Answer to Question #253489 in Python for shishi

Question

Write a program in Java to perform the following operations on Matrix

using multithreading. Get the required input matrix from the user and after

that run three threads to perform the following operation.

a. Addition

b. Subtraction

c. Multiplication

Answer 1

import java.util.Scanner;
public ​class Main
{
    
	public static void main(String[] args) {
		Scanner input=new Scanner(System.in);
		System.out.println("Enter number of rows: ");
		int rows=input.nextInt();
		System.out.println("Enter number of columns: ");
		int cols=input.nextInt();
		int [][] matrix1=new int [rows][cols];
		int [][] matrix2=new int [rows][cols];
		System.out.println("Enter first matrix: ");
		for(int i=0;i<rows;i++){
		    for(int j=0;j<cols;j++){
		        matrix1[i][j]=input.nextInt();
		    }
		}
		
		System.out.println("Enter second matrix: ");
		for(int i=0;i<rows;i++){
		    for(int j=0;j<cols;j++){
		        matrix2[i][j]=input.nextInt();
		    }
		}
		//addition
		Matrix thread1=new Matrix();
		thread1.addition(matrix1,matrix2,rows,cols);
		
		//subtraction
		Matrix thread2=new Matrix();
		thread2.subtraction(matrix1,matrix2,rows,cols);
		//multiplication
		Matrix thread3=new Matrix();
		thread3.multiplication(matrix1,matrix2,rows,cols);
		
	}
}
class ​Matrix extends Thread{
    public void addition(int [][] A, int [][] B, int r, int c){
        int [][] sum=new int[r][c];
        for(int i=0;i<r;i++){
            for(int j=0;j<c;j++){
		        sum[i][j]=A[i][j]+B[i][j];
		    }
		}
		System.out.println("The first matrix + second matrix is: ");
		for(int i=0;i<r;i++){
            for(int j=0;j<c;j++){
                System.out.print(sum[i][j]+" ");
		    }
		    System.out.println();
		}
    }
    public void subtraction(int [][] A, int [][] B, int r, int c){
        int [][] sub=new int[r][c];
        for(int i=0;i<r;i++){
            for(int j=0;j<c;j++){
		        sub[i][j]=A[i][j]-B[i][j];
		    }
		}
		System.out.println("The first matrix - second matrix is: ");
		for(int i=0;i<r;i++){
            for(int j=0;j<c;j++){
                System.out.print(sub[i][j]+" ");
		    }
		    System.out.println();
		}
    }
    public void multiplication(int [][] A, int [][] B, int r, int c){
        int [][] mul=new int[r][c];
        for(int i=0;i<r;i++){    
            for(int j=0;j<c;j++){    
                mul[i][j]=0;      
                for(int k=0;k<r;k++)      
                    {      
                    mul[i][j]+=A[i][k]*B[k][j];      
                    } 
            }   
        }    
		System.out.println("The first matrix * second matrix is: ");
		for(int i=0;i<r;i++){
            for(int j=0;j<c;j++){
                System.out.print(mul[i][j]+" ");
		    }
		    System.out.println();
		}
    }