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Java Array Exercises: Cyclically rotate a given array clockwise by one

Java Array: Exercise-45 with Solution

Write a Java program to cyclically rotate a given array clockwise by one.

Pictorial Presentation:

Java Array Exercises: Cyclically rotate a given array clockwise by one

Sample Solution:

Java Code:

import java.util.Arrays;
 public class Main
{
    static int arra[] = new int[]{10, 20, 30, 40, 50, 60};
     
    static void rotate_array()
    {
       int a = arra[arra.length-1], i;
       for (i = arra.length-1; i > 0; i--)
          arra[i] = arra[i-1];
       arra[0] = a;
    }
     
   public static void main(String[] args) 
    {
        System.out.println("Original arraay:");
        System.out.println(Arrays.toString(arra));
         
        rotate_array();
         
        System.out.println("Rotated arraay:");
        System.out.println(Arrays.toString(arra));
    }
}

Sample Output:

                                                                              
Original arraay:
[10, 20, 30, 40, 50, 60]
Rotated arraay:
[60, 10, 20, 30, 40, 50]

Flowchart:

Flowchart: Cyclically rotate a given array clockwise by one

Visualize Java code execution (Python Tutor):


Java Code Editor:

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Previous: Write a Java program to count the number of possible triangles from a given unsorted array of positive integers.
Next: Write a Java program to check whether there is a pair with a specified sum of a given sorted and rotated array.

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Java: Tips of the Day

Array vs ArrayLists:

The main difference between these two is that an Array is of fixed size so once you have created an Array you cannot change it but the ArrayList is not of fixed size. You can create instances of ArrayLists without specifying its size. So if you create such instances of an ArrayList without specifying its size Java will create an instance of an ArrayList of default size.

Once an ArrayList is full it re-sizes itself. In fact, an ArrayList is internally supported by an array. So when an ArrayList is resized it will slow down its performance a bit as the contents of the old Array must be copied to a new Array.

At the same time, it's compulsory to specify the size of an Array directly or indirectly while creating it. And also Arrays can store both primitives and objects while ArrayLists only can store objects.

Ref: https://bit.ly/3o8L2KH