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Generating random numbers in Java
We can generate random numbers using three ways in Java.
Using java.util.Random class − Object of Random class can be used to generate random numbers using nextInt(), nextDouble() etc. methods.
Using java.lang.Math class − Math.random() methods returns a random double whenever invoked.
Using java.util.concurrent.ThreadLocalRandom class − ThreadLocalRandom.current().nextInt() method and similar othjer methods return a random numbers whenever invoked.
Example
import java.util.Random;
import java.util.concurrent.ThreadLocalRandom;
public class Tester {
public static void main(String[] args) {
generateUsingRandom();
generateUsingMathRandom();
generateUsingThreadLocalRandom();
}
private static void generateUsingRandom() {
Random random = new Random();
//print a random int within range of 0 to 10.
System.out.println(random.nextInt(10));
//print a random int
System.out.println(random.nextInt());
//print a random double
System.out.println(random.nextDouble());
}
private static void generateUsingMathRandom() {
//print a random double
System.out.println(Math.random());
}
private static void generateUsingThreadLocalRandom() {
//print a random int within range of 0 to 10.
System.out.println(ThreadLocalRandom.current().nextInt(10));
//print a random int
System.out.println(ThreadLocalRandom.current().nextInt());
//print a random double
System.out.println(ThreadLocalRandom.current().nextDouble());
}
}Output
9 -1997411886 0.7272728969835154 0.9400193333973254 6 852518482 0.13628495782770622
Updated on: 21-Jun-2020
1K+ Views
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