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java 中 valueChanged 具体用法含义是怎样的?

我在看apache eagle源码的时候,看么了很多地方用以下结构:

    public void setConfig(String config) {
        this.config = config;
        valueChanged("config");
    }

很多地方都用到了

this.aaa = aaa;
valueChanged("aaa");

这样的结构,请问这个valueChanged具体有什么用啊?网上查资料也没有查到相关内容。


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