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APRIL 25th, LONDON – Simon Maple, Robert Rees and The London Java Community meet for a session taking a tour of the Java class loading mechanism, both from JVM and developer point of view. Looking at typical problems that you get with class loading and how to solve them. See the SkillsCast (Video, code, slides) at: skillsmatter.com/podcast/java-jee/do-you-really-get-class...
19 Jul 2005 Semboro Borsig 0-4-4-0T's 30 & 31 (1908) 700mm gauge stored in the shed. I believe these have now been scrapped.
Enum in Java is the short form of Enumeration. The Java Enum class defines a list of constants whose values we cannot change. It is similar to the final variable. We always define the Enum constants in the upper case. In this article, we will see how to enumerate in Java.
Syntax of declaring an Enum (Enumeration)
To declare an enum we must use the enum keyword followed by the variable. Inside the curly braces, we declare the constants separated by a comma.
enum Speed {
SLOW, MEDIUM, FAST
}
Speed - represents the Enum variable name
The values inside the curly braces represent the Enum constants.
Features of Enum (Enumeration)
- We must always define the enum constants using upper case
- We can declare an enum either inside or outside the class
- Enum is a class and every constant is an object of an enum type.
- We can declare fields and methods inside an enum
- Each enum constant is separated by a comma and should end with a semicolon if an enum contains methods as well.
Accessing Enum constants in Java
We can access enum constants in 2 different ways:
- Creating an enum variable: We can create an enum variable by assigning the enum constant to it. We can use this variable to print the value.
enum Speed {
SLOW, MEDIUM, FAST
}
Speed s = Speed.MEDIUM;
System.out.println(d);
- Using enum name: We can directly access the constant using the enum name.
enum Speed {
SLOW, MEDIUM, FAST
}
System.out.println(Speed.SLOW);
Using
13 Jul 2005 Maschinenfabrik Esslingen Class E10 0-10-0RT E.1060 (1966) 3ft 6 in gauge departs Ambarawa with a charter to Jambu at the bottom of the rack section. This loco came from West Sumatra and although a rack tank was not compatible with the line here and returned to West Sumatra in 2008.
The outer walls of the lower tiers are higher than my head. As you walk along in a clockwise direction, you can follow storylines in the relief images carved into the stone blocks.
We drove across the island of Java from Semarang to Borobudur, and back. We were on a 50-seater coach, and had a police escort all the way, forcing through the heavy traffic. A glimpse at what it must be like to be a VIP!