intlabel.java

来自「java 完全探索的随书源码」· Java 代码 · 共 23 行

import javax.swing.*;
import java.util.*;

public class IntLabel extends JLabel implements Observer {
  private ObservableInt intValue;     // The value being observed

  public IntLabel(ObservableInt theInt) {
    intValue = theInt;

    // Tell intValue you're interested in it
    intValue.addObserver(this);

    // Initialize the label to the current value of intValue
    setText( "" + intValue.getValue() );
  }

  // Update will be called whenever intValue is changed, so just update
  // the label text.
  public void update(Observable obs, Object arg) {
    setText( "" + intValue.getValue() );
  }
}