Print maximum element in matrix

/*
Matix:
7 5 7
9 8 2
1 3 4

Biggest element is 9
*/
import java.util.Scanner;
class max
{
  Scanner sc=new Scanner(System.in);
  int i,j;
  int a[][]=new int[3][3];
  void get_matrix ()
  {
    for(i=0;i<3;i++)
    {
      for(j=0;j<3;j++)
      {
        a[i][j]=sc.nextInt();
      }
    }
  }
  void print_matrix ()
  {
    for(i=0;i<3;i++)
    {
      for(j=0;j<3;j++)
      {
        System.out.print(a[i][j]+" ");
      }
      System.out.println(" ");
    }
  }
  void maxi_matrix()
  {
    int max;
    max=a[0][0];
    for(i=0;i<3;i++)
    {
      for(j=0;j<3;j++)
      {
        if(a[i][j]>max)
        {
          max=a[i][j];
        }
      }
    }
    System.out.println("maximum number is:-"+max);
  }
}
class max_matrix
{
  public static void main(String args[])
  {
    max obj=new max();
    System.out.println("==>Enter  Matrix<==");
    obj.get_matrix();
    System.out.println("==>Matrix<==");
    obj.print_matrix();
    obj.maxi_matrix();
  }
}