e002. implementing a bound property.txt

来自「这里面包含了一百多个JAVA源文件」· 文本 代码 · 共 24 行

A bound property fires a PropertyChangeEvent whenever its value is changed. This example bean implements a single bound integer property called myProperty. 
    
int myProperty;
    public int getMyProperty() {
        return myProperty;
    }
    public void setMyProperty(int newValue) {
        int oldValue = myProperty;
        myProperty = newValue;
        pceListeners.firePropertyChange("myProperty", new Integer(oldValue), new Integer(newValue));
    }
    
    // Create the listener list.
    PropertyChangeSupport pceListeners = new PropertyChangeSupport(this);
    
    // The listener list wrapper methods.
    public synchronized void addPropertyChangeListener(PropertyChangeListener listener) {
        pceListeners.addPropertyChangeListener(listener);
    }
    public synchronized void removePropertyChangeListener(PropertyChangeListener listener) {
        pceListeners.removePropertyChangeListener(listener);
    }