Java: Reverse an array of integer values

Last update on May 09 2025 12:48:39 (UTC/GMT +8 hours)

11. Reverse an integer array

Write a Java program to reverse an array of integer values.

Pictorial Presentation:

Sample Solution:

Java Code:

// Import the Arrays class from the java.util package.
import java.util.Arrays;

// Define a class named Exercise11.
public class Exercise11 {
    
    // The main method where the program execution starts.
    public static void main(String[] args) {
        // Declare and initialize an integer array 'my_array1'.
        int[] my_array1 = {
            1789, 2035, 1899, 1456, 2013, 
            1458, 2458, 1254, 1472, 2365, 
            1456, 2165, 1457, 2456
        };
        
        // Print the original array using Arrays.toString() method.
        System.out.println("Original array : " + Arrays.toString(my_array1));  
        
        // Iterate through the first half of the array and reverse its elements.
        for (int i = 0; i < my_array1.length / 2; i++) {
            // Swap the elements at positions 'i' and 'length - i - 1'.
            int temp = my_array1[i];
            my_array1[i] = my_array1[my_array1.length - i - 1];
            my_array1[my_array1.length - i - 1] = temp;
        }
        
        // Print the reversed array using Arrays.toString() method.
        System.out.println("Reverse array : " + Arrays.toString(my_array1));
    }
}

Sample Output:

Original array : [1789, 2035, 1899, 1456, 2013, 1458, 2458, 1254, 1472, 2365, 1456, 2165, 1457, 2456]         
Reverse array : [2456, 1457, 2165, 1456, 2365, 1472, 1254, 2458, 1458, 2013, 1456, 1899, 2035, 1789]

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to reverse only the even numbers in an array.
• Write a Java program to reverse an array in-place without using an extra array.
• Write a Java program to reverse a section of an array between two given indices.
• Write a Java program to reverse an array using recursion.

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