将类的对象传递给另一个类 [英] passing object of class to another class

问题描述

我有两节课. Class A和Class B.

我要在class B中使用的功能在Class A中.我正在考虑将Class A的引用传递给Class B的构造函数，然后在此之后调用该函数.

I have a function in Class A that i would like to use in class B. I was thinking about passing a reference of Class A to the constructor of Class B and then call the function after that.

那行得通吗?有人可以给我举个例子吗?

Would that work? Can someone show me an example?

提前谢谢！

推荐答案

是的，它将起作用.这是一种不错的方法.您只需通过A类的实例:

Yes, it will work. And it's a decent way to do it. You just pass an instance of class A:

public class Foo {
   public void doFoo() {..} // that's the method you want to use
}

public class Bar {
   private Foo foo;
   public Bar(Foo foo) {
      this.foo = foo;
   }

   public void doSomething() {
      foo.doFoo(); // here you are using it.
   }
}

然后您可以拥有:

Foo foo = new Foo();
Bar bar = new Bar(foo);
bar.doSomething();

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