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December 26, 2009

Here are questions 3 and 4 in the java-question series:

Question 3: Will this compile? If not, why? If so, why would I ask this question? 
import java.awt.*;
import java.util.*;
enum TrafficLight {
  GREEN(Color.green),
  YELLOW(Color.yellow),
  RED(Color.red);

  private final static Map<Color,TrafficLight> 
    INSTANCES = new HashMap<Color,TrafficLight>();

  private final Color c;
  private TrafficLight(Color c) {
    this.c = c;
    INSTANCES.put(c,this);
  }

  public static TrafficLight getInstance(Color c) {
    return INSTANCES.get(c);
  }	
}

Question 4: If you answered No to the first question, what should be done with the person who designed enums to make this so?
Answer 4: Drug out to the barn and shot.

Posted by jeff at December 26, 2009 01:13 PM