title: Edit Classes in Runtime
body: <p>My program read's a file with 5 parameters about a unit.
  I have established a unit class with these parameters however it was asked now to be able to read another file, this one had 6 parameters but it got me thinking if i could get a file with 10+ parameters and my unit class would not be ready to store all that data, so i was wondering if i could add more variables to a class in runtime.</p>
  
  <p>Sample</p>
  
  <p>Unit Class</p>
  
  <pre><code>public class Unit implements Serializable {
  
      private String name;
      private String unitId;
      private byte year;
      private String semester;
      private String type;
      private int credits;
  
      public Unit(String name, String unitId, byte year, String semester, int credits) {
          setName(name);
          setUnitId(unitId);
          setYear(year);
          setSemester(semester);
          setType(null);
          setCredits(credits);
      }
  
      public Unit(String name, String unitId, byte year, String semester, String type, int credits) {
          setName(name);
          setUnitId(unitId);
          setYear(year);
          setSemester(semester);
          setType(type);
          setCredits(credits);
      }
      // Set's get's and all that stuff.
  
  }
  </code></pre>
  
  <p>Sample code to read the files</p>
  
  <pre><code>Scanner input = new Scanner(f);
  ArrayList&lt;Unit&gt; units = new ArrayList();
  while (input.hasNext()) {
      String str = input.nextLine();
      if (ignoreFirstLine) {
          ignoreFirstLine = false;
      } else {
          String[] ArrayStr = str.split(";");
          if(ArrayStr.length == 5){
              Unit unit = new Unit(ArrayStr[0], ArrayStr[1], Byte.parseByte(ArrayStr[2]), ArrayStr[3], Integer.parseInt(ArrayStr[4]));
              units.add(unit);
          } else if (ArrayStr.length == 6){
              Unit unit = new Unit(ArrayStr[0], ArrayStr[1], Byte.parseByte(ArrayStr[2]), ArrayStr[3], ArrayStr[4], Integer.parseInt(ArrayStr[5]));
              units.add(unit);
          } else {
              //Modify classes in Runtime?
          }
  </code></pre>
  
  <p>edit: My english is amazing :D</p>