Check out example codes for "android studio java random number generator". It will help you in understanding the concepts better.

Code Example 1

final int min = 20;
final int max = 80;
final int random = new Random().nextInt((max - min) + 1) + min;

Code Example 2

final int random = new Random().nextInt(61) + 20; // [0, 60] + 20 => [20, 80]

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