java中的循环引用 [英] Cyclic reference in java

问题描述

如果A类引用了B类而B类引用了A类，那么它在Java中是否可以接受？如果是，当我们执行A类时，B类将不会被实例化。那么编译器将如何执行B类的引用？

If class A has a reference of class B and class B has a reference of class A, is it acceptable in Java? If yes, When we execute class A by the time class B will not be instantiated. So how the compiler will execute the reference of class B?

TIA

推荐答案

如果A类引用了B类而B类引用了A类，那么它在Java中是否可以接受？

If class A has a reference of class B and class B has a reference of class A, is it acceptable in Java?

是。

当我们执行时时间类B的A类不会被实例化。那么编译器将如何执行B类的引用？

When we execute class A by the time class B will not be instantiated. So how the compiler will execute the reference of class B?

你必须先创建一个对象来创建循环引用，然后再另一个，然后关闭循环;例如这样的事情。

You have to create the cyclic reference by creating one object first, and then the other, and then closing the cycle; e.g. something like this.

A a = new A();
B b = new B(a);
a.setB(b);

（这假设 A 类有已经用 setB（A）方法定义。还有其他形成循环的方法，但这是最简单的。）

(This assumes that the A class has been defined with a setB(A) method. There are other ways to form the cycle too, but this is the simplest.)

但请注意，你的术语都是完全错误的。

But note that your terminology is all completely wrong.

• 你不要执行一个班级。您实例化或创建类的实例。


• 编译器（例如 javac ）没有执行任何东西......它只是编译代码。


• 执行的东西（即运行）Java代码是Java虚拟机;例如当你使用 java 命令。

• You don't "execute" a class. You instantiate or create an instance of a class.
• The compiler (for example javac) doesn't "execute" anything ... it just compiles code.
• The thing that executes (i.e runs) Java code is a Java Virtual Machine; e.g. when you use the java command.

（你学习很重要如果要与其他IT专业人员进行通信，请使用正确的Java术语。它避免了很多错误传达和混淆！）

(It is important that you learn and use the correct Java terminology if you are going to communicate with other IT professionals. It avoids a lot of miscommunication and confusion!)

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