Creating object with new Object{}

Question

Could you please explain how this construction actually works and what does it mean?

var newObj = new Object () {
  public String s = "test";
  public int i = 1;
};

What's the class of newObj and how it was created?

newObj is an instance of anonymous class that extends Object class. — ChipLimo, Mar 05 '19 at 08:09
@user207421 [It compiles fine](https://tio.run/##TY2xDoMwDERn8hUWEwyN1Bn1E6oOjBWDCRFKGgLChqqq@PbUiFbqYp/u3dkeVzz57pHStLTBGTABieCKLsJbZV@TGFnWOroOBkFFzbOL/b0BnHsq92S24gzRPm@th8suQJQ1DMWBf6eOJpCEcrbEefUHXWRwQs67uVVKZv0itoMeF9aTNDnE4viiqZTUpraUPg). — Ivar, Mar 05 '19 at 08:47

score 1 · Accepted Answer · edited Mar 05 '19 at 08:19

1

The class of the newObj is an Anonymous Inner Class. Here you define this anonymous inner class inside the curly brace {}.

An anonymous inner class can be useful when making an instance of an object with certain “extras” such as overloading methods of a class or interface, without having to actually subclass a class.

Also, the newObj reference refers, not to an instance of Object but to an instance of an anonymous subclass of Object.

edited Mar 05 '19 at 08:19

user207421

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answered Mar 05 '19 at 08:18

Andrianekena Moise

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That is the only really interesting part: because of `var`, the compiler can now "track" that you are extending Object, so when you put a new method into that class, you can later invoke it. – GhostCat Mar 05 '19 at 08:23

Creating object with new Object{}

1 Answers1