goods.java

java模式设计

package beandemo;
import java.beans.*;

public class Goods {
	PropertyChangeSupport changes=new PropertyChangeSupport(this);
	VetoableChangeSupport veto=new VetoableChangeSupport(this);
	
	private float price=10000;
	private String name;
	public Goods(){
		this.addPropertyChangeSupport(new ChangeListener());
		this.addVetoableChangeSupport(new VetoListener());
		
		
	}
	
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public float getPrice() {
		return price;
	}
	
	public void setPrice(float price) throws PropertyVetoException{
		
		float oldprice=this.price;		
		veto.fireVetoableChange(name,new Float(oldprice),new Float(price));
		this.price = price;
		changes.firePropertyChange(name,new Float(oldprice),new Float(price));
		
		
	}
	
	public void addVetoableChangeSupport(VetoableChangeListener l){
		veto.addVetoableChangeListener(l);
		
	}
	public void removeVetoableChangeSupport(VetoableChangeListener l){
		veto.removeVetoableChangeListener(l);
		
	}
	
	public void addPropertyChangeSupport(PropertyChangeListener l){
		changes.addPropertyChangeListener(l)	;	
	}
	
	public void removePropertyChangeSupport(PropertyChangeListener l){
		changes.removePropertyChangeListener(l);
	}

}