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Showing posts from November, 2012

Different ways to use enum's in java

Technique:  Simple enum and retrieve/reverse lookup using valueOf() public class OrderService {     // Note : enums can be defined in its own file or inside a class if they are only relevant with it.     public enum Status { PROCESSING, SHIPPED, COMPLETED; }     public void update(long orderId, Status status) {          // something     } } // import static OrderService.Status; // import static OrderService.Status.* ; // OrderService service = new OrderService(); // service.update(100L, SHIPPED); // use enum // Status status = Status.valueOf("SHIPPED"); // reverse lookup by constant, throws IllegalArgumentException if no match. // System.out.println ( status.toString() ); // prints value - SHIPPED Technique:  Stores enum constant and value in a map, retrieve/reverse lookup using fromValue() public enum Status {         PROCESSING("processing"), SHIPPED("shipping"), COMPLETED("completed");               private S