Program to find maximum and minimum number for a n*n matrix

import java.io.*;
 class test
 {
 public static void main(String[] asd)throws IOException
 {
 BufferedReader obj=new BufferedReader(new InputStreamReader(System.in));
 System.out.println("Enter the values of Rows and Columns of Matrix.");
 String num=obj.readLine();
 int r=Integer.parseInt(num);
 num=obj.readLine();
 int c=Integer.parseInt(num);
 int m[][]= new int[r][c];
 int max=0, min=0;
 System.out.println("Enter the values of the matrix not more then "+(r*c)+".");
 for(int i=0;i<r;i++)
 for(int j=0;j<c;j++)
 {
 num=obj.readLine();
 m[i][j]=Integer.parseInt(num);
 }
 System.out.println("Original matrix::");
 for(int i=0;i<r;i++)
 {
 for(int j=0;j<c;j++)
 {
 System.out.print(m[i][j]+" ");
 }
 System.out.println();
 }
 // MAXIMUM element of the matrix max=m[0][0];
 for(int i=0;i<r;i++)
 {
 for(int j=0;j<c;j++)
 {
 if(m[i][j]>max) max=m[i][j];
 }
 }
System.out.println("Maximum of the matrix is "+max+".");
//MINIMUM element of the matrix min=m[0][0];
 for(int i=0;i<r;i++)
 {
 for(int j=0;j<c;j++)
 {
 if(m[i][j]<min) min=m[i][j];
 }
 }
 System.out.println("Minimum of the matrix is "+min+".");
 }
 }