public void printInformation() {

    System.out.println("Desktop computers are maid for mainstream use");
    System.out.println("Number of free places in RAM memory: " + numberOfFreePlacesInRAMMemory);
    System.out.println("Is it overclocked computer: " + isOverclock);
    System.out.println("Does it have a CD reader: " + hasCD);
    super.printInformation();
  }
  public void printInformation() {
    super.printInformation();
    String s = "DESKTOP: \n";
    s += "Has empty memory slots? " + this.hasEmptyMemmorySlots + "\n";
    s += "Is overclocked? " + this.isOverclocked + " ''\n";
    s += "Has optical drive?: " + this.hasOpticalDrive + "\n";

    System.out.println(s);
  }