Write a Java program that uses multithreading to implement a 3x3 matrix multipli

Question

Write a Java program that uses multithreading to implement a 3x3 matrix multiplication. The specifications for the program are given as follows:

Assume that the content of input matrices A and B are entered by user from standard input (keyboard). Your program needs to calculate: Result = A x B, where A and B are the input matrices, x is the matrix multiplication operation, and Result is the resulting matrix. Implement multithreading in such a way that each thread calculates one element (i.e., multiply the elements of the ith row from matrix A and the jth column from matrix B, and adds the results to get the value to be stored at Result[i, j]).

Thanks

Explanation / Answer

import java.lang.*;

import java.io.*;

class MatMulti extends Thread

{

static int A[][];

static int B[][];

static int Result[][];

static int a=2;

int row;

MatMulti(int i)

{

row=i;

this.start();

}

public void run()

{

int i,j;

for(i=0;i<a;i++)

{

Result[row][i]=0;

for(j=0;j<a;j++)

Result[row][i]=Result[row][i]+A[row][j]*B[j][i];

}

}

public static void main(String args[])

{

int i,j,a=3;

BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

System.out.print("Enter the order of Matrix : ");

try

{

a=Integer.parseInt(br.readLine());

}catch(Exception e){}

A=new int[a][a];

B=new int[a][a];

Result=new int[a][a];

System.out.println("Enter the First Matrix : ");

for(i=0;i<a;i++)

{

for(j=0;j<a;j++)

{

try

{

A[i][j]=Integer.parseInt(br.readLine());

}catch(Exception e){}

}

}

System.out.println("Enter the Second Matrix : ");

for(i=0;i<a;i++)

{

for(j=0;j<a;j++)

{

try

{

B[i][j]=Integer.parseInt(br.readLine());

}catch(Exception e){}

}

}

MatMulti mat[]=new MatMulti[a];

for(i=0;i<a;i++)

mat[i]=new MatMulti(i);

try

{

for(i=0;i<a;i++)

mat[i].join();

}catch(Exception e){}

System.out.println("OUTPUT :");

for(i=0;i<a;i++)

for(j=0;j<a;j++)

System.out.println(Result[i][j]);

}

}

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