java enum tutorial

java_enum.java

package org.srkim.test;


public class java_enum {
//	public enum Currency {PENNY, NICKLE, DIME, QUARTER};
//	public enum Currency {PENNY(1), NICKLE(5), DIME(10), QUARTER(25)};
	public enum Currency {
		PENNY(1) { @Override public String color() {return "copper";}}, 
		NICKLE(5) { @Override public String color() {return "bronze";}}, 
		DIME(10) { @Override public String color() {return "silver";}}, 
		QUARTER(25) { @Override public String color() {return "silver";}};
		private int value;

		public abstract String color();
		private Currency(int value) {
			this.value = value;
		}
	    
		@Override
		public String toString() {
			switch (this) {
			case PENNY:System.out.println("Penny: " + value);break;
			case NICKLE:System.out.println("Nickle: " + value);break;
			case DIME:System.out.println("Dime: " + value);break;
			case QUARTER:System.out.println("Quarter: " + value);
			}
			return super.toString();
		}
	    
//		@Override
//		public void run() {
//			System.out.println("Enum in Java implement interfaces");
//		}
	};
	public static void main(String[] args) {
		Currency usCoin = Currency.DIME;
	    switch (usCoin) {
	            case PENNY:
	                    System.out.println("Penny coin");
	                    break;
	            case NICKLE:
	                    System.out.println("Nickle coin");
	                    break;
	            case DIME:
	                    System.out.println("Dime coin");
	                    System.out.println(usCoin.value);
	                    break;
	            case QUARTER:
	                    System.out.println("Quarter coin");
	    }
	    
	    if(usCoin == Currency.DIME){
	       System.out.println("enum in java can be "+
	               "compared using ==");
	    }
	    
	    for(Currency coin: Currency.values()){
	        System.out.println("coin: " + coin);
	    }
	    
	    System.out.println(usCoin);
	    System.out.println("Color: " + Currency.DIME.color());
	    
	    System.out.println(Currency.DIME.name());
	    System.out.println(Currency.DIME.ordinal());
	    System.out.println(Currency.valueOf("PENNY"));
	}
}