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5 sty 2024 · A quick and practical guide to the use of the Java Enum implementation, what it is, what problems it solves and how it can be used to implement commonly used design patterns.
An enum is a special "class" that represents a group of constants (unchangeable variables, like final variables). To create an enum, use the enum keyword (instead of class or interface), and separate the constants with a comma. Note that they should be in uppercase letters: Example. enum Level { LOW, MEDIUM, HIGH }
Enum to typ wyliczeniowy, który umożliwia w Javie zadeklarowanie ograniczonej liczby możliwych wartości. Przydatny np. w przypadku deklaracji statusów procesu. Prosty enum. Osobna klasa: public enum Kolor { CZERWONY, ZIELONY, NIEBIESKI; } Wewnętrzna klasa: public class EnumTest { public enum Kolor { CZERWONY, ZIELONY, NIEBIESKI; } }
An enum type is a special data type that enables for a variable to be a set of predefined constants. The variable must be equal to one of the values that have been predefined for it. Common examples include compass directions (values of NORTH, SOUTH, EAST, and WEST) and the days of the week.
4 paź 2024 · Learn how to declare, use, and manipulate enums in Java, a class type that represents a group of named constants. See examples of enum properties, methods, constructors, switch statements, and inheritance.
Learn about the common base class of all Java language enumeration types, Enum, and its methods and constructors. See how to use enums, compare them, and access their names and ordinals.
Learn about the common base class of all Java language enumeration classes, its constructors, methods, and nested classes. See the Java Language Specification for details on enum classes, serialization, and comparison.
