Largest among all in Java

import java.util.Scanner;
class Sample
{
  public static void main(String[] args)
  {
    int a[];
    int max,i,n;
    Scanner sc = new Scanner(System.in);
    System.out.println("Enter the number: ");
    n = sc.nextInt();
    a = new int[n];
    System.out.println("The Largeest of all is "+max);
  }
    static int maximum(int[] a,int n)
    {
      int i;
      int m = 0;
      for(i = 0;i<n;i++)
      {
        if(a[i]>m)
        {
          m = a[i];
        }
      }
    return m;
    }
}