为什么要使用getter和setter / accessor？

问题：

What's the advantage of using getters and setters - that only get and set - instead of simply using public fields for those variables? 使用仅获取和设置的getter和setter而不是仅对这些变量使用公共字段的优点是什么？

If getters and setters are ever doing more than just the simple get/set, I can figure this one out very quickly, but I'm not 100% clear on how: 如果getter和setter所做的不只是简单的get / set，我可以很快地弄清楚这一点，但是我不清楚如何做到这一点：

public String foo;

is any worse than: 比以下任何方面都更糟糕：

private String foo;
public void setFoo(String foo) { this.foo = foo; }
public String getFoo() { return foo; }

Whereas the former takes a lot less boilerplate code. 而前者需要更少的样板代码。

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解决方案：

参考一： https://stackoom.com/question/6Zvn/为什么要使用getter和setter-accessor
参考二： https://oldbug.net/q/6Zvn/Why-use-getters-and-setters-accessors

来源：oschina

链接：https://my.oschina.net/stackoom/blog/4303668