observableint.java

来自「java 完全探索的随书源码」· Java 代码 · 共 28 行

import java.util.*;

public class ObservableInt extends Observable {
  int value;     // The value everyone wants to observe

  public ObservableInt() {
  }

  public ObservableInt(int newValue) {
    value = newValue;
  }

  public synchronized void setValue(int newValue) {
    //
    // Check to see that this call is REALLY changing the value
    //
    if (newValue != value) {
      value = newValue;
      setChanged();
      notifyObservers();
    }
  }

  public synchronized int getValue() {
    return value;
  }
}