Strange code

[Nick Petas]

I stumbled uppon this code :

new ClassName(this)
        .setMethod1()
        .setMethod2()
        .Method3();

Is it valid code and what exactly does it do?
Thank you.

[Jesper de Jong]

What exactly do you find strange about it?

You can write it on one line:

new ClassName(this).setMethod1().setMethod2().Method3();

It does the same as this:

ClassName a = new ClassName(this);
ClassName b = a.setMethod1();
ClassName c = b.setMethod2();
c.Method3();

As you know, you use the "." syntax to call a method on an object: variable name, dot, method name, parentheses, semi-colon. If the method returns something, you can assign the return value to a variable. Then on that variable you can again call a method.

You can also do this in one go. So, for example the expression new ClassName(this) gives you a ClassName object; you don't need to assign that to a variable first, you can directly call a method on it by putting a "." and the method name after it: new ClassName(this).setMethod1();. And the method call in turn can return an object, on which you can again call a method directly. So you can chain multiple method calls like that.

[Nick Petas]

Oh yes of course.
Now I get it.
Thanks a lot for the rapid answer!