Java 8 - How to Convert an Array to a Stream

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In this tutorial, we will see “How to convert an Array to a Stream in Java 8?”

To achieve that, we are going to use Arrays.stream OR Stream.of operations available since Java 8.

Convert an Array to a Stream in Java 8 with example...!!! Share on X

Table of Contents

Example 1. Convert Array of String to Stream using Arrays.stream
Example 2. Convert Array of String to Stream using Stream.of
Example 3. Convert Array of Integer to Stream using Arrays.stream
Example 4. Convert Array of Integer to Stream using Stream.of (It won’t work – check the solution)
Example 5. Convert Array of Integer to Stream using Arrays.stream
Example 6. Convert Array of Integer to Stream using Stream.of (It won’t work – check the solution)

Example 1. Convert Array of String to Stream using Arrays.stream

import java.util.Arrays;
import java.util.stream.Stream;
public class Convert_Array_To_Stream_Java8_Example1 {
    public static void main(String[] args) {
        String[] arrayObj = {
            "Tom",
            "Henry",
            "Dan",
            "Zack",
            "John"
        };
        //Arrays.stream
        Stream &lt;String&gt; streamObj1 = Arrays.stream(arrayObj);
        System.out.println("Stream of strings using Arrays.stream:");
        streamObj1.forEach(s -&gt; System.out.println(s));
    }
}

import java.util.Arrays;

import java.util.stream.Stream;

public class Convert_Array_To_Stream_Java8_Example1 {

public static void main(String[] args) {

String[] arrayObj = {

"Tom",

"Henry",

"Dan",

"Zack",

"John"

};

//Arrays.stream

Stream <String> streamObj1 = Arrays.stream(arrayObj);

System.out.println("Stream of strings using Arrays.stream:");

streamObj1.forEach(s -> System.out.println(s));

}

Output:

Stream of strings using Arrays.stream:
Tom
Henry
Dan
Zack
John

Stream of strings using Arrays.stream:

Tom

Henry

Dan

Zack

John

Example 2. Convert Array of String to Stream using Stream.of

import java.util.stream.Stream;
public class Convert_Array_To_Stream_Java8_Example2 {
    public static void main(String[] args) {
        String[] arrayObj = {
            "Tom",
            "Henry",
            "Dan",
            "Zack",
            "John"
        };
        //Stream.of
        Stream &lt;String&gt; streamObj2 = Stream.of(arrayObj);
        System.out.println("Stream of strings using Stream.of:");
        streamObj2.forEach(s -&gt; System.out.println(s));
    }
}

import java.util.stream.Stream;

public class Convert_Array_To_Stream_Java8_Example2 {

public static void main(String[] args) {

String[] arrayObj = {

"Tom",

"Henry",

"Dan",

"Zack",

"John"

};

//Stream.of

Stream <String> streamObj2 = Stream.of(arrayObj);

System.out.println("Stream of strings using Stream.of:");

streamObj2.forEach(s -> System.out.println(s));

}

Output:

Stream of strings using Stream.of:
Tom
Henry
Dan
Zack
John

Stream of strings using Stream.of:

Tom

Henry

Dan

Zack

John

Example 3. Convert Array of Integer to Stream using Arrays.stream

import java.util.Arrays;
import java.util.stream.IntStream;
public class Convert_Array_To_Stream_Java8_Example3 {
    public static void main(String[] args) {
        int[] arrayObj = {
            10,
            62,
            93,
            84,
            75
        };
        //Arrays.stream
        IntStream intStreamObj1 = Arrays.stream(arrayObj);
        System.out.println("IntStream of integers using Arrays.stream:");
        intStreamObj1.forEach(x -&gt; System.out.println(x));
    }
}

import java.util.Arrays;

import java.util.stream.IntStream;

public class Convert_Array_To_Stream_Java8_Example3 {

public static void main(String[] args) {

int[] arrayObj = {

10,

62,

93,

84,

};

//Arrays.stream

IntStream intStreamObj1 = Arrays.stream(arrayObj);

System.out.println("IntStream of integers using Arrays.stream:");

intStreamObj1.forEach(x -> System.out.println(x));

}

Output:

IntStream of integers using Arrays.stream:
10
62
93
84
75

IntStream of integers using Arrays.stream:

Example 4. Convert Array of Integer to Stream using Stream.of (It won’t work – check the solution)

import java.util.Arrays;
import java.util.stream.IntStream;
import java.util.stream.Stream;
public class Convert_Array_To_Stream_Java8_Example4 {
    public static void main(String[] args) {
        int[] arrayObj = {
            10,
            62,
            93,
            84,
            75
        };
        //Stream.of (It won't work for integers)
        Stream &lt;int[]&gt; streamObj1 = Stream.of(arrayObj);
        System.out.println("Stream of integers using Stream.of:");
        //It won't work as you can't print Stream&lt;int[]&gt; directly
        streamObj1.forEach(s -&gt; System.out.println(s));

        //To make it working, convert the Stream&lt;int[]&gt; into IntStream first using flatMapToInt
        Stream &lt;int[]&gt; streamObj2 = Stream.of(arrayObj);
        IntStream intStreamObj2 = streamObj2.flatMapToInt(i -&gt; Arrays.stream(i));
        System.out.println("\nIntStream of integers using Stream.of:");
        intStreamObj2.forEach(s -&gt; System.out.println(s));
    }
}

import java.util.Arrays;

import java.util.stream.IntStream;

import java.util.stream.Stream;

public class Convert_Array_To_Stream_Java8_Example4 {

public static void main(String[] args) {

int[] arrayObj = {

10,

62,

93,

84,

};

