Advance Java 👨‍💻

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62. Multidimensional Array. class MultiDimArrayExample { public static void main(String[] args) { String[][] names = {{"Mr. ", "Mrs. ", "Ms. "}, {"Smith", "Jones"}}; // Mr. Smith System.out.println(names[0][0] + names[1][0]); // Ms. Jones System.out.println(names[0][2] + names[1][1]); } } @java_codings

61. Missing number in an array. class MissingNumberArray { public static int count = 0; public static int position = 0; public static boolean flag = false; public static void main(String[] args) { int a[] = {0, 1, 2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 18, 20, 21, 23}; findMissingNumbers(a, position); } private static void findMissingNumbers(int a[], int position) { if (position == a.length - 1) return; for (; position < a[a.length - 1]; position++) { if ((a[position] - count) != position) { System.out.println("Missing Number: " + (position + count)); flag = true; count++; break; } } if (flag) { flag = false; findMissingNumbers(a, position); } } } @java_codings

60. Mirror Matrix. import java.util.*; class MirrorMatrix { public static void main(String[] args) { int row, column; Scanner in = new Scanner(System.in); System.out.print("Enter number of rows for matrix :"); row = in.nextInt(); System.out.print("Enter number of rows for matrix :"); column = in.nextInt(); int matrix[][] = new int[row][column]; System.out.println("Enter matrix : "); for (int i = 0; i < row; i++) { for (int j = 0; j < column; j++) { matrix[i][j] = in.nextInt(); } } System.out.println("Mirror matrix : "); for (int i = 0; i < row; i++) { for (int j = column - 1; j >= 0; j--) { System.out.print(matrix[i][j] + "\t"); } System.out.println(""); } } } @java_codings

59. Middle value of an array. import java.util.*; class MiddleValue { public static void main(String args[]) { int[] a; int i, j, n, sum = 0, swap, size; double t; Scanner sc = new Scanner(System.in); System.out.println("Enter size of array"); size = sc.nextInt(); a = new int[size]; System.out.println("Enter numbers "); for (i = 0; i < size; i++) { a[i] = sc.nextInt(); } System.out.println("Numbers are : "); for (i = 0; i < size; i++) { System.out.print(a[i] + " "); } //Sorting for (i = 0; i < (size - 1); i++) { for (j = 0; j < (size - i - 1); j++) { if (a[j] > a[j + 1]) { swap = a[j]; a[j] = a[j + 1]; a[j + 1] = swap; } } } System.out.println("\nNumbers in sorted order : "); for (i = 0; i < size; i++) { System.out.print(a[i] + " "); } //Finding the Middle Value if (size % 2 == 0) { n = (size + 1) / 2; t = (a[n] + a[n - 1]) / 2.0; System.out.println("\nMiddle Value is : " + t); } else { System.out.println("\nMiddle Value is : " + a[size / 2]); } } } @java_codings

58. Merge two array. class MergeArrayDemo { public static void main(String args[]) { Integer a[]={1,2,3,4}; Integer b[]={5,6,7,0}; Integer[] both = concat(a, b); System.out.print("\nFirst Array : "); for(int i=0;i<a.length;i++) { System.out.print(a[i]+"\t"); } System.out.print("\nSecond Array : "); for(int i=0;i<b.length;i++) { System.out.print(b[i]+"\t"); } System.out.print("\nMerged Array : "); for(int i=0;i<both.length;i++) { System.out.print(both[i]+"\t"); } } public static Integer[] concat(Integer[] a, Integer[] b) { int aLen = a.length; int bLen = b.length; Integer[] c= new Integer[aLen+bLen]; System.arraycopy(a, 0, c, 0, aLen); System.arraycopy(b, 0, c, aLen, bLen); return c; } } @java_codings

57. Matrix Subtraction. import java.util.Scanner; class Matrix_Subtraction { Scanner scan; int matrix1[][], matrix2[][], sub[][]; int row, column; void create() { scan = new Scanner(System.in); System.out.println("Matrix Subtraction"); // First Matrix Creation.. System.out.println("\nEnter number of rows & columns"); row = Integer.parseInt(scan.nextLine()); column = Integer.parseInt(scan.nextLine()); matrix1 = new int[row][column]; matrix2 = new int[row][column]; sub = new int[row][column]; System.out.println("Enter the data for first matrix :"); for(int i=0; i &lt row; i++) { for(int j=0; j &lt column; j++) { matrix1[i][j] = scan.nextInt(); } } // Second Matrix Creation.. System.out.println("Enter the data for second matrix :"); for(int i=0; i &lt row; i++) { for(int j=0; j &lt column; j++) { matrix2[i][j] = scan.nextInt(); } } } void display() { System.out.println("\nThe First Matrix is :"); for(int i=0; i &lt row; i++) { for(int j=0; j &lt column; j++) { System.out.print("\t" + matrix1[i][j]); } System.out.println(); } System.out.println("\n\nThe Second Matrix is :"); for(int i=0; i &lt row; i++) { for(int j=0; j &lt column; j++) { System.out.print("\t" + matrix2[i][j]); } System.out.println(); } } void sub() { for(int i=0; i &lt row; i++) { for(int j=0; j &lt column; j++) { sub[i][j] = matrix1[i][j] - matrix2[i][j]; } } System.out.println("\n\nThe Subtraction is :"); for(int i=0; i &lt row; i++) { for(int j=0; j &lt column; j++) { System.out.print("\t" + sub[i][j]); } System.out.println(); } } } class MatrixSubtractionExample { public static void main(String args[]) { Matrix_Subtraction obj = new Matrix_Subtraction(); obj.create(); obj.display(); obj.sub(); } } @java_codings

