需要在属性更改时调用的方法

Question

我在Java类中有一个属性，当Java类中的属性改变它的值时，我需要在同一个类中调用一个方法。我怎么能这样做？

 boolean setInstallMode = false;

 public void callMeWhenChanged() {

    some actions . . . 

 }

Answer 1

将setInstallMode设为私有，然后只通过setter方法设置它。

private boolean installMode = false;

public void setInstallMode(boolean mode)
{
    installMode = mode;
    callMeWhenChanged();
}

public void callMeWhenChanged() {

   some actions . . . 

}

Answer 2

您可以将属性设为private，然后为该属性设置setAttribute方法，然后在该set属性方法中调用callMeWhenChanged

private boolean installMode

public void setInstallMode(boolean o){
    this.installMode = o;
    callMeWhenChanged()
    //WhateverElse
}

Answer 3

 private   boolean setInstallMode = false; // Make attribute as private field

 public void setInstallMode(boolean inBooleanValue){ // write public mutator for this attribute 
  this.setInstallMode =inBooleanValue; // update value

   callMeWhenChanged();// Call your logic
  }


 public void callMeWhenChanged() {

    some actions . . . 

 }

Answer 4

您可以使用属性更改侦听器，如下例所示：

http://examples.javacodegeeks.com/core-java/beans/bean-property-change-event-listener/