Generating Random Numbers

Generating Random Numbers

The java.util package contains a class called Random which you can useto generate random numbers. A Random object represents a repeatingpseudo-random sequence of numbers. You can either fetch the next actualpseudo-random number with the next() method or fetch a uniformly distributedfloat, double, int, or long value using nextFloat(), nextDouble(), nextInt(),or nextLong(). However, you have to convert these uniformly distributedvalues into something you can use. nextFloat() and nextDouble() returnvalues between 0.0 and 1.0, which can be used to generate random integersin a set range as demonstrated by this example:

 import java.util.*;public final class PrintRandom {  public static final void main(String[] args) {    Random random;    double d;    int minValue, maxValue;    random = new Random(System.currentTimeMillis());    minValue = Integer.parseInt(args[0]);    maxValue = Integer.parseInt(args[1]);    d = (maxValue - minValue + 1);    d*=random.nextDouble();    System.out.println(minValue + (int)d);  }}
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