How to Convert an Array of Strings to an Array of Integers in Java - Step by Step Examples

How to Convert an Array of Strings to an Array of Integers in Java ?

Answer

To convert an array of strings to an array of integers in Java, you can use the Integer.parseInt method inside a loop to parse each string element.

✐ Examples

1 Convert Array of Strings to Array of Integers using Integer.parseInt

In this example,

We create a string array named stringArray containing string representations of integers.
We declare an integer array named intArray with the same length as stringArray.
We iterate through stringArray using a for loop.
Inside the loop, we use the Integer.parseInt method to convert each string element to an integer and assign it to the corresponding index in intArray.
Finally, we print the contents of intArray to standard output.

Java Program

import java.util.Arrays;

public class Main {
    public static void main(String[] args) {
        String[] stringArray = {"1", "2", "3"};
        int[] intArray = new int[stringArray.length];

        for (int i = 0; i < stringArray.length; i++) {
            intArray[i] = Integer.parseInt(stringArray[i]);
        }

        System.out.println("Integer Array: " + Arrays.toString(intArray));
    }
}

Output

Integer Array: [1, 2, 3]

2 Convert Array of Strings to Array of Integers using Stream API

In this example,

We create a string array named stringArray containing string representations of integers.
We use the Arrays.stream method to stream the elements of stringArray.
We use the mapToInt method along with Integer::parseInt to convert each string element to an integer.
We collect the stream into an integer array using toArray method.
Finally, we print the contents of the integer array to standard output.

Java Program

import java.util.Arrays;

public class Main {
    public static void main(String[] args) {
        String[] stringArray = {"1", "2", "3"};
        int[] intArray = Arrays.stream(stringArray)
                .mapToInt(Integer::parseInt)
                .toArray();

        System.out.println("Integer Array: " + Arrays.toString(intArray));
    }
}

Output

Integer Array: [1, 2, 3]

Summary

In this tutorial, we learned How to Convert an Array of Strings to an Array of Integers in Java language with well detailed examples.

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How to Convert an Array of Strings to an Array of Integers in Java - Step by Step Examples

How to Convert an Array of Strings to an Array of Integers in Java ?

Answer

✐ Examples

1 Convert Array of Strings to Array of Integers using Integer.parseInt

Java Program

Output

2 Convert Array of Strings to Array of Integers using Stream API

Java Program

Output

Summary

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