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import java.util.EnumMap; enum Weekday { MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY } public class EnumMapExample { public static void main(String[] args) { EnumMap map = new EnumMap<>(Weekday.class); map.put(Weekday.MONDAY, "星期一"); map.put(Weekday.TUESDAY, ...
In Java, an enum (short for enumeration) is a type that has a fixed set of constant values. We use the enum keyword to declare enums. For example, enum Size { SMALL, MEDIUM, LARGE, EXTRALARGE } Here, we have created an enum named Size. It contains fixed values SMALL, MEDIUM, LARG...
public enum State { ACTIVE, NOT_ACTIVE; } public class CurrentState { private State state; public State getState() { return state; } public void setState(State state) { this.state = state; } } public class SomeObject { private CurrentState state; public SomeObject(CurrentState state) { ...
name()); } } public class EnumExample { public static void main(String[] args) { Color color = Color.RED; System.out.println(color); // 输出 RED color.printColor(); // 输出 RED } } 在上述示例中,Color 是一个枚举类型,包含了三个枚举常量:RED、GREEN 和BLUE。这些枚举常量实际上是 ...
And due to interfaces and the power of delegation, both the drink type and the drink enum can be processed in the same manner, as with the following example program: public final class DrinkEnumExample { public interface DrinkTypeInterface { String getDisplayableType(); } public static enum ...
Declaration of enum in Java:Enum declaration can be done outside a Class or inside a Class but not inside a Method. Java // A simple enum example where enum is declared // outside any class (Note enum keyword instead of // class keyword) ...
This is the common base class of all Java language enumeration classes. More information about enums, including descriptions of the implicitly declared methods synthesized by the compiler, can be found in section { Added in 1.5. Java documentation for java.lang.Enum. Portions of this page are ...
Java enum example. The purpose of enum is to enforce compile time type safety. Learn enum constructors, methods, inheritance, EnumMap and EnumSet etc.
As we cannot extend enum in Java, it is also impossible for any class to extend an enum. Let’s learn by using the following example code and see what happens. Example Code: package delftstack; enum Cars { Audi, BMW, Marcedes } public class Example extends Cars { public static void ...