Enum that implements interfaces

Enum can implement any interfaces. All enum types implicitly implements java.io.Serializable, and java.lang.Comparable.

public enum Color implements Runnable {
WHITE, BLACK, RED, YELLOW, BLUE;

public void run() {
System.out.println("name()=" + name() +
", toString()=" + toString());
}
}

A sample test program to invoke this run() method:

for(Color c : Color.values()) {
c.run();
}

Or,

for(Runnable r : Color.values()) {
r.run();
}