Convert IntStream to String in Java and vice versa

Since Java doesn’t offer any character stream, we can create an IntStream (a stream of ints) of characters when dealing with strings. This post will discuss how to convert string to IntStream and IntStream to string in Java.

1. Convert `String` to `IntStream`

The simplest solution to get an IntStream from a string is to call the codePoints() or chars() method on the string, as shown below:

import java.util.stream.IntStream;

class Main

{

public static void main(String[] args)

{

String input = "Techie Delight";

// Convert `String` to `IntStream`

IntStream intStream = input.codePoints();

intStream.forEach(System.out::println);

}

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Output:

84
101
99
104
105
101
32
68
101
108
105
103
104
116

2. Convert `IntStream` to `String`

Converting IntStream to string is not so straightforward in Java. The idea is to use a collector, which accumulates the values using a StringBuilder.

import java.util.stream.IntStream;

class Main

{

public static void main(String[] args)

{

String input = "Techie Delight";

// Convert `IntStream` to `String`

String string = input.codePoints() // IntStream

.collect(StringBuilder::new, // supplier

StringBuilder::appendCodePoint, // accumulator

StringBuilder::append) // combiner

.toString();

System.out.println(string);

}

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Output:

Techie Delight

3. Convert `Character` array to `IntStream`

If we have a character array, we can convert it into a stream of Characters and then use flatMapToInt to convert the stream into an IntStream.

import java.util.stream.IntStream;

import java.util.stream.Stream;

class Main

{

public static void main(String[] args)

{

Character[] chars = { 'T', 'e', 'c', 'h', 'i', 'e' };

// Convert `Character[]` to `IntStream`

IntStream intStream = Stream.of(chars)

.flatMapToInt(IntStream::of);

intStream.forEach(System.out::println);

}

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Output:

84
101
99
104
105
101

That’s all about converting IntStream to Java String and vice versa.

Convert IntStream to String in Java and vice versa

1. Convert String to IntStream

2. Convert IntStream to String

3. Convert Character array to IntStream

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1. Convert `String` to `IntStream`

2. Convert `IntStream` to `String`

3. Convert `Character` array to `IntStream`