Java Enum and Interface As we have learned, we cannot inherit enum classes in Java. However, enum classes can implement interfaces. Example: enum implementing interface interface Pizza { public void displaySize(); } enum Size implements Pizza { SMALL, MEDIUM, LARGE, EXTRALARGE; public void disp...
often representing a fixed number of options or choices. One powerful feature of Java enums is their ability to implement interfaces. This allows enums to enforce a contract defined by an interface, ensuring consistent behavior across different...
这种方法的缺点是代码量较大,且每个enum常量都需要实现接口的所有方法。 方法二:使用接口作为枚举常量 另一种方法是将接口作为enum常量的一部分: publicinterfaceAnimal{voidmakeSound();}publicenumMyAnimalimplementsAnimal{DOG(()->System.out.println("Woof")),CAT(()->System.out.println("Meow"));privatefina...
enum Season implements Rain{ SPRING("first season"){ public void rain(){ // implement interface method System.out.println("first season is raining."); } }, SUMMER("second season"){ public void rain(){ // implement interface method System.out.println("second season is raining."); } },...
DatatypeConverterInterface DatatypeFactory Date Date DateFormat DateFormat.Field DateFormatProvider DateFormatSymbols DateFormatSymbolsProvider DateFormatter DateTimeAtCompleted DateTimeAtCreation DateTimeAtProcessing DateTimeSyntax DebugGraphics DecimalFormat DecimalFormatSymbols DecimalFormatSymbo...
java enum 一、参考 Java Enums 二、enum 2.1 定义 constants: unchangeable variables, like final variables An enum is a special "class" that represents a group of constants 2.2 创建 To create an enum, (1) use the enum keyword (instead of class or interface),...
enum Season implements Rain { SPRING("first season") , SUMMER("second season") { public void rain() { // implement interface method System.out.println("heavy rain."); } }, AUTUMN("third season"), WINTER("last season"); private String describe; Season(String describe) { this.describe ...
BImplementService.getServiceName 当框架不支持多实现,但是又需要面向接口编程,需要Inject接口,则有另一种方式 代码语言:javascript 代码运行次数:0 运行 AI代码解释 publicinterfaceInterfaceService{voidget();}publicinterfaceInterfaceServiceAextendsInterfaceService{}publicclassAImplementServiceimplementsInterfaceServiceA{pub...
18.1 基本enum特性 创建enum时,编译器会为你生成一个相关类,这个类继承自java.lang.Enum。下面演示一些基本功能。 importstaticnet.mindview.util.Print.*;enumShrubbery{ GROUND, CRAWLING, HANGING }publicclassEnumClass{publicstaticvoidmain(String[] args){for(Shrubbery s : Shrubbery.values()) { ...
7. Implement Design Patterns Using Enums 7.1. Singleton Pattern Normally, implementing a class using the Singleton pattern is quite non-trivial. Enums provide a quick and easy way of implementing singletons. In addition, since the enum class implements theSerializableinterface under the hood, the...