Need help understanding a line of code from the Java Tutorial

Question

Here is the code I have seen in the Reflection Tutorial:
import java.lang.reflect.*;
class SampleInvoke {
   public static void main(String[] args) {
      String firstWord = "Hello ";
      String secondWord = "everybody.";
      String bothWords = append(firstWord, secondWord);
      System.out.println(bothWords);
   public static String append(String firstWord, String secondWord) {
      String result = null;
      Class c = String.class;
      Class[] parameterTypes = new Class[] {String.class};
      Method concatMethod;
      Object[] arguments = new Object[] {secondWord};
      try {
        concatMethod = c.getMethod("concat", parameterTypes);
        result = (String) concatMethod.invoke(firstWord, arguments);
      } catch (NoSuchMethodException e) {
          System.out.println(e);
      } catch (IllegalAccessException e) {
          System.out.println(e);
      } catch (InvocationTargetException e) {
          System.out.println(e);
      return result;
}There are 2 lines I do not understand (but once I understand one, I'll understand the other).
Here they are:
Class[] parameterTypes = new Class[] {String.class};
Object[] arguments = new Object[] {secondWord};Any explanation will be greatly appreciated :)

Answer 1

There are 2 lines I do not understand (but once I
understand one, I'll understand the other).
Here they are:
Class[] parameterTypes = new Class[]
{String.class};
Object[] arguments = new Object[]
{secondWord};
the first line simply creates an array of objects, the objects are of type Class. It then places the object referenced in the brackets into the array.