How to produce an integer that is always positive?

Hi guys,
Below is my code, and im stuck. I want that its output is always positive, like in Math, we have something like this,
a = | -450 | = 450
int randInt = random.nextInt(237);
int test = (Host_2_UptimeVal * 3600) - randInt;Thanks.

Math.abs(....);

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How to produce an integer that is always positive?

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