Most efficient way to convert java.lang.Long to primitive int

Question

I have a weird scenario where I need to convert several million java.lang.Longs into primitive int types. I need to do this several times a day, every single day. Normally, I wouldn't worry about this kind of simple casting, but since it's happening so much, so often, I have to ask: what's the most efficient way to do this, and why?

My first attempt:

Long myLong = getLong();
int x = Integer.valueOf(myLong.toString())

Although this seems like going 3 sides around the barn. Thanks in advance.

Solution 1

The Long class has an .intValue() method, I guess this is what you are looking for...

(warning, you may lose precision etc etc -- but you probably know that already)

Solution 2

Try this

int x = myLong.intValue( );

Comments

[MrSmith42]

WARNING: Value of Long may not fit in an int

[Dave Newton]

Just use intValue(), and recognize you'll lose data unless your longs are restricted.

[MrSmith42]

Do not convert Long to String and tha parse it to get an int.

[MrSmith42]

If your values fit in an int, replace your Long variables by Integer

[Alexander Pogrebnyak]

Why -1? Problem is well defined and code sample is given.

[Anand]

I am getting the error: Cannot invoke intValue() on the primitive type long

[Alexander Pogrebnyak]

@Anand. myLong has to be declared as Long not long. For latter case just cast it, i.e. (int) myPrimitiveLong.