详解java中的PropertyChangeSupport与PropertyChangeListener
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2024-03-02 12:43:04
详解java中的propertychangesupport与propertychangelistener
java中的propertychangesupport与prop...
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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