Generate Infinite Stream of Double in Java

Given the task is to generate an infinite sequential unordered stream of double in Java.

This can be done in following ways:

• Using DoubleStream.iterate():
  1. Using the DoubleStream.iterate() method, iterate the DoubleStream with i by incrementing the value with 1.
  2. Print the DoubleStream with the help of forEach() method.

  import java.util.stream.*;
  
  public class GFG {
  
      // Main method
      public static void main(String[] args)
      {
  
          DoubleStream
  
              // Iterate the DoubleStream with i
              // by incrementing the value with 1
              .iterate(0, i -> i + 1)
  
              // Print the DoubleStream
              // using forEach() method.
              .forEach(System.out::println);
      }
  }

  Output:

  0.0
  1.0
  2.0
  3.0
  4.0
  5.0
  6.0
  .
  .
  .
  

• Using Random.doubles():
  1. Get the next double using doubles() method
  2. Print the DoubleStream with the help of forEach() method.

  import java.util.stream.*;
  import java.util.*;
  
  public class GFG {
  
      // Main method
      public static void main(String[] args)
      {
  
          // Create a Random object
          Random random = new Random();
  
          random
  
              // Get the next double
              // using doubles() method
              .doubles()
  
              // Print the DoubleStream
              // using forEach() method.
              .forEach(System.out::println);
      }
  }

  Output:

  0.3668625445505631
  0.4385898887922953
  0.23333911864591927
  0.7134958163360963
  0.6945667694181287
  0.6898427735417596
  0.9243923588584183
  .
  .
  .
  

• Using DoubleStream.generate() method:
  1. Generate the next double using DoubleStream.generate() and Random.nextDouble()
  2. Print the DoubleStream with the help of forEach() method.

  import java.util.stream.*;
  import java.util.*;
  
  public class GFG {
  
      // Main method
      public static void main(String[] args)
      {
  
          // Create a Random object
          Random random = new Random();
  
          DoubleStream
  
              // Generate the next double
              // using DoubleStream.generate()
              // and Random.nextDouble()
              .generate(random::nextDouble)
  
              // Print the DoubleStream
              // using forEach() method.
              .forEach(System.out::println);
      }
  }

  Output:

  0.025801080723973246
  0.5115037630832635
  0.030815898624858784
  0.5441584143944648
  0.6984267528746901
  0.5821292304544626
  .
  .
  .