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Snailclimb merged 1 commit into from
Aug 29, 2018
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Update Java基础知识.md #15

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2 changes: 1 addition & 1 deletion Java相关/Java基础知识.md
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Expand Up @@ -224,7 +224,7 @@ new运算符，new创建对象实例（对象实例在堆内存中），对象

方法的返回值是指我们获取到的某个方法体中的代码执行后产生的结果！（前提是该方法可能产生结果）。返回值的作用:接收出结果，使得它可以用于其他的操作！

## 21. 一个类的构造方法的作用是什么？若一个类没有声明构造方法，改程序能正确执行吗？为什么？
## 21. 一个类的构造方法的作用是什么？若一个类没有声明构造方法，该程序能正确执行吗？为什么？

主要作用是完成对类对象的初始化工作。可以执行。因为一个类即使没有声明构造方法也会有默认的不带参数的构造方法。

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