Random Numbers in CLIPS

Our program will demonstrate how to generate random numbers in Java. Here’s the full source code:

import java.util.Random;

public class RandomNumbers {
    public static void main(String[] args) {
        // Create a new Random object
        Random rand = new Random();

        // For example, nextInt(100) returns a random int n,
        // 0 <= n < 100.
        System.out.print(rand.nextInt(100) + ",");
        System.out.println(rand.nextInt(100));

        // nextDouble() returns a double f,
        // 0.0 <= f < 1.0.
        System.out.println(rand.nextDouble());

        // This can be used to generate random doubles in
        // other ranges, for example 5.0 <= f' < 10.0.
        System.out.print((rand.nextDouble() * 5) + 5 + ",");
        System.out.println((rand.nextDouble() * 5) + 5);

        // If you want a known seed, create a new
        // Random object with a specific seed.
        Random r2 = new Random(42);
        System.out.print(r2.nextInt(100) + ",");
        System.out.println(r2.nextInt(100));

        // Creating another Random object with the same seed
        // will produce the same sequence of numbers.
        Random r3 = new Random(42);
        System.out.print(r3.nextInt(100) + ",");
        System.out.println(r3.nextInt(100));
    }
}

To run the program, compile and execute it:

$ javac RandomNumbers.java
$ java RandomNumbers
68,56
0.8090228139659177
5.840125017402497,6.937056298890035
94,49
94,49

Some of the generated numbers may be different when you run the sample, except for the ones generated with a specific seed.

Note that Java’s Random class uses a different algorithm than Go’s math/rand/v2 package, so the exact numbers generated will be different. However, the concept of pseudorandom number generation is the same.

Java’s Random class doesn’t have a direct equivalent to Go’s PCG (Permuted Congruential Generator). If you need a more advanced random number generator in Java, you might want to look into third-party libraries or implement your own.

See the Java Random class documentation for references on other random quantities that Java can provide.

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Random Numbers in CLIPS