How do you increment a hex value in java and keep the padding at

Question

Editorial Team

Asked: June 13, 20262026-06-13T12:36:59+00:00 2026-06-13T12:36:59+00:00

How do you increment a hex value in java and keep the padding at the same time?

If you look at this:

You’ll see a variable called “keyHex” in the correct answer which represents hex but in string format and padded by a bunch of zeros.

Then I want to increment “keyHex” by 1 and change it from:

"00000000000000000000000000000000"

to

"00000000000000000000000000000001"

I want to keep looping and adding 1 until I reach:

"00000000000000000000000000FFFFFF"

For obvious reasons I cannot do “keyHex++”, so I would appreciate it if someone can point me in the right direction.

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Editorial Team · Answer 1 · 2026-06-13T12:37:00+00:00

Editorial Team

Well what you should keep track of is the integer value of keyHex and then simply output it like this:

String.format("%033x", keyHex);

You could parse keyHex to an integer first if you need to as well..
This link may be more help for that: Java – parse and unsigned hex string into a signed long

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