myBean.addPropertyChangeListener(new myVetoableChangeListener());
class MyVetoableChangeListener implements VetoableChangeListener{
public void vetoableChange(PropertyChangeEvent evt)throws PropertyVetoException{
Object oldValue=evt.getOldValue();
Object newValue=evt.getNewValue();
//确定改变是否被否决,然后预防改变
boolean veto=false;
if(veto){
throw new PropertyVetoException("the reason for the veto",evt);
}
}
}
class MyVetoableChangeListener implements VetoableChangeListener{
public void vetoableChange(PropertyChangeEvent evt)throws PropertyVetoException{
Object oldValue=evt.getOldValue();
Object newValue=evt.getNewValue();
//确定改变是否被否决,然后预防改变
boolean veto=false;
if(veto){
throw new PropertyVetoException("the reason for the veto",evt);
}
}
}
解决方案 »
免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货