java random numbers in specific range
import java.util.Random;
Random rand = new Random();
int random_integer = rand.nextInt(upperbound-lowerbound) + lowerbound;java random numbers in specific range
import java.util.Random;
Random rand = new Random();
int random_integer = rand.nextInt(upperbound-lowerbound) + lowerbound;how to get random number in java in range
private static int getRandomNumberInRange(int min, int max)
{
if (min >= max) {
throw new IllegalArgumentException("max must be greater than min");
}
Random r = new Random();
return r.nextInt((max - min) + 1) + min;
}
//Random().nextInt(int bound) = Random integer from 0 (inclusive) to bound (exclusive)
//1. nextInt(range) = nextInt(max - min)
new Random().nextInt(5); // [0...4] [min = 0, max = 4]
new Random().nextInt(6); // [0...5]
new Random().nextInt(7); // [0...6]
new Random().nextInt(8); // [0...7]
new Random().nextInt(9); // [0...8]
new Random().nextInt(10); // [0...9]
new Random().nextInt(11); // [0...10]
//2. To include the last value (max value) = (range + 1)
new Random().nextInt(5 + 1) // [0...5] [min = 0, max = 5]
new Random().nextInt(6 + 1) // [0...6]
new Random().nextInt(7 + 1) // [0...7]
new Random().nextInt(8 + 1) // [0...8]
new Random().nextInt(9 + 1) // [0...9]
new Random().nextInt(10 + 1) // [0...10]
new Random().nextInt(11 + 1) // [0...11]
//3. To define a start value (min value) in a range,
// For example, the range should start from 10 = (range + 1) + min
new Random().nextInt(5 + 1) + 10 // [0...5] + 10 = [10...15]
new Random().nextInt(6 + 1) + 10 // [0...6] + 10 = [10...16]
new Random().nextInt(7 + 1) + 10 // [0...7] + 10 = [10...17]
new Random().nextInt(8 + 1) + 10 // [0...8] + 10 = [10...18]
new Random().nextInt(9 + 1) + 10 // [0...9] + 10 = [10...19]
new Random().nextInt(10 + 1) + 10 // [0...10] + 10 = [10...20]
new Random().nextInt(11 + 1) + 10 // [0...11] + 10 = [10...21]
// Range = (max - min)
// So, the final formula is ((max - min) + 1) + min
//4. Test [10...30]
// min = 10 , max = 30, range = (max - min)
new Random().nextInt((max - min) + 1) + min
new Random().nextInt((30 - 10) + 1) + 10
new Random().nextInt((20) + 1) + 10
new Random().nextInt(21) + 10 //[0...20] + 10 = [10...30]
//5. Test [15...99]
// min = 15 , max = 99, range = (max - min)
new Random().nextInt((max - min) + 1) + min
new Random().nextInt((99 - 15) + 1) + 15
new Random().nextInt((84) + 1) + 15
new Random().nextInt(85) + 15 //[0...84] + 15 = [15...99]
//Done, understand?java generate random integer in range
import java.util.concurrent.ThreadLocalRandom;
// nextInt is normally exclusive of the top value,
// so add 1 to make it inclusive
int randomNum = ThreadLocalRandom.current().nextInt(min, max + 1);Copyright © 2021 Codeinu
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