java中的对象和引用

Question

I am confused as I am new to java, how many objects and references are created in the following piece of code?

MyClass t = new MyClass();
MyClass s = new MyClass();
MyClass v = s;

Please explain the answer:

2 Objects
3 References

Answer 1

A picture is worth more than a thousand words:

Answer 2

An object is an instance of a class, created with new . You use new twice, so there are two objects. ^*

A variable is, generally speaking, a reference. ^** So there are three references ( t , s , v ), although two of them happen to refer to the same object.

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_{* Of course, MyClass itself might create more objects internally.}

_{** Except in the case of primitive types, like int , float , etc.}

Answer 3

2 Object and

3 reference

if you do new you are creating object so there are two new so simply two Objects

and if you define

Foo a;// you have just created a reference

_{* Note: new is only a way to create object, it can be created using otherways too}

Answer 4

So you are creating a new object and storing a reference to that object in t . The same for s . Then you are assigning the s reference to v (not creating a new object). So you have three references and two objects.

Answer 5

Actually, your answer is wrong. It's the other way around:

2 objects (in the first two lines)

3 references (t, s, v, v and s share an object)