Functional Programming - Fixed length Streams


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There are multiple ways using which we can create fix length streams.

  • Using Stream.of() method

  • Using Collection.stream() method

  • Using Stream.builder() method

Following example shows all of the above ways to create a fix length stream.

Example - Fix Length Stream

import java.util.Arrays;
import java.util.List;
import java.util.stream.Stream;

public class FunctionTester {    
   public static void main(String[] args) {

      System.out.println("Stream.of():");
      Stream<Integer> stream  = Stream.of(1, 2, 3, 4, 5);       
      stream.forEach(System.out::println);

      System.out.println("Collection.stream():");
      Integer[] numbers = {1, 2, 3, 4, 5};     
      List<Integer> list = Arrays.asList(numbers);
      list.stream().forEach(System.out::println);

      System.out.println("StreamBuilder.build():");
      Stream.Builder<Integer> streamBuilder = Stream.builder();
      streamBuilder.accept(1);
      streamBuilder.accept(2);
      streamBuilder.accept(3);
      streamBuilder.accept(4);
      streamBuilder.accept(5);
      streamBuilder.build().forEach(System.out::println);    
   }   
}

Output

Stream.of():
1
2
3
4
5
Collection.stream():
1
2
3
4
5
StreamBuilder.build():
1
2
3
4
5
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