Convert int array to string array in Java

This post will discuss how to convert primitive integer array to string array in Java.

1. Naive solution

A naive solution is to create an array of string type and use a regular for-loop to assign values to it from a primitive integer array after converting int to strings.

import java.util.Arrays;

class Main

{

// Program to convert primitive integer array to string array in Java

public static void main(String[] args)

{

// input primitive integer array

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

String[] strArray = new String[intArray.length];

for (int i = 0; i < intArray.length; i++) {

strArray[i] = String.valueOf(intArray[i]);

}

System.out.println(Arrays.toString(strArray));

}

Download Run Code

Output:

[1, 2, 3, 4, 5]

2. Using Java 8

Another solution is to use Java 8 Stream to convert a primitive integer array to string array:

Convert the specified primitive array to a IntStream using Arrays.stream() or IntStream.of() method.
Convert each element of the stream to a string using IntStream.mapToObj() method.
Return a string array containing elements of this stream using Stream.toArray().

The following program demonstrates it:

import java.util.Arrays;

class Main

{

// Program to convert primitive integer array to string array in Java 8 and above

public static void main(String[] args)

{

// input primitive integer array

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

String[] strArray = Arrays.stream(intArray)

.mapToObj(String::valueOf)

.toArray(String[]::new);

System.out.println(Arrays.toString(strArray));

}

Download Run Code

Output:

[1, 2, 3, 4, 5]

3. Using Regex

This approach is not recommended.

import java.util.Arrays;

class Main

{

// Program to convert primitive integer array to string array in Java

public static void main(String[] args)

{

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

String str = Arrays.toString(intArray) // [1, 2, 3, 4, 5]

.replaceAll("\\s+", ""); // [1,2,3,4,5]

String[] strArray = str.substring(1, str.length() - 1) // 1,2,3,4,5

.split(",");

System.out.println(Arrays.toString(strArray));

}

Download Run Code

Output:

[1, 2, 3, 4, 5]

That’s all about converting int array to string array in Java.

Convert int array to string array in Java

1. Naive solution

2. Using Java 8

3. Using Regex

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