Can a Java object pass itself an instance of itself

I have a class called SomeClass which has a method called methodToCall(SomeClass o)

If I instantiate SomeClass like this:

SomeClass itsObject = new SomeClass();

Can I then do this:

itsObject.method开发者_开发知识库ToCall(itsObject);

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Absolutely. How that will behave will depend on the implementation, of course.

Just as an example, equals is defined to be reflexive, such that:

x.equals(x)

should always return true (assuming x is non-null).

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Yes, you can.

One (contrived) example:

BigInteger one = BigInteger.ONE;
BigInteger two = one.add(one);

(You should try these things in your IDE - it takes less time than writing a question)

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Yes. There is nothing that prevents you doing this.

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It would be by default,
you don't need to specify it. in method body you can refer it as this

Note: method should not be static

and if you want to externally specify you can do it simple.

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Yes, you can do this, as long as methodToCall accepts an object of type SomeClass(or a class deriving from SomeClass) as a parameter:

public void methodToCall(SomeClass parameter){.....}

You can call it from outside your class:

yourObject.methodToCall(yourObject)

or from within the class, using this :

public class SomeClass{
    ...
    public void AnotherMethod(SomeClass parameter)
    {
       this.methodToCall(this);
    }
    ...
}