构造函数结束后调用方法 [英] Call a method after the constructor has ended

问题描述

构造函数结束后，我需要调用一个方法，但我不知道该怎么做.我有这个课:

I need to call a method after the constructor has ended and I have no idea how to do. I have this class:

Class A {
    public A() {
        //...
    }

    public void init() {
        //Call after the constructor
    }
}

推荐答案

您要么必须在客户端执行此操作，

You either have to do this on the client side, as so:

A a = new A();
a.init();

否则您将必须在构造函数的末尾执行该操作:

or you would have to do it in the end of the constructor:

class A {
    public A() {
        // ...
        init();
    }

    public final void init() {
        // ...
    }
}

但是，不建议使用第二种方法，除非您将方法设为私有或最终方法.

The second way is not recommended however, unless you make the method private or final.

另一种替代方法可能是使用工厂方法:

Another alternative may be to use a factory method:

class A {
    private A() {  // private to make sure one has to go through factory method
        // ...
    }
    public final void init() {
        // ...
    }
    public static A create() {
        A a = new A();
        a.init();
        return a;
    }
}

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