Mapping an Array of Integers to Strings Using Java Streams

Mapping an Array of Integers to Strings Using Java Streams

In this tutorial, we’ll learn how to use Java streams to map an array of integers to an array of strings. We’ll take a look at the map() method and how to use it to transform our source array into a new array of strings.

What is the map() Method in Java?

The map() method is part of the java.util.stream package and is used to perform operations on a given stream of elements. It takes a function as its argument that is applied to each element of the stream. It is an intermediate operation, which means it takes one stream as input and returns a new stream as output.

It can be used to transform a stream of integers into a stream of strings. We will use this method to map an array of integers to an array of strings.

Mapping an Array of Integers to Strings

Let’s say we have an array of integers like this:

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

We can use the map() method to transform this array into an array of strings like this:

String[] strings = Arrays.stream(numbers).map(String::valueOf).toArray(String[]::new);

Here, we are using the map() method to apply the String::valueOf function to each element of the array. This function will map each integer to its corresponding string value. Finally, we use the toArray() method to return the resulting array as a String array.

The resulting array of strings would be: ["1", "2", "3", "4"].

Conclusion

In this tutorial, we learned how to use the map() method in Java to map an array of integers to an array of strings. We saw how to use the map() method with the String::valueOf function, and how to use the toArray() method to get the resulting array as a String array.