将类的引用传递给另一个类 [英] passing reference of class to another class

问题描述

我有两个类。 A类和 B类。

函数在 A类，我想在类B 中使用。我正在考虑将 A类的引用传递给 B类的构造函数，然后调用该函数。

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.

会有效吗？有人可以给我一个例子吗？

Would that work? Can someone show me an example?

提前感谢！

推荐答案

是的，它会工作。这是一个体面的方式。您只需传递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：

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

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