Usage Enums provide a way to define a collection of constants in a type-safe manner. They can include methods and fields, and they can implement interfaces. Syntax EnumName: The name of the enum. CONSTANT1, CON
Code 2:EnumConstructor.java 下面是枚举类型中的构造方法使用 public class EnumConstructor { //constructor usage enum SexEnum{ male("I am a man"), famle("I am a woman"), shemale("I am a shemale"); private String description; private SexEnum(String str){ this.description=str; } public St...
This is just a basic way to use enums with values in Java, but there’s much more to learn about using enums effectively. Continue reading for more detailed information and advanced usage scenarios. Table of Contents[hide] Defining and Using Enums with Values in Java Advanced Enums: Switch...
This article introduces you to the difference between enumerated types and typesafe enums. You will learn how to declare a typesafe enum and use it in a switch statement, and you’ll see how to customize a typesafe enum by adding data and behaviors. We’ll also take a look atjava.lang....
info("Loading class in path: [{}]", resourcePath); try (InputStream in = Thread.currentThread().getContextClassLoader().getResourceAsStream(resourcePath)) { //noinspection UnstableApiUsage return ByteStreams.toByteArray(Objects.requireNonNull(in)); } catch (IOException e) { throw new Run...
toStringin classObject Returns: the name of this enum constant hashCode public final int hashCode() Returns a hash code for this enum constant. Overrides: hashCodein classObject Returns: a hash code for this enum constant. See Also: Object.equals(java.lang.Object),System.identityHashCode(java....
Here is a simple Java enum example: public enum Level { HIGH, MEDIUM, LOW } Notice theenumkeyword which is used in place ofclassorinterface. The Javaenumkeyword signals to the Java compiler that this type definition is an enum. You can refer to the constants in the enum above like this...
System.err.println("Usage: java Planet <earth_weight>"); System.exit(-1); }doubleearthWeight=Double.parseDouble(args[0]);doublemass=earthWeight/Planet.EARTH.getSurfaceGravity();for(Planet p:Planet.values()){ System.out.printf("Weight on %s is %f%n", p, p.surfaceWeight(mass)); ...
The normal usage of Enums is to define an Enum subclass for each enumeration data type, and to define a set of public final static constants in that class which provide access to named singleton instances of the Enum's values. Every Enum value has an associated String name and an ordinal...
public static UsageUnit fromString(String value) Parses a serialized value to a UsageUnit instance. Parameters value java.lang.String the serialized value to parse. Returns UsageUnit the parsed UsageUnit object, or null if unable to parse. ...