testmatrixoperation.java

在java环境中

//TestMatrixOperation.java: Add and multiply two matrices
public class TestMatrixOperation 
{
	//Main method 
	public static void main(String[] args)
	{
		//Create two matrices as two dimensional arrays
		int[][] matrix1 =new int[5][5];
		int[][] matrix2 =new int[5][5];
		
		//Assign random values to matrix1 and matrix2
		for(int i=0;i<matrix1.length;i++)
		 for(int j=0;j<matrix1[i];j++)
		 {
		 	matrix1[i][j]=(int)(Math.random()*10);
		 	matrix2[i][j]=(int)(Math.random()*10);
		 }
		 
		//Add two matrices and print the result
		int[][] resultMatrix=new int[5][5];
		resultMatrix=addMatrix(matrix1,matrix2);
		System.out.println("The addition of the matrices is ");
		printResult(matrix1,matrix2,resultMatrix,'*');
		
		//Multiply two matrices and print the result
		resultMatrix=multiplyMatrix(matrix1,matrix2);
		System.out.println("\nThe multiplication of the matrices is ");
		printlnResult(matrix1,matrix2,resultMatrix,'*');
	}
	
	//The method for adding two matrices
	public static int[][] addMatrix(int[][] m1,int[][] m2)
	{
		int[][] result=new int[m1.length][m1[0].length];
		for(int i=0;i<m1.length;i++)
		 for(int j=0;j<m1[0].length;j++)
		  result[i][j]=m1[i][j]+m2[i][j];
		  
		return result;  
	}
	
	//The method for multiplying two matrices
	public static int[][] multiplyMatrix(int[][] m1,int[][] m2)
	{
		int[][] result=new in[m1[0].length][m2.length];
		for(int i=0;i<m1.length;i++)
		 for(int j=0;j<m2[0].length;j++)
		  for(int k=0;k<m1[0].length;k++)
		   result[i][j] +=m1[i][k]*m2[k][j];
		  
		return result;   
	}
	
	//Print result
	public static void printResult(int[][] m1,int[][] m2,int[][] m3,char op)
	{
		for(int i=0;i<m1.length;i++)
		{
			for(int j=0;j<m1[0].length;j++)
			 System.out.print( " "+m1[i][j]);
			 
			 if(i==m1.length/2)
			  System.out.print( " "+op+" ");
			 else
			  System.out.print( "   " );
			  
			 for(int j=0;j<m2[0].length;j++)
			  System.out.print( ""+m2.[i][j]);
			   
			 if(i==m1.length/2)
			  System.out.print( " = " );
			 else
			  System.out.print( "   " );
			  
			 for(int j=0;j<m3[0].length;j++)
			  System.out.print( ""+m3[i][j]);
			  
			 System.out.print();   
		}
    }
}