import java.util.Random;
import java.lang.Math.*;

public class Matrix
{
 private int n;
 private double[][] M;
 // Initialize random number generator:
 // private static Random R = java.util.Random();

 // constructor
 public Matrix(int n);

 // methods
 public void dump();
 public static void main(String[] args);

 
public Matrix::Matrix(int n)
 { int i; int j;
   M = new double [n][n];
   for (i = 0; i<n; i++)
     for (j = 0; j<n; j++) 
       {
//       M[i][j] = R.nextDouble();
         M[i][j] = Math.random();
//
         System.out.print( M[i][j] + "\t");
       }
 } // Matrix(n)
 
 // methods
 public void Matrix::dump()
 { int i; int j;
   System.out.println("dumping...");
   System.out.println("n = " + n );
   for (i = 0; i<n; i++)
     System.out.println("");
     for (j = 0; j<n; j++)
        System.out.print( M[i][j] + "\t");
 } // dump()


 public static void Matrix::main(String[] args)
 {
   Matrix M = new Matrix(3);
   M.dump();
 } // main

}