Logically,each enum is an instance ofenumtypeitself. So given enum can be seen as the below declaration.JVM internally adds ordinal and value methodsto this class which we can call while working with anenum. finalclassDirectionextendsEnum<Direction>{publicfinalstaticDirectionEAST=newDirection();publ...
}// 获取所有public方法Method[] methods = enumClass.getMethods(); List<Field> fieldList =newArrayList<>();//1.通过get方法提取字段,避免get作为自定义方法的开头,建议使用 ‘find’或其余命名Arrays.stream(methods) .map(Method::getName) .filter( methodName -> methodName.startsWith("get") && !"...
Here, `Color.RED` is assigned to a variable of type `Printable`, demonstrating how enums can be used polymorphically with interfaces. This flexibility allows enums to be seamlessly integrated into systems requiring consistent behavior across different enum constants. Additional Interface Methods and E...
< E extends Enum<E>>可以知道他的子类有泛型上限,只能是Enum或者Enum的子类。 2.相关函数 构造函数 protected Enum(String name, int ordinal) //Sole constructor.唯一的构造函数 1. 2. 说明了Enum类还有两个数据成员name和ordinal name和ordinal函数 String name() //Returns the name of this enum constant...
Enum Class in Java In Java, enum types are considered to be a special type of class. It was introduced with the release of Java 5. An enum class can include methods and fields just like regular classes. enum Size { constant1, constant2, …, constantN; // methods and fields } When ...
} // 获取所有public方法 Method[] methods = enumClass.getMethods(); List<Field> fieldList = new ArrayList<>(); //1.通过get方法提取字段,避免get作为自定义方法的开头,建议使用 ‘find’或其余命名 Arrays.stream(methods) .map(Method::getName) .filter( methodName -> methodName.startsWith("get...
(1) An enum can, just like a class, have attributes and methods. (2) The only difference is that enum constants are public, static and final (unchangeable - cannot be overridden). (3) An enum cannot be used to create objects, and it cannot extend other classes (but it can implement...
Enum是所有 Java 语言枚举类型的公共基本类(注意Enum是抽象类),以下是它的常见方法: 二、枚举的实现 1)枚举类编译后会生成一个抽象类,继承java.long.Enum 2) 而枚举中定义的枚举常量,变成了相应的 public static final 属性,而且其类型就抽象类的类型,名字就是枚举常量的名字 ...
A method must be declared within a class. It is defined with the name of the method, followed by parentheses(). Java provides some pre-defined methods, such asSystem.out.println(), but you can also create your own methods to perform certain actions: ...
In this guide to Java enum with string values, learn to create enum using strings, iterate over all enum values, get enum value and reverse lookup.