应该在类或构造函数中初始化成员吗? [英] Should members be initialized in the class or the constructor?

问题描述

初始化变量(尤其是在类级别的对象引用)是一种好习惯吗?请考虑以下示例；

Is it a good practice to initialize variables, specially object references at class level? Please consider the following examples;

public class MyClass {

    private static MyObject myObject;

    public static void main(String[] args) {

        myObject = new MyObject();
    }
}

或

public class MyClass {

    private MyObject myObject = new MyObject();

    public static void main(String[] args) {

          // Other code
    }
}

哪种方法最好?请向我介绍两者的优缺点.

Which way is best? Please guide me about the pros and cons of both.

致谢.

推荐答案

通常，由于对象的寿命(可能)较短，因此首选惰性实例化(第一个代码段).您应该支持尽可能短的对象生命期.

In general, lazy instantiation (the first snippet) is preferred since the object has a (potentially) shorter lifetime. You should favor the shortest object lifetime possible.

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