Answer: enum and wait method : Questions « Object Oriented « SCJP

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2. Object Oriented
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A  



public class MainClass {
  enum Animals {
    LION(450), TIGER(450), DOG;
    int weight;

    Animals() {
    }

    Animals(int w) {
      weight = w;
    }
  }

  public static void main(String[] argv) {
    try {
      Animals.DOG.wait();
    } catch (InterruptedException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  }
}