Enumeration in Java Explained | Java Tutorial | Edureka

Jan 3, 20202 likes852 views

YouTube Link: https://youtu.be/LYRDMfJ9OwA **Java, J2EE & SOA Certification Training - https://www.edureka.co/java-j2ee-trai... ** This Edureka video on Java Enum Tutorial will provide you with detailed knowledge about Enumeration in Java along with real times examples for better understanding. This informative video will include the following. Agenda What is Enum? Why we need Enum? Differences between Class and Enum Syntax of Enum Practical Examples of Enum Advantages of using Enum Enum Usecase: Rock Paper Scissor Game Follow us to never miss an update in the future. YouTube: https://www.youtube.com/user/edurekaIN Instagram: https://www.instagram.com/edureka_learning/ Facebook: https://www.facebook.com/edurekaIN/ Twitter: https://twitter.com/edurekain LinkedIn: https://www.linkedin.com/company/edureka Castbox: https://castbox.fm/networks/505?country=in

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WHY DO WE NEED ENUMERATION?
DIFFERENCES BETWEEN ENUM AND CLASS
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WHAT IS ENUMERATION IN JAVA?
PRACTICL EXAMPLES OF ENUM
ADVANTAGES OF ENUM
ENUM USECASE: ROCK PAPER SISSIOR GAME.

WHAT IS ENUMERATION?
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Java Enums are classes that have a fixed set of constants or
variables that do not tend to change. The enumeration in Java is
achieved using the keyword enum. The Java enum Constants
are static and final implicitly.

WHY DO WE NEED ENUMERATION?
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WHY DO WE NEED ENUMERATION?
Thurs Fri SatMon Tue Wed Sun
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WHY DO WE NEED ENUMERATION?
Thurs Fri Satenum week Mon Tue Wed Sun
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WHY DO WE NEED ENUMERATION?
Contract Temporary Permanent
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WHY DO WE NEED ENUMERATION?
Contract Temporary Permanentenum job
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switch (c) {
case 1: one(); break;
case 2: two(); break;
case 3: three(); break;
default: throw Exception;
}
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private static int ONE = 1;
private static int TWO = 2;
private static int THREE = 3;
switch (c) {
case ONE: one(); break;
case TWO: two(); break;
case THREE: three(); break;
default: throw Exception;
}
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enum Action {
ONE { @Override public void action() { } },
TWO { @Override public void action() { } },
THREE { @Override public void action() { } },
public abstract void action();
}
Abstract Method
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enum Action {ONE, TWO, THREE}
Action a = ...
switch (a) {
case ONE: one(); break;
case TWO: two(); break;
case THREE: three(); break;
default: throw Exception;
}
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DIFFERENCES BETWEEN CLASS AND ENUM
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DIFFERENCES BETWEEN CLASS AND ENUM
Class Constants can be overridden
Enum constants cannot be overridden
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Classes support the creation of Objects
Enum cannot support the creation of objects
DIFFERENCES BETWEEN CLASS AND ENUM
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Classes can extend other classes
Enum cannot extend other classes
DIFFERENCES BETWEEN CLASS AND ENUM
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Classes can implement Interface
Enum can implement Interface
DIFFERENCES BETWEEN CLASS AND ENUM
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SYNTAX FOR ENUM IN JAVA
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enum syntax:
enum edureka{constants}

PRACTICAL EXAMPLES OF ENUM
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Copyright © 2017, edureka and/or its affiliates. All rights reserved.
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DEFINING ENUM
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Copyright © 2017, edureka and/or its affiliates. All rights reserved.
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ENUM SWITCH CASE
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Copyright © 2017, edureka and/or its affiliates. All rights reserved.
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INHERITANCE IN ENUM
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Copyright © 2017, edureka and/or its affiliates. All rights reserved.
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ENUM WITH CUSTOMIZED VALUES
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Copyright © 2017, edureka and/or its affiliates. All rights reserved.
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ENUM WITH IF-ELSE
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Copyright © 2017, edureka and/or its affiliates. All rights reserved.
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ENUM METHODS
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Enum can implement Interfaces
Enum has fields, methods and constructors
Enum can be traversed.
Enum is easily usable in Switch Cases.
Enum in Java improves Type-Safety.
ADVANTAGES OF ENUM
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ENUM USECASE: ROCK PAPER SISSORS GAME
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2. WHY DO WE NEED ENUMERATION? DIFFERENCES BETWEEN ENUM AND CLASS www.edureka.co WHAT IS ENUMERATION IN JAVA? PRACTICL EXAMPLES OF ENUM ADVANTAGES OF ENUM ENUM USECASE: ROCK PAPER SISSIOR GAME.

3. WHAT IS ENUMERATION? www.edureka.co

4. WHAT IS ENUMERATION? www.edureka.co Java Enums are classes that have a fixed set of constants or variables that do not tend to change. The enumeration in Java is achieved using the keyword enum. The Java enum Constants are static and final implicitly.

5. WHY DO WE NEED ENUMERATION? www.edureka.co

6. WHY DO WE NEED ENUMERATION? Thurs Fri SatMon Tue Wed Sun www.edureka.co

7. WHY DO WE NEED ENUMERATION? Thurs Fri Satenum week Mon Tue Wed Sun www.edureka.co

8. WHY DO WE NEED ENUMERATION? Contract Temporary Permanent www.edureka.co

9. WHY DO WE NEED ENUMERATION? Contract Temporary Permanentenum job www.edureka.co

10. switch (c) { case 1: one(); break; case 2: two(); break; case 3: three(); break; default: throw Exception; } www.edureka.co

11. private static int ONE = 1; private static int TWO = 2; private static int THREE = 3; switch (c) { case ONE: one(); break; case TWO: two(); break; case THREE: three(); break; default: throw Exception; } www.edureka.co

12. enum Action { ONE { @Override public void action() { } }, TWO { @Override public void action() { } }, THREE { @Override public void action() { } }, public abstract void action(); } Abstract Method www.edureka.co

13. enum Action {ONE, TWO, THREE} Action a = ... switch (a) { case ONE: one(); break; case TWO: two(); break; case THREE: three(); break; default: throw Exception; } www.edureka.co

14. DIFFERENCES BETWEEN CLASS AND ENUM www.edureka.co

15. DIFFERENCES BETWEEN CLASS AND ENUM Class Constants can be overridden Enum constants cannot be overridden www.edureka.co

16. Classes support the creation of Objects Enum cannot support the creation of objects DIFFERENCES BETWEEN CLASS AND ENUM www.edureka.co

17. Classes can extend other classes Enum cannot extend other classes DIFFERENCES BETWEEN CLASS AND ENUM www.edureka.co

18. Classes can implement Interface Enum can implement Interface DIFFERENCES BETWEEN CLASS AND ENUM www.edureka.co

19. SYNTAX FOR ENUM IN JAVA www.edureka.co enum syntax: enum edureka{constants}

20. PRACTICAL EXAMPLES OF ENUM www.edureka.co

28. ADVANTAGES OF ENUM www.edureka.co

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