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]