Java: Swap the first and last elements of an array and create a new array

Last update on April 01 2025 10:50:59 (UTC/GMT +8 hours)

Swap First and Last Elements

Write a Java program to swap the first and last elements of an array (length must be at least 1) and create another array.

Sample Solution:

Java Code:

import java.util.Arrays;

public class Exercise81 {
    public static void main(String[] args) {
        // Define an integer array, array_nums
        int[] array_nums = {20, 30, 40};
        
        // Print the elements of the original array
        System.out.println("Original Array: " + Arrays.toString(array_nums)); 
        
        // Store the value of the first element in the variable x
        int x = array_nums[0];
        
        // Swap the first and last elements of the array
        array_nums[0] = array_nums[array_nums.length - 1];
        array_nums[array_nums.length - 1] = x;
        
        // Print the new array after swapping the first and last elements
        System.out.println("New array after swapping the first and last elements: " + Arrays.toString(array_nums));  
    }
}

Sample Output:

Original Array: [20, 30, 40]                                           
New array after swaping the first and last elements: [40, 30, 20]

Flowchart:

For more Practice: Solve these Related Problems:

• Modify the program to swap the second and second-last elements instead.
• Write a program to reverse all elements in an array.
• Modify the program to swap the first and last elements only if the array length is greater than 3.
• Write a program to swap two specified elements in an array.

Java Code Editor:

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