Integer to two digits hex in Java

Question

I need to change a integer value into 2-digit hex value in Java.Is there any way for this. Thanks

My biggest number will be 63 and smallest will be 0. I want a leading zero for small values.

Answer 1

String.format("%02X", value); 

If you use X instead of x as suggested by aristar, then you don't need to use .toUpperCase().

Answer 2

Integer.toHexString(42); 

Javadoc: http://docs.oracle.com/javase/6/docs/api/java/lang/Integer.html#toHexString(int)

Note that this may give you more than 2 digits, however! (An Integer is 4 bytes, so you could potentially get back 8 characters.)

Here's a bit of a hack to get your padding, as long as you are absolutely sure that you're only dealing with single-byte values (255 or less):

Integer.toHexString(0x100 | 42).substring(1) 

Many more (and better) solutions at Left padding integers (non-decimal format) with zeros in Java.