How to Reverse an Array in Java - Step by Step Examples

How to Reverse an Array in Java ?

Answer

To reverse an array in Java, you can use a simple loop to swap elements from the start and end of the array until you reach the middle.

✐ Examples

1 Reverse Integer Array

In this example,

We create an integer array named arr with some values.
We initialize two variables, start at 0 and end at arr.length - 1.
We use a while loop with the condition start < end to swap elements at positions start and end.
Increment start and decrement end in each iteration.
After the loop, the arr array will be reversed.

Java Program

public class Main {
    public static void main(String[] args) {
        int[] arr = {1, 2, 3, 4, 5};
        int start = 0;
        int end = arr.length - 1;

        while (start < end) {
            int temp = arr[start];
            arr[start] = arr[end];
            arr[end] = temp;
            start++;
            end--;
        }

        // Print the reversed array
        for (int num : arr) {
            System.out.print(num + " ");
        }
    }
}

Output

5 4 3 2 1

2 Reverse String Array

In this example,

We create a string array named strArr with some values.
We initialize two variables, start at 0 and end at strArr.length - 1.
We use a while loop with the condition start < end to swap elements at positions start and end.
Increment start and decrement end in each iteration.
After the loop, the strArr array will be reversed.

Java Program

public class Main {
    public static void main(String[] args) {
        String[] strArr = {"apple", "banana", "cherry"};
        int start = 0;
        int end = strArr.length - 1;

        while (start < end) {
            String temp = strArr[start];
            strArr[start] = strArr[end];
            strArr[end] = temp;
            start++;
            end--;
        }

        // Print the reversed array
        for (String str : strArr) {
            System.out.print(str + " ");
        }
    }
}

Output

cherry banana apple

Summary

In this tutorial, we learned How to Reverse an Array in Java language with well detailed examples.

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How to Reverse an Array in Java - Step by Step Examples

How to Reverse an Array in Java ?

Answer

✐ Examples

1 Reverse Integer Array

Java Program

Output

2 Reverse String Array

Java Program

Output

Summary

More Java Arrays Tutorials