Why do we need Set and Map for Java Enum

Why do we need Set and Map for Java Enum

Content Index :

Why do we need Set and Map for Java Enum
Tag : java , By : Tonci Grgin
Date : November 24 2020, 01:01 AM

To fix this issue Consider a scenario where you are defining flyweight for each shape object like:
public enum SHAPE {
public double calculateArea(SHAPE shape) {
    Figure figure = map.get(shape);//you dont create object but take it from a map
    return figure.calculate();
enum COLORS {

No Comments Right Now !

Boards Message :
You Must Login Or Sign Up to Add Your Comments .

Share : facebook icon twitter icon

java 1.6 enum issue com.ibm.ws.webservices.engine.enum.Style.WRAPPED

Tag : java , By : artifex
Date : March 29 2020, 07:55 AM
Any of those help I have found the solution to my question by myself, though it took long time, so here is the solution.
change com.ibm.ws.webservice.engine.enum to com.ibm.ws.webservice.engine.enumtype add "com.ibm.ws.webservices.thinclient_7.0.0.jar" to your classpath and recompile the code.

What is the pros and cons between Enum and enum-based class implementation in Java?

Tag : java , By : user130518
Date : March 29 2020, 07:55 AM
Does that help In Java, Enum types act as a class that is declared with their unique name. It is pretty much like the any other class that is designed to create constant values. Recently, I also came across to an info that before the declaration of Enums in Java, an enum like class was created. Just like the article that was suggested on this question, it seems that previous to JVM 1.5, class based enums were widely used.
You can check this source: http://javarevisited.blogspot.com/2011/08/enum-in-java-example-tutorial.html

Why the java method Enum.valueof invoke the enum type constructor?

Tag : java , By : Chris Tattum
Date : March 29 2020, 07:55 AM
I wish this help you It isnt the method valueOf that calls the constructor.
The constructor of an enum is called for every literal when the class is first used. So in your case thats before the first call to Enum.valueOf.

What is the best way to set class variable which is an enum based on some conditional logic on a dependent enum in java?

Tag : java , By : Matt Croydon
Date : March 29 2020, 07:55 AM
it helps some times I am trying to map values from one enum to the other based on some calculation or conditional logic that I need to perform to set the correct enum value for the class variable. How can I do this without using too many if/else, switch statements? , Using predicates as I said would look like this:
public enum Brand {

public enum Engine {

public class Entry {
    public final Predicate<Car> pred;
    public final Engine engine;

    public Entry(Predicate<Car> pred, Engine engine) {
        this.pred = pred;
        this.engine = engine;

public class Car {
    int model;
    int year;
    Engine engine;

    public void carEngineCalculator(Brand b) {
        Car mycar = new Car();

        List<Entry> cases = new ArrayList<>();
        cases.add(new Entry(c -> c.isSuperCar(b) && c.isCrazyGood(b), Engine.LEVEL1));
        cases.add(new Entry(c -> c.isSuperCar(b) && !c.isCrazyGood(b), Engine.LEVEL2));
        cases.add(new Entry(c -> !c.isSuperCar(b), Engine.LEVEL3));

        mycar.engine = cases.stream().filter(x -> x.pred.test(mycar)).findFirst().get().engine;


    public boolean isSuperCar(Brand b) {
        if ((b == Brand.FERRARI) || (b == Brand.PAGANI)) {
            return true;
        return false;

    public boolean isCrazyGood(Brand b) {
        return false;

How to use the value of a string in an enum as an input to output the rest of the data for that enum item in Java?

