详解java中的PropertyChangeSupport与PropertyChangeListener
详解java中的PropertyChangeSupport与PropertyChangeListener
java中的PropertyChangeSupport与PropertyChangeListener配合使用能够实现，绑定属性会在属性值发生变化时，通知所有相关的监听器。
javaBean：
packagecom.wang.test.property;
importjava.beans.PropertyChangeListener;
importjava.beans.PropertyChangeSupport;
publicclassTestBean{
protectedfinalPropertyChangeSupportsupport=newPropertyChangeSupport(this);
privateStringstr;
publicStringgetStr(){
returnstr;
}
publicvoidsetStr(Stringstr){
support.firePropertyChange("str",this.str,str);
this.str=str;
}
publicvoidaddPropertyChangeListener(PropertyChangeListenerlistener){
support.addPropertyChangeListener(listener);
}
publicvoidremovePropertyChangeListener(PropertyChangeListenerlistener){
support.removePropertyChangeListener(listener);
}
}
client：
packagecom.wang.test.property;
importjava.beans.PropertyChangeEvent;
importjava.beans.PropertyChangeListener;
publicclassPropertyChangeSupportTest{
publicstaticvoidmain(String[]args){
TestBeantest=newTestBean();
test.setStr("ddddd");
test.addPropertyChangeListener(newPropertyChangeListener1());
test.setStr("yyyy");
//test.addPropertyChangeListener(newPropertyChangeListener2());
//test.setStr("hhhhhhf");
}
publicstaticclassPropertyChangeListener1implementsPropertyChangeListener{
@Override
publicvoidpropertyChange(PropertyChangeEventevt){
System.out.println("1:"+evt.getPropertyName()+""+evt.getNewValue()+""+evt.getOldValue());
}
}
publicstaticclassPropertyChangeListener2implementsPropertyChangeListener{
@Override
publicvoidpropertyChange(PropertyChangeEventevt){
System.out.println("2:"+evt.getPropertyName()+""+evt.getNewValue()+""+evt.getOldValue());
}
}
}
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