be canceled:
  public void cancel() { canceled = true; }
  public boolean isCanceled() { return canceled; }
}