Program to convert Primitive Array to Stream in Java

An array is a group of like-typed variables that are referred to by a common name. An array can contain primitives data types as well as objects of a class depending on the definition of the array. In case of primitives data types, the actual values are stored in contiguous memory locations. In case of objects of a class, the actual objects are stored in heap segment.

A Primitive array is an array which is defined with the help of the primitive wrapper classes, instead of objects.
Example: Integer a = new Integer(4);

When a Primitive Array is converted into a Stream, primitive Streams will be obtained like IntStream, DoubleStream and LongStream.

Examples:

Input: Double Array: [1.2, 2.4, 3.6, 4.8, 5.0]
Output: DoubleStream: [1.2, 2.4, 3.6, 4.8, 5.0]

Input: Integer Array: [1, 2, 3, 4, 5]
Output: IntStream: [1, 2, 3, 4, 5]

Below are methods to convert Primitive Array to Stream in Java:

1. Using Arrays.stream():

   Algorithm:

   1. Get the Array to be converted.
   2. Convert the array into Stream using Arrays.stream() method by passing the array as the parameter.
   3. Return the formed Stream

   Program:

   // Java Program to convert
   // Array to Stream
   
   import java.util.*;
   import java.util.stream.*;
   
   class GFG {
   
       // Generic function to convert
       // an Array to Stream
       public static IntStream
                   convertArrayToStream(int array[])
       {
   
           // Return the converted Stream
           return Arrays.stream(array);
       }
   
       public static void main(String args[])
       {
           // Create an Array
           int[] array = new int[] { 3, 2, 5, 4, 1 };
   
           // Print the Array
           System.out.println("Array: "
                       + Arrays.toString(array));
   
           // convert the Array to Stream
           IntStream stream = convertArrayToStream(array);
   
           // Print the Stream
           System.out.println("Stream: "
                       + Arrays.toString(stream.toArray()));
       }
   }
   Output:

   Array: [3, 2, 5, 4, 1]
   Stream: [3, 2, 5, 4, 1]
   

2. Using IntStream.of(): The IntStream.of() method creates a Stream directly with the primitive values or collection passed as the parameter.

   Algorithm:

   1. Get the Array to be converted.
   2. Convert the array into Stream using IntStream.of() method by passing the array as the parameter.
   3. Return the formed Stream

   Program:

   // Java Program to convert
   // Array to Stream
   
   import java.util.*;
   import java.util.stream.*;
   
   class GFG {
   
       // Generic function to convert
       // an Array to Stream
       public static IntStream
                  convertArrayToStream(int array[])
       {
   
           // Return the converted Stream
           return IntStream.of(array);
       }
   
       public static void main(String args[])
       {
           // Create an Array
           int[] array = new int[] { 3, 2, 5, 4, 1 };
   
           // Print the Array
           System.out.println("Array: "
                         + Arrays.toString(array));
   
           // convert the Array to Stream
           IntStream stream = convertArrayToStream(array);
   
           // Print the Stream
           System.out.println("Stream: "
                         + Arrays.toString(stream.toArray()));
       }
   }
   Output:

   Array: [3, 2, 5, 4, 1]
   Stream: [3, 2, 5, 4, 1]