标签：java png ges 9.png 技术 分享 -- image http
不要编写返回引用可变对象的访问器方法。
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传引用：相当于别名。
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标签：java png ges 9.png 技术 分享 -- image http
原文地址：http://www.cnblogs.com/microcat/p/6768220.html
