Elvis.java

// Enum singleton - the preferred approach - page 18
package org.effectivejava.examples.chapter02.item03.enumoration;

public enum Elvis {
	INSTANCE;

	public void leaveTheBuilding() {
		System.out.println("Whoa baby, I'm outta here!");
	}

	// This code would normally appear outside the class!
	public static void main(String[] args) {
		Elvis elvis = Elvis.INSTANCE;
		elvis.leaveTheBuilding();
	}
}