java类中的this（指针）JAVA

Question

public class Try {
    String name="";
    int age=13;
    public void changer(Try t) {
        t = this;
    }
}

what does t=this do in this code? I know this normally refers to the starting variable in top but int his case it looks like it does nothing?

Answer 1

t= this means you are assigning to local variable t the current constructor object. this refers to the current object.

Answer 2

this always refers to the current object , you can refer here

What does t=this do in this code?

It will assign the provided reference of t to the current object.

I know this normally refers to the starting variable in top but int his case it looks like it does nothing ?

No, you are wrong, this does NOT refer to the starting variable in top, rather as mentioned above, it refers to the current object.

The most common usage of this is to initialize the variables of an object by using the constructor, as shown below:

public class Try {
    String name; //initialize using constructor
    int age; //initialize using constructor

    //constructor
    public Try(String name, int age) {
        this.name = name; //assigns passed name value to current object's name
        this.age = age; //assigns passed age value to current object's age
    }
}

So It doesn't point to any address in data?

this holds the reference (think like a pointer in C ) of the current object.

If we assign two objects called t1 and t2 and say : t1=t2 it point to that address am I right? but not in this case?

Yes, if you assign t1=t2 then you are making t1 to point to the same object as t2 ie, both t1 and t2 refer the same object on the heap.