//Stream.of (It won't work for integers)

Stream <int[]> streamObj1 = Stream.of(arrayObj);

System.out.println("Stream of integers using Stream.of:");

//It won't work as you can't print Stream<int[]> directly

streamObj1.forEach(s -> System.out.println(s));

//To make it working, convert the Stream<int[]> into IntStream first using flatMapToInt

Stream <int[]> streamObj2 = Stream.of(arrayObj);

IntStream intStreamObj2 = streamObj2.flatMapToInt(i -> Arrays.stream(i));

System.out.println("\nIntStream of integers using Stream.of:");

intStreamObj2.forEach(s -> System.out.println(s));

}

Output:

Stream of integers using Stream.of:
[I@816f27d
IntStream of integers using Stream.of:
10
62
93
84
75

Stream of integers using Stream.of:

[I@816f27d

IntStream of integers using Stream.of:

Example 5. Convert Array of Integer to Stream using Arrays.stream

import java.util.Arrays;
import java.util.stream.Stream;
public class Convert_Array_To_Stream_Java8_Example5 {
    public static void main(String[] args) {
        String[] arrayObj = {
            "Tom",
            "Henry",
            "Dan",
            "Zack",
            "John"
        };
        //Arrays.stream
        Stream &lt;String&gt; streamObj1 = Arrays.stream(arrayObj, 2, 5);
        System.out.println("Stream of strings within range 2 and 5 using Arrays.stream:");
        streamObj1.forEach(s -&gt; System.out.println(s));
    }
}

import java.util.Arrays;

import java.util.stream.Stream;

public class Convert_Array_To_Stream_Java8_Example5 {

public static void main(String[] args) {

String[] arrayObj = {

"Tom",

"Henry",

"Dan",

"Zack",

"John"

};

//Arrays.stream

Stream <String> streamObj1 = Arrays.stream(arrayObj, 2, 5);

System.out.println("Stream of strings within range 2 and 5 using Arrays.stream:");

streamObj1.forEach(s -> System.out.println(s));

}

Output:

Stream of strings within range 2 and 5 using Arrays.stream:
Dan
Zack
John

Stream of strings within range 2 and 5 using Arrays.stream:

Dan

Zack

John

Example 6. Convert Array of Integer to Stream using Stream.of (It won’t work – check the solution)

import java.util.Arrays;
import java.util.stream.IntStream;
import java.util.stream.Stream;
public class Convert_Array_To_Stream_Java8_Example6 {
    public static void main(String[] args) {
        int[] arrayObj = {
            10,
            62,
            93,
            84,
            75
        };
        //Arrays.stream
        IntStream streamObj1 = Arrays.stream(arrayObj, 2, 5);
        System.out.println("Stream of integers within range 2 and 5 using Arrays.stream:");
        streamObj1.forEach(s - &gt; System.out.println(s));
    }
}

import java.util.Arrays;

import java.util.stream.IntStream;

import java.util.stream.Stream;

public class Convert_Array_To_Stream_Java8_Example6 {

public static void main(String[] args) {

int[] arrayObj = {

10,

62,

93,

84,

};

//Arrays.stream

IntStream streamObj1 = Arrays.stream(arrayObj, 2, 5);

System.out.println("Stream of integers within range 2 and 5 using Arrays.stream:");

streamObj1.forEach(s - > System.out.println(s));

}

Output:

Stream of integers within range 2 and 5 using Arrays.stream:
93
84
75

Stream of integers within range 2 and 5 using Arrays.stream:

Convert an Array to a Stream in Java 8 with example...!!! Share on X

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Other Useful References:

java.util.stream by Oracle

Author

Deepak Verma
Deepak Verma is a Test Automation Consultant and Software development Engineer for more than 10 years. His mission is to help you become an In-demand full stack automation tester. He is also the founder of Techndeck, a blog and online coaching platform dedicated to helping you succeed with all the automation basics to advanced testing automation tricks.
View all posts
http://Techndeck.com deepak.rkgit@gmail.com Verma Deepak

Java 8 – How to Convert an Array to a Stream

Example 1. Convert Array of String to Stream using Arrays.stream

Example 2. Convert Array of String to Stream using Stream.of

Example 3. Convert Array of Integer to Stream using Arrays.stream

Example 4. Convert Array of Integer to Stream using Stream.of (It won’t work – check the solution)

Example 5. Convert Array of Integer to Stream using Arrays.stream

Example 6. Convert Array of Integer to Stream using Stream.of (It won’t work – check the solution)

Author

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Java 8 – How to Convert an Array to a Stream

Example 1. Convert Array of String to Stream using Arrays.stream

Example 2. Convert Array of String to Stream using Stream.of

Example 3. Convert Array of Integer to Stream using Arrays.stream

Example 4. Convert Array of Integer to Stream using Stream.of (It won’t work – check the solution)

Example 5. Convert Array of Integer to Stream using Arrays.stream

Example 6. Convert Array of Integer to Stream using Stream.of (It won’t work – check the solution)

Author

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