Java - 4 different ways to generate random double in range

public static double nextDoubleBetween(double min, double max) {

    return (ThreadLocalRandom.current().nextDouble() * (max - min)) + min;

}

System.out.println(nextDoubleBetween(4.0d, 8.0d));     // 7.413037434364464

System.out.println(nextDoubleBetween(100.0d, 900.0d)); // 847.7762445206072

System.out.println(nextDoubleBetween(-6.5d, -3.5d));   // -4.858339745847818

public static double nextDoubleBetween2(double min, double max) {

    return (new Random().nextDouble() * (max - min)) + min;

}

System.out.println(nextDoubleBetween2(4.0d, 8.0d));     // 4.052304029464722

System.out.println(nextDoubleBetween2(100.0d, 900.0d)); // 768.620491027832

System.out.println(nextDoubleBetween2(-6.5d, -3.5d));   // -5.824402153491974

public static double nextDoubleBetween3(double min, double max) {

    // java 8 + DoubleStream

    return new Random().doubles(min, max).limit(1).findFirst().getAsDouble();

}

System.out.println(nextDoubleBetween3(4.0d, 8.0d));     // 5.957144260406494

System.out.println(nextDoubleBetween3(100.0d, 900.0d)); // 859.1829833984375

System.out.println(nextDoubleBetween3(-6.5d, -3.5d));   // -4.081723213195801

public static double nextDoubleBetween4(double min, double max) {

    return (Math.random() * (max - min)) + min;

}

System.out.println(nextDoubleBetween4(4.0d, 8.0d));     // 5.137720584869385

System.out.println(nextDoubleBetween4(100.0d, 900.0d)); // 603.9947204589844

System.out.println(nextDoubleBetween4(-6.5d, -3.5d));   // -4.018362045288086

public static void testDoubleInRange() {

    List<Double> list = new ArrayList<>();

    for (int i = 0; i < 2000; i++) {

        double rand = nextDoubleBetween(2.0d, 4.0d);

        //double rand = nextDoubleBetween2(2.0d, 4.0d);

        //double rand = nextDoubleBetween3(2.0d, 4.0d);

        //double rand = nextDoubleBetween4(2.0d, 4.0d);

        list.add(rand);

    }

    list.sort(Double::compareTo);

​

    // print 2000 sorted doubles in asc order

    list.forEach(System.out::println);

}

​

public static void main(String[] args) {

    testDoubleInRange();

}

2.0010556305772016

2.0012970579895804

2.001744530227831

2.002021244118838

2.003799609313888

...

3.9969095941710693

3.9974610558327024

3.9980601986911837

3.998751363307557

3.999256829257631