56. Matrix Operations. import java.util.Scanner; public class Matrices { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("Enter number of rows: "); int rows = scanner.nextInt(); System.out.print("Enter number of columns: "); int columns = scanner.nextInt(); System.out.println(); System.out.println("Enter first matrix"); int[][] a = readMatrix(rows, columns); System.out.println(); System.out.println("Enter second matrix"); int[][] b = readMatrix(rows, columns); int[][] sum = add(a, b); int[][] difference1 = subtract(a, b); int[][] difference2 = subtract(b, a); System.out.println(); System.out.println("A + B ="); printMatrix(sum); System.out.println(); System.out.println("A - B ="); printMatrix(difference1); System.out.println(); System.out.println("B - A ="); printMatrix(difference2); } public static int[][] readMatrix(int rows, int columns) { int[][] result = new int[rows][columns]; Scanner s = new Scanner(System.in); for (int i = 0; i < rows; i++) { for (int j = 0; j < columns; j++) { result[i][j] = s.nextInt(); } } return result; } public static int[][] add(int[][] a, int[][] b) { int rows = a.length; int columns = a[0].length; int[][] result = new int[rows][columns]; for (int i = 0; i < rows; i++) { for (int j = 0; j < columns; j++) { result[i][j] = a[i][j] + b[i][j]; } } return result; } public static int[][] subtract(int[][] a, int[][] b) { int rows = a.length; int columns = a[0].length; int[][] result = new int[rows][columns]; for (int i = 0; i < rows; i++) { for (int j = 0; j < columns; j++) { result[i][j] = a[i][j] - b[i][j]; } } return result; } public static void printMatrix(int[][] matrix) { int rows = matrix.length; int columns = matrix[0].length; for (int i = 0; i < rows; i++) { for (int j = 0; j < columns; j++) { System.out.print(matrix[i][j] + " "); } System.out.println(); } } } @java_codings

55. Matrix Multiplication. import java.util.Scanner; class MatrixMultiplication { public static void main(String args[]) { int m, n, p, q, sum = 0, c, d, k; Scanner in = new Scanner(System.in); System.out.println("Enter the number of rows and columns of first matrix"); m = in.nextInt(); n = in.nextInt(); int first[][] = new int[m][n]; System.out.println("Enter the elements of first matrix"); for (c = 0; c < m; c++) { for (d = 0; d < n; d++) { first[c][d] = in.nextInt(); } } System.out.println("Enter the number of rows and columns of second matrix"); p = in.nextInt(); q = in.nextInt(); if (n != p) System.out.println("Matrices with entered orders can't be multiplied with each other."); else { int second[][] = new int[p][q]; int multiply[][] = new int[m][q]; System.out.println("Enter the elements of second matrix"); for (c = 0; c < p; c++) { for (d = 0; d < q; d++) { second[c][d] = in.nextInt(); } } for (c = 0; c < m; c++) { for (d = 0; d < q; d++) { for (k = 0; k < p; k++) { sum = sum + first[c][k] * second[k][d]; } multiply[c][d] = sum; sum = 0; } } System.out.println("Product of entered matrices:-"); for (c = 0; c < m; c++) { for (d = 0; d < q; d++) { System.out.print(multiply[c][d] + "\t"); } System.out.print("\n"); } } } } @java_codings

54. Matrix Addition. import java.util.Scanner; class MatrixAddition { Scanner scan; int matrix1[][], matrix2[][], sum[][]; int row, column; void create() { scan = new Scanner(System.in); System.out.println("Matrix Addition"); // First Matrix Creation.. System.out.println("\nEnter number of rows & columns"); row = Integer.parseInt(scan.nextLine()); column = Integer.parseInt(scan.nextLine()); matrix1 = new int[row][column]; matrix2 = new int[row][column]; sum = new int[row][column]; System.out.println("Enter the data for first matrix :"); for(int i=0; i &lt row; i++) { for(int j=0; j &lt column; j++) { matrix1[i][j] = scan.nextInt(); } } // Second Matrix Creation.. System.out.println("Enter the data for second matrix :"); for(int i=0; i &lt row; i++) { for(int j=0; j &lt column; j++) { matrix2[i][j] = scan.nextInt(); } } } void display() { System.out.println("\nThe First Matrix is :"); for(int i=0; i &lt row; i++) { for(int j=0; j &lt column; j++) { System.out.print("\t" + matrix1[i][j]); } System.out.println(); } System.out.println("\n\nThe Second Matrix is :"); for(int i=0; i &lt row; i++) { for(int j=0; j &lt column; j++) { System.out.print("\t" + matrix2[i][j]); } System.out.println(); } } void add() { for(int i=0; i &lt row; i++) { for(int j=0; j &lt column; j++) { sum[i][j] = matrix1[i][j] + matrix2[i][j]; } } System.out.println("\n\nThe Sum is :"); for(int i=0; i &lt row; i++) { for(int j=0; j &lt column; j++) { System.out.print("\t" + sum[i][j]); } System.out.println(); } } } class MatrixAdditionExample { public static void main(String args[]) { MatrixAddition obj = new MatrixAddition(); obj.create(); obj.display(); obj.add(); } } @java_codings