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...
在这个例子中,我们定义了一个方法getEnumInterface(),它返回了MyInterface类型的枚举值MyEnum.VALUE1。 完整代码 下面是完整的示例代码: publicenumMyEnumimplementsMyInterface{VALUE1,VALUE2,VALUE3;@OverridepublicStringgetValue(){returnthis.name();}}publicinterfaceMyInterface{StringgetValue();}publicclassMain{...
interface Info { void describe(); } 1. 2. 3. 4. 5. 6. 创建一个枚举类实现该接口 /** * 枚举类实现接口 */ public enum EnumImplement implements Info{ } 1. 2. 3. 4. 重写接口的方法 /** * 枚举类实现接口重写抽象方法 */ public enum EnumImplement implements Info{ /** * 需求:实现...
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), (2) separate the constants with a comma. (3) Note that they should be in uppercase letters 2.3 获取 You can access enum constants...
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()) { ...
Worse, it represents a commitment: if in a future release the class is modified so that it no longer needs to use the constants, it still must implement the interface to ensure binary compatibility. If a nonfinal class implements a constant interface, all of its subclasses will have their ...
接口interface 只能包含抽象方法 abstract method。 由于接口最终要被其他类实现 implement,因此通常使用 public 修饰,禁止使用 final 修饰。 比较 类型抽象方法实例化 具体类 concrete class 禁止包含抽象方法 no abstract method 允许can instantiate 抽象类 abstract class 至少包含一个方法 at least one abstract method...
Implementing the Relatable Interface Here is theRectangleclass that was presented in theCreating Objectssection, rewritten to implementRelatable. public class RectanglePlus implements Relatable { public int width = 0; public int height = 0; public Point origin; ...
一:在枚举类中通过implement关键字实现接口 二:通过匿名内部类直接在枚举类中的元素中使用匿名内部类重写方法 代码实现: public enum EnumTest implements Enum_Interface_Test{ //第一种实现方式。直接实现并重写枚举类的方法 @Override public void shwo() { System.out.println("实现了接口"); } //第二种实现...
This class provides a skeletal implementation of the Map interface, to minimize the effort required to implement this interface. AbstractMap.SimpleEntry An Entry maintaining a key and a value. AbstractMap.SimpleImmutableEntry An unmodifiable Entry maintaining a key and a value. AbstractQueue This ...