Invoke a method with Reflection

import java.lang.reflect.Method;

public class Main {
  public static void main(String[] args) throws Exception {
    Class cls = java.lang.Math.class;
    Method m = cls.getMethod("sqrt", new Class[] { double.class });
    printTable(10,m);
  }

  public static void printTable(int n, Method f) {
    System.out.println(f);
    try {
      Object[] args = { new Double(n) };
      Double d = (Double) f.invoke(null, args);
      double y = d.doubleValue();
      System.out.println(y);
    } catch (Exception e) {
      System.out.println(e);
    }
  }
}