Java枚举

 

import java.util.EnumSet;

import java.util.HashMap;

import java.util.Map;

/**
 *
 * Define the error code and the error message
 *
 * Attention:Error code before 300 is reserve for system define error.Add you
 * error code after 300.
 *
 * @author c_rli
 *
 * @version 1.0 Apr 3, 2009
 */

public enum ErrorCode {

 /** The <tt>enum</tt> of the CONTACT_ID_EMPTY */

 CONTACT_ID_EMPTY("CM01",

 "The member Id must not be empty", ""),

 /** The <tt>enum</tt> of the NO_EXCHANGE_HISTORY */

 NO_EXCHANGE_HISTORY("CM02", "No Exchange History Found",

 ""),

 UNABLE_TO_INSERT_A_RECORD("ERR0419",

 "Unable to insert a record.", ""),

 UNABLE_TO_UPDATE_A_RECORD("ERR0420",

 "Unable to update a record.", ""),

 UNABLE_TO_DELETE_A_RECODE("ERR0421",

 "Unable to delete a Record.", "");

 /** The error code */

 private String code;

 /** The error description */

 private String description;

 /** The error type */

 private String type;

 /**
  *
  * The <tt>Map</tt> of the error code
  */

 private static final Map<String, ErrorCode> LOOKUP = new HashMap<String, ErrorCode>();

 static {

  for (ErrorCode s : EnumSet.allOf(ErrorCode.class)) {

   LOOKUP.put(s.getCode(), s);

  }

 }

 /**
  *
  * @param code
  *            The error code
  *
  * @param description
  *            The error description
  *
  * @param type
  *            the error type
  */

 private ErrorCode(String code, String description, String type) {

  this.description = description;

  this.code = code;

  this.type = type;

 }

 public String getDescription() {

  return description;

 }

 public String getCode() {

  return code;

 }

 public String getType() {

  return type;

 }

 /**
  *
  * The static method to get <tt>ErrorCode</tt> instance by the error code
  *
  *
  *
  * @param code
  *            The error code
  *
  * @return the instance of the <tt>ErrorCode</tt>
  */

 public static ErrorCode get(String code) {

  return LOOKUP.get(code);

 }

 
 public static void main(String[]  args){
  
  ErrorCode error=ErrorCode.get("ERR0419");
  System.out.println(error.getDescription()+error.CREDIT_CARD_CITY_EMPTY);
 }
}