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：
package com.wang.test.property;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
public class TestBean {
protected final PropertyChangeSupport support = new PropertyChangeSupport(this);
private String str;
public String getStr() {
return str;
}
public void setStr(String str) {
support.firePropertyChange("str", this.str, str);
this.str = str;
}
public void addPropertyChangeListener(PropertyChangeListener listener) {
support.addPropertyChangeListener(listener);
}
public void removePropertyChangeListener(PropertyChangeListener listener) {
support.removePropertyChangeListener(listener);
}
}
client：
package com.wang.test.property;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
public class PropertyChangeSupportTest {
public static void main(String[] args) {
TestBean test = new TestBean();
test.setStr("ddddd");
test.addPropertyChangeListener(new PropertyChangeListener1());
test.setStr("yyyy");
//test.addPropertyChangeListener(new PropertyChangeListener2());
//test.setStr("hhhhhhf");
}
public static class PropertyChangeListener1 implements PropertyChangeListener{
@Override
public void propertyChange(PropertyChangeEvent evt) {
System.out.println( "1: " + evt.getPropertyName() + " " + evt.getNewValue() + " " + evt.getOldValue());
}
}
public static class PropertyChangeListener2 implements PropertyChangeListener{
@Override
public void propertyChange(PropertyChangeEvent evt) {
System.out.println( "2: " + evt.getPropertyName() + " " + evt.getNewValue() + " " + evt.getOldValue());
}
}
}
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