Java initializing an integer and adding it to a list in one line

Question

A tiny annoyance I have in my code right now - these two lines of code:

int i = 1;
listOfIntegers.add(i);

I would really like these to be one line but I can't for the life of me find anything like "new int[] {1}" or similar. Is this possible?

libik · Accepted Answer · 2015-03-10 00:08:37Z

1

Yes, it is, and it is as easy as possible :)

listOfIntegers.add(1);

PS : For primitive data types you dont have to create "instances" of them, they are instances itself.

answered Mar 10, 2015 at 0:08

libik

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3 Comments

Klaabu Over a year ago

oh. OH. Bloody of course. The actual number is not so much 1 as it is a integer returned by a method but I can just as easily just... yes. I feel a bit silly now, thanks for the help.

libik Over a year ago

@Klaabu - that happens :D, btw : you can even store a results of expressions by same approach. For example listOfIntegers.add(9-8); do the same as listOfIntegers.add(1);

Kevin Day Over a year ago

Note that this code is using the auto-boxing feature of Java (auto-converting int into Integer). This is fine, but it's important to know what is going on behind the scenes. This article has some common gotchas: certpal.com/blogs/2009/08/autoboxing-unboxing-gotchas

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