vetolistener.java

java模式设计

package beandemo;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyVetoException;
import java.beans.VetoableChangeListener;

public class VetoListener implements VetoableChangeListener {

	public void vetoableChange(PropertyChangeEvent arg0)
			throws PropertyVetoException {
		Float newprice=(Float)arg0.getNewValue();
		if(newprice.floatValue()>15000){
			throw new PropertyVetoException("把价格调得太高了",arg0);			
		}
		if(newprice.floatValue()<5000){
			throw new PropertyVetoException("把价格调得太低了",arg0);			
		}

	}

}