Java 17 Recipes

2-8. Pseudorandom Number Generators
 Problem
You want to create random numbers.
 Solution
Java 17 improves the functionality by providing new interface types and implementations 
for pseudorandom number generators (PRNGs) and preserving previous behavior of the 
java.util.Random class.
An example is the creation of a pseudorandom integer number.
import java.util.random.RandomGenerator;
import java.util.Random;
public class UseNewPRNGs implements RandomGenerator {
static UseNewPRNGs testGen = new UseNewPRNGs();
public static void main(String[] args){
for (int i = 0; i < 5; i++) {
System.out.println(testGen.nextBoolean());
System.out.println(testGen.nextDouble());
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System.out.println(testGen.nextInt());
System.out.println(testGen.nextLong());
}
}
@Override
public long nextLong() {
//Returns a pseudorandomly chosen long value.
Random r= new Random();
return r.nextLong();
}
}
The following is the output.
false
0.4134883035327678
1576006117
7534183938614386691
true
0.37651481128199904
682788707
-6435840544183136500
true
0.8508900370304876
833362345
45614195681877909
true
0.10116382711133465
-663894214
-3718926050146429223
false
0.01988848947697064
1224659827
-2167276196617947918
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 How It Works
Java 17 provides a new interface, RandomGenerator, which supplies a uniform API 
for all existing and new PRNGs. It has default methods, and in the previous code was 
only overridden the nextLong method. It provides a common protocol for objects 
that generate random or pseudorandom sequences of numbers or Boolean values. 
This enhancement mainly aims to use various PRNG algorithms interchangeably in 
applications and preserve the existing behavior of the java.util.Random class.
For more information on PRNGs, see the documentation at 
https://openjdk.java 
.net/jeps/356
.