How to Create a Mirror Image of A 2D Array in Java?

It is a very interesting problem frequently asked in interviews of top IT companies like Google, Amazon, TCS, Accenture, IBM etc. By solving the problem, one wants to check the logical ability, critical thinking, and problem-solving skill of the interviewee. So, in this section, we are going to discuss how to create a mirror image of a 2D array in Java with different approaches and logic. Also, we will create Java programs for the same.

Problem Statement

We have given an array of m x n (where m is the number of rows and n is the number of columns). Print the new matrix in such a way that the new matrix is the mirror image of the original matrix.

Mirror Image

In a mirror image of a 2D array of m*n, elements of the first and the last columns are interchanged. The middle column remains fixed, as shown in the following figure. Note that only columns of a mirror image are interchanged row remains unaffected.

If the matrix is of 4*4, the second and fourth columns will also be interchanged.

Note: If in the given matrix the number of columns is odd the middle column will be fixed and the rest of the columns will be interchanged.

How to Create a Mirror Image of A 2D Array in Java

Solution to the Problem

MirrorImage.java

import java.util.Scanner;
public class MirrorImage
{
public static void main(String args[]) 
{
//creating an instance of the scanner class 
Scanner in = new Scanner(System.in);
System.out.print("Enter number of rows (m): ");
//reads number of rows
int m = in.nextInt();
System.out.print("Enter number of columns (n): ");
//reads number of columns
int n = in.nextInt();
//creating an array of m*n type
int arr[][] = new int[m][n];
//another array to store mirror image 
int newArr[][] = new int[m][n];
System.out.println("Enter array elements");
//read array elements for row nth row
for (int i = 0; i < m; i++) 
{
System.out.println("Enter Row "+ (i+1) + ":");
for (int j = 0; j < n; j++) 
{
arr[i][j] = in.nextInt();
}
}
//prints the input array 
System.out.println("Input Array:");
for (int i = 0; i < m; i++) 
{
for (int j = 0; j < n; j++) 
{
System.out.print(arr[i][j] + "\t");
}
System.out.println();
}
//interchanging (swapping) matrix elements
for (int j = 0; j < n; j++) 
{
for (int i = 0; i < m; i++) 
{
newArr[i][n - 1 - j] = arr[i][j]; 
}
}
//prints mirror image of the given matrix
System.out.println("Mirror Image of Array:");
for (int i = 0; i < m; i++) 
{
for (int j = 0; j < n; j++) 
{
System.out.print(newArr[i][j] + "\t");
}
System.out.println();
}
}
}

Output:

Next TopicAdd Numbers Represented by Linked Lists in Java

← prev next →

For Videos Join Our Youtube Channel: Join Now

Feedback

Send your Feedback to [email protected]

Help Others, Please Share

Learn Latest Tutorials

Splunk

SPSS

Swagger

Transact-SQL

Tumblr

ReactJS

Regex

Reinforcement Learning

R Programming

RxJS

React Native

Python Design Patterns

Python Pillow

Python Turtle

Keras

Preparation

Aptitude

Reasoning

Verbal Ability

Interview Questions

Company Questions

Trending Technologies

Artificial Intelligence

AWS

Selenium

Cloud Computing

Hadoop

ReactJS

Data Science

Angular 7

Blockchain

Git

Machine Learning

DevOps

B.Tech / MCA

DBMS

Data Structures

DAA

Operating System

Computer Network

Compiler Design

Computer Organization

Discrete Mathematics

Ethical Hacking

Computer Graphics

Software Engineering

Web Technology

Cyber Security

Automata

C Programming

C++

Java

.Net

Python

Programs

Control System

Data Mining

Data Warehouse

Javatpoint Services

JavaTpoint offers too many high quality services. Mail us on [email protected], to get more information about given services.

Website Designing
Website Development
Java Development
PHP Development
WordPress
Graphic Designing
Logo
Digital Marketing
On Page and Off Page SEO
PPC
Content Development
Corporate Training
Classroom and Online Training
Data Entry

Training For College Campus

JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. Please mail your requirement at [email protected]
Duration: 1 week to 2 week

^{Like/Subscribe us for latest updates or newsletter}