Array to Stream in Java

Prerequisite : Stream In Java

Using Arrays.stream() :

Syntax :

public static <T> Stream<T> getStream(T[] arr)
{
  return Arrays.stream(arr);
}

where, T represents generic type.

Example 1 : Arrays.stream() to convert string array to stream.

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// Java code for converting string array
// to stream using Arrays.stream()
import java.util.*;
import java.util.stream.*;
  
class GFG {
  
    public static void main(String[] args)
    {
        // Converting String array to stream
        String[] arr = { "Geeks", "for", "Geeks" };
  
        // Using Arrays.stream to convert an
        // array into Stream
        Stream<String> stm = Arrays.stream(arr);
  
        // Displaying elements in Stream
        stm.forEach(str -> System.out.print(str + " ")); 
    }
}

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Output:


Geeks for Geeks 





Example 2 : Arrays.stream() to convert int array to stream.











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// Java code for converting string array 


// to stream using Arrays.stream() 


import java.util.*; 


import java.util.stream.*; 


  


class GFG { 


  


    public static void main(String[] args) 


    { 


        // Converting int array to stream 


        int arr[] = { 1, 2, 3, 4, 5 }; 


  


        IntStream stm = Arrays.stream(arr); 


  


        stm.forEach(a -> System.out.print(a + " ")); 


   } 


} 



















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Output:


1 2 3 4 5 





Example 3 : Arrays.stream() to convert long and double arrays to stream.











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// Java code for converting string array 


// to stream using Arrays.stream() 


import java.util.*; 


import java.util.stream.*; 


  


class GFG { 


  


    public static void main(String[] args) 


    {        // Converting long array to stream 


        long[] arrL = { 3L, 5L, 6L, 8L, 9L }; 


        LongStream stmL = Arrays.stream(arrL); 


        stmL.forEach(number -> System.out.print(number + " ")); 


  


        System.out.println(); 


  


        // Converting double array to stream 


        double[] arrD = { 1, 2, 3, 4, 5 }; 


        DoubleStream stmD = Arrays.stream(arrD); 


        stmD.forEach(d -> System.out.print(d + " ")); 


    } 


} 



















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Output:



Output:


3 5 6 8 9 
1.0 2.0 3.0 4.0 5.0 





Using Stream.of(), IntStream.of(),  LongStream.of() & DoubleStream.of()  : 


Syntax :


public static <T> Stream<T> getStream(T[] arr)
{
  return Stream.of(arr);
}

where, T represents generic type.

Syntax of other functions is similar



Note : For object arrays, Stream.of() internally uses Arrays.stream().


Example 1 : Arrays.stream() to convert string array to stream.











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// Java code for converting string array 


// to stream using Stream.of() 


import java.util.*; 


import java.util.stream.*; 


  


class GFG { 


  


    public static void main(String[] args) 


    { 


        // Converting String array to stream 


        String[] arr = { "Geeks", "for", "Geeks" }; 


  


        // Using Arrays.stream to convert an 


        // array into Stream 


        Stream<String> stm = Stream.of(arr); 


  


        // Displaying elements in Stream 


        stm.forEach(str -> System.out.print(str + " "));  


    } 


} 



















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Output:


Geeks for Geeks 





Example 2 : Arrays.stream() to convert int array to stream.











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// Java code for converting string array 


// to stream using IntStream.of() 


import java.util.*; 


import java.util.stream.*; 


  


class GFG { 


  


    public static void main(String[] args) 


    { 


        // Converting int array to stream 


        int arr[] = { 1, 2, 3, 4, 5 }; 


  


        IntStream stm = IntStream.of(arr); 


  


        stm.forEach(a -> System.out.print(a + " ")); 


   } 


} 



















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Output:


1 2 3 4 5 





Example 3 : Arrays.stream() to convert long and double arrays to stream.











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// Java code for converting string array 


// to stream using  DoubleStream.of() 


import java.util.*; 


import java.util.stream.*; 


  


class GFG { 


  


    public static void main(String[] args) 


    {        // Converting long array to stream 


        long[] arrL = { 3L, 5L, 6L, 8L, 9L }; 


        LongStream stmL = LongStream.of(arrL); 


        stmL.forEach(number -> System.out.print(number + " ")); 


  


        System.out.println(); 


  


        // Converting double array to stream 


        double[] arrD = { 1, 2, 3, 4, 5 }; 


        DoubleStream stmD = DoubleStream.of(arrD); 


        stmD.forEach(d -> System.out.print(d + " ")); 


    } 


} 



















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Output:



Output:


3 5 6 8 9 
1.0 2.0 3.0 4.0 5.0 






          
          
          
          

            

    

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