Integer variable

[Vidhya Ramaswamy]

Hi,

I am preparing for SCJP 1.5 exam.

I have a query: The following lines of code compiles fine.

int i1 = 2000;
Integer var = i1;

I was expecting it should have been : Integer var = new Integer(i1)

Please explain.
Thanks in advance,
Vidhya

[Pranav Bhatt]

Vidhya,
You would be using Java 5. So in Java 5 it automatically wraps the int literal i1 into the wrapper class(Integer here) object(autoboxing). Whereas if you try this in Java 4 it will throw an error unless you give new to it.
Thanks.

[Jesper de Jong]

This is because of autoboxing, one of the new features of Java 5.

[Vidhya Ramaswamy]

Thanks for your replies

Vidhya

[Manikandan Jayaraman]

Though this looks programmer-friendly, I would say that it is conceptually wrong.

Future generation of programmers might not get the TRUE ESSENCE of Objects and Primitives and what they actually mean.

For that matter I also heard that Java 8 or 9 targets on XML to write java programs. This also makes java executions faster it seems.

All targets now on programmer's convenience.