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In this tutorial, we will write a program to calculate the Transpose of a matrix in Java. As this program is based on Array and uses of for loop so you may go through the following first.

• Array in Java
• for loop in java

Transpose of a matrix refers to converting the rows of a matrix into columns and columns of a matrix into rows. Consider a matrix A of 2 * 3 dimension, after transpose of A, the A matrix becomes 3 * 2 dimension.

The Program takes the input for both the column and row elements from the user using the scanner class and transposes for that matrix is calculated. And lastly displays the final result with altered rows and columns.

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Java Program to Find the Transpose of a Matrix

  //transpose of a matrix in java
  
 import java.util.Scanner;

 public class TransposeOfMatrix
 {
    public static void main(String args[])
    {
        int row, col, i, j;
    
        Scanner in = new Scanner(System.in);
        System.out.println("Enter the rows and columns of the matrix");
        row = in.nextInt();
        col = in.nextInt();
    
        int matrix[][] = new int[row][col];
        
        System.out.println("Enter the elements of matrix");
    
        for (i = 0; i < row; i++)
        {
         for (j = 0; j < col; j++)
         {
          matrix[i][j] = in.nextInt();
         }
        }
        int transpose[][] = new int[col][row];
        
        for (i = 0; i < row; i++)
        {
         for (j = 0; j < col; j++)  
         {            
            transpose[j][i] = matrix[i][j];
         }
        }
            
    
        System.out.println("Transpose of a entered matrix are:");
    
        for (i = 0; i < col; i++)
        {
         for (j = 0; j < row; j++)
         {
           System.out.print(transpose[i][j]+"\t");
         }
        System.out.print("\n");
        }
    }
 }

Output:

 Enter the rows and columns of the matrix
 2
 3
 Enter the elements of matrix
 1
 2
 3
 4
 5
 6
 Transpose of a entered matrix are:
 1	 4	
 2	 5	
 3	 6

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In this tutorial, we will write a java program to calculate the multiplication of two matrices. As this program is based on Array and uses of for loop so you may go through the following first.

• Array in Java
• for loop in java

Matrices mean having two-dimension that is there are columns and rows in the following java example.

The Program takes the input for both the column and row elements from the user using the scanner class and a third two-dimensional array is created to store the multiplication result of two matrices. And lastly displays the final result.

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Java Program to Multiply Two Matrices

 //multiplication of a matrix
  
 import java.util.Scanner;

 public class MultilicationMatrix
 {
    public static void main(String args[])
    {
    int r1, r2,c1,c2,i,j,k,sum;
    Scanner in = new Scanner(System.in);
    
    //first matrix
    System.out.println("Enter the number of rows of matrix1");
    r1 = in.nextInt();
    System.out.println("Enter the number columns of matrix 1");
    c1 = in.nextInt();
    
    //second matrix
    System.out.println("Enter the number of rows of matrix2");
    r2 = in.nextInt();
    System.out.println("Enter the number of columns of matrix 2");
    c2 = in.nextInt();
    
    //condition for multiplication
   if(c1==r2)
   {
    
    int mat1[][] = new int[r1][c1]; 
    int mat2[][] = new int[r2][c2]; 
    int result[][] = new int[r1][c2];
    
    System.out.println("Enter the elements of matrix1");
    for ( i= 0 ; i < r1 ; i++ )
    { 
     for ( j= 0 ; j < c1 ;j++ )
     {
      mat1[i][j] = in.nextInt();
     }
    }
    
    System.out.println("Enter the elements of matrix2");
    for ( i= 0 ; i < r2 ; i++ )
    { 
     for ( j= 0 ; j < c2 ;j++ )
     {
      mat2[i][j] = in.nextInt();
     }
    }
    
