Java Random class

Java Random class is used to generate a stream of pseudorandom numbers. The algorithms implemented by Random class use a protected utility method than can supply up to 32 pseudorandomly generated bits on each invocation.

Methods

Methods	Description
doubles()	Returns an unlimited stream of pseudorandom double values.
ints()	Returns an unlimited stream of pseudorandom int values.
longs()	Returns an unlimited stream of pseudorandom long values.
next()	Generates the next pseudorandom number.
nextBoolean()	Returns the next uniformly distributed pseudorandom boolean value from the random number generator's sequence
nextByte()	Generates random bytes and puts them into a specified byte array.
nextDouble()	Returns the next pseudorandom Double value between 0.0 and 1.0 from the random number generator's sequence
nextFloat()	Returns the next uniformly distributed pseudorandom Float value between 0.0 and 1.0 from this random number generator's sequence
nextGaussian()	Returns the next pseudorandom Gaussian double value with mean 0.0 and standard deviation 1.0 from this random number generator's sequence.
nextInt()	Returns a uniformly distributed pseudorandom int value generated from this random number generator's sequence
nextLong()	Returns the next uniformly distributed pseudorandom long value from the random number generator's sequence.
setSeed()	Sets the seed of this random number generator using a single long seed.

Example 1

import java.util.Random;
public class JavaRandomExample1 {
    public static void main(String[] args) {
        //create random object
        Random random= new Random();
        //returns unlimited stream of pseudorandom long values
            System.out.println("Longs value : "+random.longs());
       // Returns the next pseudorandom boolean value
        boolean val = random.nextBoolean();
        System.out.println("Random boolean value : "+val);
        byte[] bytes = new byte[10];
        //generates random bytes and put them in an array
        random.nextBytes(bytes);
        System.out.print("Random bytes = ( ");
        for(int i = 0; i< bytes.length; i++)
        {
            System.out.printf("%d ", bytes[i]);
        }
        System.out.print(")");
    }
}

Test it Now

Output:

Longs value : java.util.stream.LongPipeline$Head@14ae5a5
Random boolean value : true
Random bytes = ( 57 77 8 67 -122 -71 -79 -62 53 19 )

Example 2

import java.util.Random;
public class JavaRandomExample2 {
   public static void main(String[] args) {
      Random random = new Random();
      //return the next pseudorandom integer value
      System.out.println("Random Integer value : "+random.nextInt());
      // setting seed
      long seed =20;
      random.setSeed(seed);
      //value after setting seed
      System.out.println("Seed value : "+random.nextInt());
      //return the next pseudorandom long value
      Long val = random.nextLong();
      System.out.println("Random Long value : "+val);
   }
}

Test it Now

Output:

Random Integer value : 1294094433
Seed value : -1150867590
Random Long value : -7322354119883315205

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