boundattrbean.java

精通JBuilder2006 源代码 精通JBuilder2006 源代码

package chapter7.attribute;

import java.awt.*;
import java.beans.*;

public class BoundAttrBean extends Canvas{
  String noteString = "Hello";  //noteString是一个bound属性
  private PropertyChangeSupport changes = new PropertyChangeSupport(this);

  public void setString(String newString) {
    String oldString = noteString;
    noteString = newString;
    /* noteString的属性值已发生变化，于是接着触发属性改变事件 */
    changes.firePropertyChange("ourString", oldString, newString);
  }
  public String getString() {
    return noteString;
  }
  public void addPropertyChangeListener(PropertyChangeListener l) {
    changes.addPropertyChangeListener(l);
  }
  public void removePropertyChangeListener(PropertyChangeListener l) {
    changes.removePropertyChangeListener(l);
  }
}