这段代码看起来是正确的,但当我们尝试编译时,可能会遇到错误,比如“enum constants must implement abstract methods of the interface”。 原因分析 Java的enum类型在设计时,并没有考虑实现接口的需要。因此,当我们尝试让enum实现接口时,编译器会报错。这是因为Java的enum类型在内部使用了单例模式,每个枚举常量都是一...
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...
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...
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."); } }, AUTUMN("third season"){ public void rain(){ // ...
Enum to implement an interface You can also implement an interface in an enum. interfaceNamed{publicStringname();publicintorder(); }enumPlanets implements Named { Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune;// name() is implemented automagically.publicintorder(){returnordinal...
Enum to implement an interface You can also implement an interface in an enum. interfaceNamed{publicStringname();publicintorder(); }enumPlanets implements Named { Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune;// name() is implemented automagically.publicintorder(){returnordinal...
describe = describe; } public String toString() { return describe; } public void rain() { // implement interface method System.out.println("patter raining."); } } 被划分为同一类的枚举类型中,若某个实例在某些细节方面与其他实例较为不同,则可以单独对其进行实现。 引用: Java Enums Tutorial A...
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),...
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Theenumtype in Java can implement interfaces.While this approach is not as generic as theEnumAPI, interfaces do help us generalize. Let’s consider this interface: publicinterfaceLabeled{ Stringlabel(); } For consistency with theEnum.name()method, ourlabel()method does not have agetprefix. ...