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Added MirrorOfMatrix.java (TheAlgorithms#4461)
* Added MirrorOfMatrix.java * Fixing Linting Issue * Fixing Linting Issue * Fixing Linting Issue * Fixing Linting Issue * Fixing Linting Issue * Fixing Linting Issue * Fixing Linting Issue * Fixing Linting Issue * Changes Done * Update src/main/java/com/thealgorithms/misc/MirrorOfMatrix.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * Changes Done * Added MirrorOfMatrixTest.java * Added MirrorOfMatrixTest.java * Linting Error in Test * Linting Error in Test * Linting Error in Test * trying to fix build error * trying to fix build error * final * Update src/main/java/com/thealgorithms/misc/MirrorOfMatrix.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * Update src/main/java/com/thealgorithms/misc/MirrorOfMatrix.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * Update src/main/java/com/thealgorithms/misc/MirrorOfMatrix.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * Update src/test/java/com/thealgorithms/misc/MirrorOfMatrixTest.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * Update src/test/java/com/thealgorithms/misc/MirrorOfMatrixTest.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * Update src/test/java/com/thealgorithms/misc/MirrorOfMatrixTest.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * Changing Description * Final * Update src/main/java/com/thealgorithms/misc/MirrorOfMatrix.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * Final * Update src/main/java/com/thealgorithms/misc/MirrorOfMatrix.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * Changes * Changes * Linting Issue * Linting Issue * Linting Issue * Changes * Fixing Minor Linting Issue * Fixing Minor Linting Issue * Final * Update src/main/java/com/thealgorithms/misc/MirrorOfMatrix.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * Changes * Linting Issue * Linting Issue * Linting Issue * Linting Issue * Update src/main/java/com/thealgorithms/misc/MirrorOfMatrix.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * Update src/main/java/com/thealgorithms/misc/MirrorOfMatrix.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * Update src/main/java/com/thealgorithms/misc/MirrorOfMatrix.java Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> * Changes * Changes * fix: use proper size in `checkInput` * style: basic linting --------- Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com> Co-authored-by: vil02 <vil02@o2.pl>
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‎src/main/java/com/thealgorithms/misc/MirrorOfMatrix.java

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package com.thealgorithms.misc;
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// Problem Statement
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/*
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We have given an array of m x n (where m is the number of rows and n is the number of columns).
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Print the new matrix in such a way that the new matrix is the mirror image of the original matrix.
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The Original matrix is: | The Mirror matrix is:
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1 2 3 | 3 2 1
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4 5 6 | 6 5 4
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7 8 9 | 9 8 7
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@author - Aman (https://github.com/Aman28801)
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*/
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public final class MirrorOfMatrix {
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private MirrorOfMatrix() {
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}
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public static int[][] mirrorMatrix(final int[][] originalMatrix) {
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if (originalMatrix == null) {
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// Handle invalid input
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return null;
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}
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if (originalMatrix.length == 0) {
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return new int[0][0];
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}
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checkInput(originalMatrix);
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int numRows = originalMatrix.length;
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int numCols = originalMatrix[0].length;
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int[][] mirroredMatrix = new int[numRows][numCols];
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for (int i = 0; i < numRows; i++) {
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mirroredMatrix[i] = reverseRow(originalMatrix[i]);
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}
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return mirroredMatrix;
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}
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private static int[] reverseRow(final int[] inRow) {
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int[] res = new int[inRow.length];
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for (int i = 0; i < inRow.length; ++i) {
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res[i] = inRow[inRow.length - 1 - i];
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}
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return res;
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}
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private static void checkInput(final int[][] matrix) {
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// Check if all rows have the same number of columns
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for (int i = 1; i < matrix.length; i++) {
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if (matrix[i].length != matrix[0].length) {
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throw new IllegalArgumentException("The input is not a matrix.");
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}
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}
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}
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}

‎src/test/java/com/thealgorithms/misc/MirrorOfMatrixTest.java

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package com.thealgorithms.misc;
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import static org.junit.jupiter.api.Assertions.assertArrayEquals;
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import static org.junit.jupiter.api.Assertions.assertNull;
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import static org.junit.jupiter.api.Assertions.assertThrows;
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import org.junit.jupiter.api.Test;
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class MirrorOfMatrixTest {
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@Test
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void testMirrorMatrixRegularMatrix() {
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int[][] originalMatrix = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
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int[][] expectedMirrorMatrix = {{3, 2, 1}, {6, 5, 4}, {9, 8, 7}};
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int[][] mirroredMatrix = MirrorOfMatrix.mirrorMatrix(originalMatrix);
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assertArrayEquals(expectedMirrorMatrix, mirroredMatrix);
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}
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@Test
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void testMirrorMatrixEmptyMatrix() {
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int[][] originalMatrix = {};
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int[][] expectedMirrorMatrix = {};
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int[][] mirroredMatrix = MirrorOfMatrix.mirrorMatrix(originalMatrix);
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assertArrayEquals(expectedMirrorMatrix, mirroredMatrix);
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}
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@Test
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void testMirrorMatrixSingleElementMatrix() {
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int[][] originalMatrix = {{42}};
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int[][] expectedMirrorMatrix = {{42}};
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int[][] mirroredMatrix = MirrorOfMatrix.mirrorMatrix(originalMatrix);
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assertArrayEquals(expectedMirrorMatrix, mirroredMatrix);
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}
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@Test
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void testMirrorMatrixMultipleRowsOneColumnMatrix() {
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int[][] originalMatrix = {{1}, {2}, {3}, {4}};
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int[][] expectedMirrorMatrix = {{1}, {2}, {3}, {4}};
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int[][] mirroredMatrix = MirrorOfMatrix.mirrorMatrix(originalMatrix);
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assertArrayEquals(expectedMirrorMatrix, mirroredMatrix);
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}
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@Test
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void testMirrorMatrixNullInput() {
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int[][] originalMatrix = null;
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assertNull(MirrorOfMatrix.mirrorMatrix(originalMatrix));
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}
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@Test
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void testMirrotMarixThrows() {
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assertThrows(IllegalArgumentException.class, () -> MirrorOfMatrix.mirrorMatrix(new int[][] {{1}, {2, 3}}));
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}
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}

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