[Edit]

Java 8 - convert char[] to Stream<Character>

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Created by:

Flimzy

596

Short solution:

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char[] charArr = {'a', 'b', 'c'};
​
// Example 1 - the best way:
Stream<Character> charStream = new String(charArr)
        .chars().mapToObj(c -> (char) c);

Short solution - another 2 approaches:

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char[] charArr = {'a', 'b', 'c'};
​
// Example 2
Stream<Character> charStream2 = IntStream.range(0, charArr.length)
        .mapToObj(idx -> charArr[idx]);
        
// Example 3
Stream<Character> charStream3 = CharBuffer.wrap(charArr)
        .chars().mapToObj(i -> (char) i);

In this post we can find 3 different ways of how to create stream of Characters from primitive char[] array in java.

Code snipped with the best way of how to do it:

Below we have full code snipped with those solutions.

1. String.chars()

Edit

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import java.util.stream.Collectors;
import java.util.stream.Stream;
​
public class Example1 {
​
    public static void main(String[] args) {
​
        char[] charArr = {'a', 'b', 'c'};
​
        Stream<Character> charStream = new String(charArr)
                .chars().mapToObj(c -> (char) c);
​
        String string = charStream.map(String::valueOf)
                .collect(Collectors.joining());
​
        System.out.println(string); // abc
    }
}

Output:

xxxxxxxxxx
 
abc

2. IntStream.range()

Edit

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import java.util.stream.Collectors;
import java.util.stream.IntStream;
import java.util.stream.Stream;
​
public class Example2 {
​
    public static void main(String[] args) {
​
        char[] charArr = {'a', 'b', 'c'};
​
        Stream<Character> charStream = IntStream.range(0, charArr.length)
                .mapToObj(idx -> charArr[idx]);
​
        String string = charStream.map(String::valueOf)
                .collect(Collectors.joining());
​
        System.out.println(string); // abc
    }
}

Output:

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abc

3. CharBuffer.wrap().chars()

Edit

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import java.nio.CharBuffer;
import java.util.stream.Collectors;
import java.util.stream.Stream;
​
public class Example3 {
​
    public static void main(String[] args) {
​
        char[] charArr = {'a', 'b', 'c'};
​
        Stream<Character> charStream = CharBuffer.wrap(charArr)
                .chars().mapToObj(i -> (char) i);
​
        String string = charStream.map(String::valueOf)
                .collect(Collectors.joining());
​
        System.out.println(string); // abc
    }
}