PropertyChangeListener

来源：互联网发布：网络印刷平台论文编辑：程序博客网时间：2024/05/10 21:21

http://vakinge.iteye.com/blog/441908

接口 java.beans.PropertyChangeListener

顾名思义监听属性改变事件，最近做一些东西需要用到数据绑定相关东西，用到了这个接口。

这里做一个简单DEMO。

public class DemoBeans {private String demoName;PropertyChangeSupport listeners = new PropertyChangeSupport(this);public DemoBeans() {demoName = "initValue";}public String getDemoName() {return demoName;}public void setDemoName(String demoName) {String oldValue = this.demoName;this.demoName = demoName;//发布监听事件firePropertyChange("demoName", oldValue, demoName);}public void addPropertyChangeListener(PropertyChangeListener listener) {listeners.addPropertyChangeListener(listener);}public void removePropertyChangeListener(PropertyChangeListener listener){listeners.addPropertyChangeListener(listener);}/** * 触发属性改变的事件 */    protected void firePropertyChange(String prop, Object oldValue, Object newValue) {        listeners.firePropertyChange(prop, oldValue, newValue);    }   }

public class Main {/** * @param args */public static void main(String[] args) {DemoBeans beans = new DemoBeans();beans.addPropertyChangeListener(new PropertyChangeListener(){public void propertyChange(PropertyChangeEvent evt) {System.out.println("OldValue:"+evt.getOldValue());System.out.println("NewValue:"+evt.getNewValue());System.out.println("tPropertyName:"+evt.getPropertyName());}});beans.setDemoName("test");}}