其次,MyFirstEnum居然继承了一个类,java.lang.Enum,o my god,以前完全没听说过这个类啊,让我们看下这个类里有什么东西。 /*** The name of this enum constant, as declared in the enum declaration.* Most programmers should use the {@link #toString} method rather than* accessing this field.*/priv...
生效范围 Application inJava:declaration Edit variables 注解生命周期 RetentionPolicy.SOURCE 源码注解,编译成.class文件后注解就不存在,用来提示开发者 RetentionPolicy.CLASS CLASS汇编注解,编译成.class文件后注解也还存在,用于自动生成代码 RetentionPolicy.RUNTIME 运行时动态注解,生命周期一直程序运行时都存在,常用于自动...
生效范围 Application inJava:declaration Edit variables 6. 注解生命周期 RetentionPolicy.SOURCE 源码注解,编译成.class文件后注解就不存在,用来提示开发者 RetentionPolicy.CLASS CLASS汇编注解,编译成.class文件后注解也还存在,用于自动生成代码 RetentionPolicy.RUNTIME 运行时动态注解,生命周期一直程序运行...
publicabstractclassEnum<EextendsEnum<E>>implementsComparable<E>, Serializable {/*** The name of this enum constant, as declared in the enum declaration. * Most programmers should use the {@link#toString} method rather than * accessing this field.*/privatefinalString name; ... } enum 定义的...
If you define the enum class as public, Declaration should be in a separate java file. It is one of the ways to define an enum in java. publicenumMonths{JAN(1),FEB(2),MAR(3),APRIL(4),MAY(5),JUN(6),JUL(7),AUG(8),SEP(9),OCT(10),NOV(11),DEC(12);} ...
Basics of Enum Declaration and Interface Implementation To begin with, lets revisit how enums are declared in Java. Enum constants are typically declared at the beginning of an enum class, each representing a unique value within the enum set. Here’s a simple example of an enum `Color` that...
(its position * in its enum declaration, where the initial constant is assigned * an ordinal of zero). * * Most programmers will have no use for this method. It is * designed for use by sophisticated enum-based data structures, such * as {@link java.util.EnumSet} and {@link java....
Declaration of enum in Java:Enum declaration can be done outside a Class or inside a Class but not inside a Method. Java // A simple enum example where enum is declared // outside any class (Note enum keyword instead of // class keyword) ...
2.1 Java Bean 代码 一般在我设计枚举字段的时候,我会先设计 Java 部分的枚举字段,因为嘛,我觉得这样粘贴复制方便一点: public enum OrderStatus { CREATE("创建"), PAYING("支付中"), IN_PROGRESS("支付成功"), FAILED("支付失败"), REVERSED("取消订单"); ...
String name() : Returns the name of this enum constant, exactly as declared in its enum declaration. 返回枚举常量声明时的字符串。 int ordinal() : 返回枚举常量的声明时的顺序位置,像数组的索引一样,从0开始。 valueOf(Class<T> enumType, String name) : 其实是从 枚举常量的字符串到 枚举常量的...