/**
 * 
 */
package de.fhswf.in.inf.java1.aufgabe04;

import java.util.Arrays;

/**
 * Tests the different methods to created a prefilled String.
 *
 * @author $Author: $
 * @version $Revision: $, $Date: $ UTC
 */
public final class Fill
{
   private Fill()
   {
   }

   /**
    * 
    * Creates a string of given length filled with the given char.
    *
    * @param length
    *           Length of the returned String.
    * @param c
    *           Char the String is filled with.
    * @return Returns the generated String.
    */
   public static String createStringFilledWith(int length, char c)
   {
      // String that will be returned
      String result = "";
      for (int i = 0; i < length; i++)
      {
         // Every iteration, a new string is created.
         result += c;
      }
      // Return the build string
      return result;
   }

   /**
    * 
    * Creates a string of given length filled with the given char.
    *
    * @param length
    *           Length of the returned String.
    * @param c
    *           Char the String is filled with.
    * @return Returns the generated String.
    */
   public static String createStringFilledWith2(int length, char c)
   {
      // charArray that will be returned
      char[] result = new char[length];

      Arrays.fill(result, c);

      // Return the build string
      return result.toString();
   }

   /**
    * 
    * Creates a string of given length filled with the given char.
    *
    * @param length
    *           Length of the returned String.
    * @param c
    *           Char the String is filled with.
    * @return Returns the generated String.
    */
   public static String createStringFilledWith3(int length, char c)
   {
      // String that will be returned
      StringBuilder result = new StringBuilder(length);
      for (int i = 0; i < length; i++)
      {
         // Every iteration, a new string is created.
         result.append(c);
      }
      // Return the build string
      return result.toString();
   }

   /**
    * 
    * Calls the function createStringFilledWith() and measures its runtime.
    *
    * @param args
    *           Console line arguments.
    */
   public static void main(String[] args)
   {
      final int anzDurchlaefe = 100000000;

      long start;
      start = System.currentTimeMillis(); // Gets current time in �s
      Fill.createStringFilledWith(anzDurchlaefe, 'x'); // Function call
      // Calculates the time runtime of creatStringFilledWith()
      System.out.println("Elapsed time: "
            + (System.currentTimeMillis() - start) + " ms");

      start = System.currentTimeMillis(); // Gets current time in �s
      Fill.createStringFilledWith2(anzDurchlaefe, 'x'); // Function call
      // Calculates the time runtime of creatStringFilledWith2()
      System.out.println("Elapsed time: "
            + (System.currentTimeMillis() - start) + " ms");

      start = System.currentTimeMillis(); // Gets current time in �s
      Fill.createStringFilledWith3(anzDurchlaefe, 'x'); // Function call
      // Calculates the time runtime of creatStringFilledWith3()
      System.out.println("Elapsed time: "
            + (System.currentTimeMillis() - start) + " ms");
   }
}