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* Project Name:   Matrix multiplication using java
* Programmer:   msi_333
* Type:   Math
* Technology:  Java
* IDE:   NetBeans
* Description:   The matrix mutliplication of any size to any size.We are using here thread of java for multiplication.

How to work :
User enter the number of rows and columns in matrix A and matrix B.
The number of columns in matrix A must equal the number of rows in matrix B.
Then,
The user enter the elements of matrix A.
The user enter the elements of matrix B.

java code
`package matrix_multiplication;import java.util.Scanner;public class Main {        /** Creates a new instance of Main */    public Main()     {        Scanner cin=new Scanner(System.in);        System.out.println("Enter the number of rows in matrix A : ");        A_row=cin.nextInt();        System.out.println("Enter the number of columns in matrix A : ");        A_col=cin.nextInt();        System.out.println("Enter the number of rows in matrix B : ");        B_row= cin.nextInt();        System.out.println("Enter the number of columns in matrix B : ");        B_col=cin.nextInt();                if(A_col==B_row)        {            matrix_A=new int[A_row][A_col];            matrix_B=new int[B_row][B_col];            mult_ans=new int[A_row][B_col];          System.out.println("Enter the elements of matrix A : ");             for(int i=0;i<A_row;i++)                 for(int j=0;j<A_col;j++)                 {                    matrix_A[i][j]=cin.nextInt();                 }          System.out.println("Enter the elements of matrix B : ");            for(int i=0;i<B_row;i++)                 for(int j=0;j<B_col;j++)                 {                    matrix_B[i][j]=cin.nextInt();                   }             thread_pool=new mythread[A_row];                         for(int i=0;i<A_row;i++)            {                thread_pool[i]=new mythread(i);                thread_pool[i].start();            }           System.out.println("The answer of the matrix A*B : ");              printer_thread=new threadprint[3];                printer_thread[2]=new threadprint(mult_ans);                printer_thread[2].start();                                                 }        else        {           System.out.print("!!! Can't multiply this matrixes !!! ");         }             }        /**     * @param args the command line arguments     */    public static void main(String[] args) {                        new Main();                        // TODO code application logic here    }         private class mythread extends Thread    {        int index;                  mythread(int index)         {             this.index=index;         }        public void run()         {            for(int i=0;i<B_col;i++)            {                for(int j=0;j<B_col;j++)                {                    mult_ans[index][i]+=matrix_A[index][j]*matrix_B[j][i];                }            }        }    }    private class threadprint extends Thread    {        threadprint (int[][] matrix)        {            this.matrix=matrix;        }        public synchronized  void run()        {            for(int i=0;i<matrix.length;i++)            {                System.out.print("| ");                for(int j=0;j<matrix[0].length;j++)                {                  System.out.print(matrix[i][j]+"  ");                }                System.out.println(" |");            }        }        int[][] matrix;    }                private int A_row;    private int A_col;    private int B_row;    private int B_col;    private int[][] matrix_A;    private int[][] matrix_B;    private int[][] mult_ans;    private mythread[] thread_pool;    private threadprint[] printer_thread;}`

 Attachments: File comment: Project code Matrix_multiplication.rar [12.32 KiB] Downloaded 1251 times

_________________
M. S. Rakha, Ph.D.
Queen's University
Canada
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updated.

_________________
M. S. Rakha, Ph.D.
Queen's University
Canada

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### Topic Tags

Java Arrays, Java Math

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