    System.out.println("Result of multiplication:-");
    for ( i= 0 ; i < r1 ; i++ )
    {
    
     for ( j = 0 ; j < c2; j++)
     {
        sum = 0;
        for ( k = 0 ; k < r2; k++ )
        {
         sum += mat1[i][k] * mat2[k][j] ;
        }
        result[i][j] = sum;
     }
    } 
    for ( i= 0 ; i < r1; i++ )
    {
     for ( j=0 ; j < c2; j++ )
     {
      System.out.print(result[i][j]+" ");
     }
      System.out.println();
     }
  }
  else
    System.out.print("Multiplication cannot be processed");
  }
    
 }

Output:

 Enter the number of rows of matrix1
 2
 Enter the number columns of matrix 1
 3
 Enter the number of rows of matrix2
 3
 Enter the number of columns of matrix 2
 2
 Enter the elements of matrix1
 2
 3
 4 
 2
 1
 4
 Enter the elements of matrix2
 5
 4
 2 
 3
 5
 3
 Result of multiplication:
 36  29
 32  23

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This tutorial shows how to subtract two matrices in Java. As this program is based on Array and uses of for loop so you may go through the following first.

• Array in Java
• for loop in java

Matrices mean having two-dimension that is there are columns and rows in the following java example.

The Program takes the input for both the column and row elements from the user using the scanner class and a third two-dimensional array is created to store the subtraction result of two matrices. And lastly displays the final result.

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Java Program to Subtract Two Matrices

  //subtraction of matrices in java

  import java.util.Scanner;

  public class SubtractionMatrix
  {
    public static void main(String args[])
    {
      int row, col, i, j;
      Scanner sc = new Scanner(System.in);

      System.out.println("Enter the number of rows");
      row = sc.nextInt();

      System.out.println("Enter the number  columns");
      col = sc.nextInt();

      int mat1[][] = new int[row][col];
      int mat2[][] = new int[row][col];
      int result[][] = new int[row][col];

      //First matrix Input
      System.out.println("Enter the elements of matrix1");
      for (i = 0; i < row; i++)
      {

        for (j = 0; j < col; j++)
          mat1[i][j] = sc.nextInt();
      }

      //Second matrix Input
      System.out.println("Enter the elements of  matrix2");
      for (i = 0; i < row; i++)
      {

        for (j = 0; j < col; j++)
          mat2[i][j] = sc.nextInt();
      }

      //Subtraction
      for (i = 0; i < row; i++)
        for (j = 0; j < col; j++)
          result[i][j] = mat1[i][j] - mat2[i][j];

      System.out.println("Result of subtraction:-");

      for (i = 0; i < row; i++)
      {
        for (j = 0; j < col; j++)
          System.out.print(result[i][j] + "\t");

        System.out.println();
      }
    }
  }

Output:

 Enter the number of rows
 3
 Enter the number  columns
 2
 Enter the elements of matrix1
 4
 6
 8
 1
 2
 6
 Enter the elements of  matrix2
 0
 0
 0
 0
 0
 0
 Result of subtraction:-
 4	 6	
 8	 1	
 2	 6

---

In this tutorial, we will learn how to write a program to add two matrices in Java. As this program is based on Array and uses of for loop so you may go through the following first.

• Array in Java
• for loop in java

Matrices mean having two-dimension that is there are columns and rows in the following java example.

The Program takes the input for both the column and row elements from the user using the scanner class and a third two-dimensional array is created to store the sum result of two matrices. And lastly displays the final result.

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Java Program to Add Two Matrices

  //Addition of a matrix

 import java.util.Scanner;

 public class AdditionOfMatrix
 {
    public static void main(String args[])
    {
      int row, col, i, j;
      Scanner sc= new Scanner(System.in);
    
      System.out.println("Enter the number of rows");
      row = sc.nextInt();
        
      System.out.println("Enter the number  columns");
      col  = sc.nextInt();
    
      int mat1[][] = new int[row][col];
      int mat2[][] = new int[row][col];
      int result[][] = new int[row][col];
    
