Generate Infinite Stream of Integers in Java

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

This can be done in following ways:

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

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

  Output:

  0
  1
  2
  3
  4
  5
  .
  .
  .
  

• Using Random.ints():
  1. Get the next integer using ints() method
  2. Print the IntStream 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 integer
              // using ints() method
              .ints()
  
              // Print the IntStream
              // using forEach() method.
              .forEach(System.out::println);
      }
  }

  Output:

  -1214876682
  911266110
  1224044471
  -1867062635
  1893822159
  1226183018
  741533414
  .
  .
  .
  

• Using IntStream.generate():
  1. Generate the next integer using IntStream.generate() and Random.nextInt()
  2. Print the IntStream 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();
  
          IntStream
  
              // Generate the next integer
              // using IntStream.generate()
              // and Random.nextInt()
              .generate(random::nextInt)
  
              // Print the IntStream
              // using forEach() method.
              .forEach(System.out::println);
      }
  }

  Output:

  -798555363
  -531857014
  1861939261
  273120213
  -739170342
  1295941815
  870955405
  -631166457
  .
  .
  .