Java Programing laungage

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Introduction of Core Java

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Syntax of java Program

Difference between Java and C/C++

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What is Java

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Java has Following Features/Characteristics

Limitation of Java Language and Java Internet

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Simple Program of Java

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Applet and Comments in Java

Tokens in Java

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Literals/Constants

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Operator on Integer and Separators in Java Programming

Java Control Flow of Statements

If and If-else Selection Statement

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for and while Loop

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Statement in Java

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Two Dimensional Array Program

Command Line Argument in Java

String args Types in Java

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Math Class Function and Constant

Math Class all Function used in a program

Enumerated Types in Java

Object Oriented Programming v/s Procedural Programming

Object Oriented Programming Concepts in Java

Introduction to Class,Object and Method in Java

Class Declaration in Java

Class & Objects in java

Encapsulation in Java

Modifiers/Visibility for a Class or Interrface or member of a Class

Polymorphism in Java

Runtime polymorphism (dynamic binding or method overriding)

Enumerated Types in Java
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Enum is a keyword which enum type is a special data type used to define collections of constants. A Java enum type is a special kind of Java class. An enum can contain constants, methods etc. Java enum were added in Java 5. For example Number of days in Week. Enum constants are implicitly static and final and you can not change there value once created. Notice curly braces around enum constants because Enum are type like class and interface in Java. similar naming convention for enum like class and interface (first letter in Caps) and since Enum constants are implicitly static final we have used all caps to specify them like Constants in Java. The names of an enum type's fields are in uppercase letters.

In the Java programming language, you define an enum type by using the enum keyword.

Syntax :

public enum Day 
{
	SUNDAY, MONDAY, TUESDAY, WEDNESDAY,
	THURSDAY, FRIDAY, SATURDAY 
}

The enum keyword which is used in place of class or interface.

Example :

public class EnumTest
{
	public enum Day 
	{
		SUNDAY, MONDAY, TUESDAY, WEDNESDAY,
		THURSDAY, FRIDAY, SATURDAY 
	}
	
	Day day;

	public EnumTest(Day day) 
	{ 
		this.day = day;
	}

	public void tellItLikeItIs()
	{
		switch (day)
		{
			case MONDAY:System.out.println("Mondays are bad.");
						break;

			case FRIDAY:System.out.println("Fridays are better.");
						break;

			case SATURDAY:System.out.println("Weekends are best.");
						break;
		
			 case SUNDAY:System.out.println("Weekends are best.");
						break;

			default:System.out.println("Midweek days are so-so.");
					break;
		}
	}

	public static void main(String[] args)
	{
		EnumTest firstDay = new EnumTest(Day.MONDAY);
		firstDay.tellItLikeItIs();
		EnumTest thirdDay = new EnumTest(Day.WEDNESDAY);
		thirdDay.tellItLikeItIs();
		EnumTest fifthDay = new EnumTest(Day.FRIDAY);
		fifthDay.tellItLikeItIs();
		EnumTest sixthDay = new EnumTest(Day.SATURDAY);
		sixthDay.tellItLikeItIs();
		EnumTest seventhDay = new EnumTest(Day.SUNDAY);
		seventhDay.tellItLikeItIs();
	}
}

output :

Mondays are bad.
Midweek days are so-so.
Fridays are better.
Weekends are best.
Weekends are best.

 

The enum declaration defines a class (called an enum type). The enum class body can include methods and other fields.

All enums implicitly extend java.lang.Enum. Because a class can only extend one parent.

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