是否可以在java中获取class object的值，如果可以如何获取？

Question

Let's say, I am initializing a class obj as follows:

<class> obj = <some value>;

Is it possible to initialize as such I mean we initialize String and primitive values like that, But I mean for any class. And how can we get them so they can be used in some method of the same class?

Answer 1

Let's say, I am initializing a class obj as follows:

<class> obj = <some value>;

Is it possible to initialize as such I mean we initialize String and primitive values like that, But I mean for any class. And how can we get them so they can be used in some method of the same class?

Answer 2

Yes if it is for built in types like string, int, float etc. These built in types are pass by value. Which means if you say int a = 5 , 5 is copied over to memory location.

If you are asking about your class, I do not think so. Unlike C++ you cannot overload operator. Another reason why you cannot do this is objects are pass by reference, meaning

MyClass myObject = <someValue>;

<someValue> is not copied to memory where myObject lives, instead reference (address of) it is. Thus, you need to have new myObject() .

One disclaimer you can do this:

MyClass objA = new MyClass();
MyClass objB = objA;

but it is still copying reference not the actual values from myObj .

OP please read this .

While I think from some aspect this question is duplicate of this , I think the levels of knowledge between OPs of these questions is so far apart that I am not going to flag it.