    //First matrix Input
      System.out.println("Enter the elements of matrix1");
      for (  i= 0 ; i < row ; i++ )
      {   
        for ( j= 0 ; j < col ;j++ )
        mat1[i][j] = sc.nextInt();
      }
        
     //Second matrix Input
      System.out.println("Enter the elements of  matrix2");
      for (  i= 0 ; i < row ; i++ )
       {
         for ( j= 0 ; j < col ;j++ )
         mat2[i][j] = sc.nextInt();
    
       }
    
    //Addition
      for (  i= 0 ; i < row ; i++ )
         for ( j= 0 ; j < col ;j++ )
             result[i][j] =  mat1[i][j] + mat2[i][j]  ;   
    
      System.out.println("Result of Addition:-");
    
      for (  i= 0 ; i < row ; i++ )
      {  
        for ( j= 0 ; j < col ;j++ )
           System.out.print(result[i][j]+"\t");
        
        System.out.println();
     }
    
    }
 }

Output:

 Enter the number of rows
 3
 Enter the number  columns
 2
 Enter the elements of matrix1
 1
 1
 1
 1
 1
 1
 Enter the elements of  matrix2
 1
 1
 1
 1
 1
 1
 Result of Addition:-
 2	 2	
 2 	 2	
 2 	 2

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The following program shows how to insert an element at a specific position in an Array in Java.

The program takes the following as input:

• The size of an array.
• Value of elements of an array.
• The position where the user wants to insert the new element.
• The value of the element itself that the user wants to insert.

Lastly displays the final result where the new elements have been inserted.

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Program to Insert an Element in an Array at a Specified Position in Java

import java.util.Scanner;
public class Insert_Array
{
  public static void main(String[] args)
  {
    int n, x, pos;
    Scanner s = new Scanner(System.in);

    System.out.print("Enter size of an Array: ");
    n = s.nextInt();

    int a[] = new int[n + 1];

    System.out.println("Enter " + n + " elements in an array:");
    for (int i = 0; i < n; i++)
    {
      a[i] = s.nextInt();
    }

    System.out.print("Enter the position where you want to insert new element: ");
    pos = s.nextInt();

    System.out.print("Enter the element you want to insert at " + pos + " position: ");
    x = s.nextInt();

    //insertion
    for (int i = (n - 1); i >= (pos - 1); i--)
    {
      a[i + 1] = a[i];
    }
    a[pos - 1] = x;

    //Displaying after insertion
    System.out.print("Array after insertion: ");
    for (int i = 0; i < n; i++)
    {
      System.out.print(a[i] + " ");
    }
    System.out.print(a[n]);
  }
}

Output:

Enter size of an Array: 5
Enter 5 elements in an array:
1
2
3
4
5
Enter the position where you want to insert new element: 3
Enter the element you want to insert at 3 position: 9
Array after insertion: 1 2 9 3 4 5

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In this tutorial, we will write a java program to print the largest element present in an array. If you do not about the array and for loops working process then click the link below, as this program uses them.

• Array in Java
• for loop in Java

The program below takes the number element and all the values of the elements from the user as input and finds the largest element among them in java.

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Java Program to Find the Largest Element in an Array

 //largest element in an array in java
  
 import java.util.Scanner;

 public class LargestElementsArray 
 {
  public static void main(String[] args) 
  {
    int num, largest;
    Scanner s = new Scanner(System.in);
    
    System.out.print("Enter the number of elements for an array:");
    num = s.nextInt();
    
    int a[] = new int[num];
    
    System.out.println("Enter elements of array:");
    for(int i = 0; i < num; i++)
    {
        a[i] = s.nextInt();
    }
    
    largest = a[0];
    
    for(int i = 0; i < num; i++)
    {
      if(largest < a[i])
      {
        largest = a[i];
      }
    }
    
    System.out.println("Largest elements in an array is:"+largest);
  }
 }

Output:

Enter number of elements in the array:5
Enter elements of array:
4
67
89
32
4
Largest elements in an array is:89

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