Tag : java , By : mckasty
Date : March 29 2020, 07:55 AM
this will help The collection Element.values() contains all the values of your enum class.
After the user gives input, loop through this collection and check the symbol property to find the element.
public static void main(String[] args) {
    Scanner reader = new Scanner(System.in);
    boolean found = false;
    do {
        System.out.println("Enter the symbol of an element in the periodic table. ");
        String input = reader.nextLine().trim();

        for (Element e : Element.values()) {
            if (e.symbol.equals(input)) {
                found = true;
                System.out.println("Element: " + e + " (" + e.symbol + ")" + "\nGroup: " + e.group + "\nAtomic Mass: " + e.weight);
        if (!found)
            System.out.println("That symbol is not valid. Please try again. ");
    } while (!found);
Related Posts Related QUESTIONS :
  • How can I set the initial Delay after pressing the start Button to a specific time (HH:mm:ss) format
  • How to switch between Android devices during the tests
  • How to configure java.util.logging via properties to use standard output?
  • How to iterate through array in order
  • Is there better way of iteration to find the evenly divisible number?
  • How do I avoid using if statements with a large amount of variables in java
  • Writing JUnit test cases for a Spring Boot Service Application with autowired components
  • Cors for GET with Postman not showing headers
  • Printing values in different column same row using APACHE POI
  • Fully decompile java6 web application
  • Passing keycloak configuration parameters in the code rather than reading from application.properties
  • setDataSource() IO exception
  • Unexpected Output while retrieving Data from mongodb and displaying in a csv file?
  • Algorithm for searching a value in two arrays
  • How to avoid casting with generic return values?
  • Java/RegEx - Negation of pattern not working
  • How to split a string to non empty words if it might include a separator like tab on first place
  • Supplier<Sequence<String>> cannot be iterated more than once
  • Why there is only one thread can actually started in @PostConstruct method?
  • Manage CompletionStage inside of Netty handler
  • Url Problem while Developing on Localhost and deploy on Remote Virtual Server
  • How to identify the missing type id in Jackson error?
  • android data binding error: cannot find symbol
  • Spring Boot application with a jar dependency does not run after maven build
  • Spring Data JPA query , filter ? search engine ? JPQL?
  • Why LiveData returns null in ViewModel?
  • what this line of code mean....new URLClassLoader(new URL[0],getClass().getClassLoader());
  • Why do need to use new Random() instead of just Random Randomnum?
  • I want to access zk components from the java file
  • How do I cast FieldValue.serverTimestamp() to Kotlin/Java Date Class
  • Insertion Sort Double Array with User Input - JAVA
  • Creating 2 dimesional array with user input and find sum of specific columns
  • can not get Advertising ID Provider in android
  • Convert list of Objects to map of properties
  • How to represent an undirected weighted graph in java
  • Return values as array from collection
  • ByteBuddy generic method return cast to concrete type
  • ImageView hides the round corners of the parent
  • Is there a way to find setter method by its getter method or vice versa in a class?
  • Get aggregated list of properties from list of Objects(Java 8)
  • Unable to find a document in Mongodb where exact date match in java
  • UsernamePasswordAuthenticationFilter skips success handler
  • Use Java filter on stream with in a stream filter
  • Default Login not successful in spring boot 2.1.7
  • Adding key value pairs from a file to a Hashmap
  • Rub regex: matching a char except when after by another char
  • Convert Base64 String to String Array
  • Escape Unicode Character 'POPCORN' to HTML Entity
  • An empty JSON field which is a boolean/nullable field in Java model, is getting converted as null
  • Mongo java driver cannot find public constructor for interface
  • How to unit test writing a file to AWS Lambda output stream?
  • How to make a GitHub GraphQL API Call from Java
  • What's the difference between @ComponentScan and @Bean in a context configuration?
  • Expected class or package adding a view using a class
  • can be delete of a element in a static array be O(1)?
  • Instance variable heap or stack ? ( with specific example)
  • Assert progress of ProgressBar in Espresso test
  • How to detect if gson.fromjson() has excess elements
  • I cant generate the proper code to select the a specific filter on a BI dashboard I am working on
  • How to Inject Dependencies into a Servlet Filter with Spring Boot Filter Registration Bean?
  • shadow
    Privacy Policy - Terms - Contact Us © scrbit.com