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public enum State { ACTIVE, NOT_ACTIVE; } public class CurrentState { private State state; public State getState() { return state; } public void setState(State state) { this.state = state; } } public class SomeObject { private CurrentState state; public SomeObject(CurrentState state) { ...
JAVA编程时显示错误需要class,interface或enum怎么解决 import java.util.*;public class Test {public static void main(String[] args) {Scanner in = new Scanner(***.in);System.out.println("请输入你心中的数字:");int sex = in.nextI... java教程学习 java教程学习 学习-就业-提升,一站式it培训 j...
import java.util.EnumMap; enum Weekday { MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY } public class EnumMapExample { public static void main(String[] args) { EnumMap map = new EnumMap<>(Weekday.class); map.put(Weekday.MONDAY, "星期一"); map.put(Weekday.TUESDAY, ...
This is the common base class of all Java language enumeration classes. More information about enums, including descriptions of the implicitly declared methods synthesized by the compiler, can be found in section { Added in 1.5. Java documentation forjava.lang.Enum. ...
Java中单例模式是一种广泛使用的设计模式,单例模式有很多好处,它能够避免实例对象的重复创建,不仅可以减少每次创建对象的时间开销,还可以节约内存空间(比如spring管理的无状态bean);还能够避免由于操作多个实例导致的逻辑错误。如果一个对象有可能贯穿整个应用程序,而且起到了全局统一管理控制的作用,那么单例模式也许是一...
public class EnumTest { public static void main(String[] args) { forEnum(); useEnumInJava(); } /** * 循环枚举,输出ordinal属性;若枚举有内部属性,则也输出。(说的就是我定义的TYPE类型的枚举的typeName属性) */ private static void forEnum() { ...
* Java枚举用法测试 * * Created by lxk on 2016/12/15 */ public class EnumTest { public static void main(String[] args) { forEnum(); useEnumInJava(); } /** * 循环枚举,输出ordinal属性;若枚举有内部属性,则也输出。(说的就是我定义的TYPE类型的枚举的typeName属性) */ ...
Enum类是java.lang包中一个类,他是Java语言中所有枚举类型的公共基类。 一、定义 publicabstractclassEnum<EextendsEnum<E>>implementsComparable<E>,Serializable 1.抽象类。 首先,抽象类不能被实例化,所以我们在java程序中不能使用new关键字来声明一个Enum,如果想要定义可以使用这样的语法: ...
I think I'm just trying to wrap my head around what the best way to do this sort of thing is in Java, or if I need to write a bunch of if-statements to deal with the individual Drink.values(). Any help? java enums nested-class Share Follow asked Sep 4, 2011 at 0:59 Chri...