Create object of class of another object

Question

Is it possible to use constructor of class of diffrent object? Imagine two classes: A and B extends A. We make object

A x = new B(arg);

And then (pseudo-code!)

A y = new (x.getClass())(arg);

Can I reach this effect without iffing and casing through all possible inheritors of A?

You can create an instance of super class with new subclass(). But in other case no. — seenukarthi, Aug 17 '15 at 14:39

Mordechai · Accepted Answer · 2015-08-18T12:19:32.730

2

Reflection is probably what you want, still it's not encouraged:

A y = x.getClass().getConstructor(ArgType.class).newInstance(args);

Will create a new instance of B.

_{_{credits for @Hogler, for pointing out a mistake.}}

edited Aug 18 '15 at 12:19

answered Aug 17 '15 at 14:45

Mordechai

Does not work: the method newInstance() (...) is not applicable for argument (EgClass) – radrow Aug 17 '15 at 15:19
2

`x.getClass().getConstructor(TypeOfArg.class).newInstance(arg);`… – Holger Aug 17 '15 at 15:21
This is exactly what i needed – radrow Aug 17 '15 at 15:34

score 0 · Answer 2 · edited May 23 '17 at 11:51

0

You can typecast the object if one object inherits the other. Look at this link for more information: Casting objects in Java

edited May 23 '17 at 11:51

Community

answered Aug 17 '15 at 14:40

ksivakumar

2 Answers2