Is there an Equivalent of .Net framework's Random.Next(Int32, Int32) in the Java API ?

Question

I am working on porting an existing VB.Net application to Java, and could not find an equivalent to Random.Next(Int32, Int32).

I could find only "java.util.Random.next(int val)" in the Java API.

Is there an Equivalent of .Net framework's Random.Next(Int32, Int32) in the Java API?

• Thanks,

Answer 1

Well, you can use Random.nextInt(int) specifying the range, and then just add the minimum value? i.e. rand.nextInt(12) + 5

Answer 2

no but you can have it this way:

public static int randomInRange(int min, int max){
      return min+Random.next(max-min);
}

Answer 3

As Marc says, just adapt Random.nextInt(int), with a couple of sanity checks:

public static int nextInt(Random rng, int lower, int upper) {
    if (upper < lower) {
        throw new IllegalArgumentException();
    }
    if ((long) upper - lower > Integer.MAX_VALUE) {
        throw new IllegalArgumentException();
    }
    return rng.nextInt(upper-lower) + lower;
}

Answer 4

Call to Random.Next(x, y) can be translated to something like Random.nextInt(y - x) + x;

Answer 5

Consider RandomUtils from Apache Commons Lang:

http://commons.apache.org/lang/apidocs/org/apache/commons/lang/math/RandomUtils.html

Answer 6

Not a built-in function, but it's easy enough to do. See the correct answer listed here.