DataEnum DataEnum allows you to work withalgebraic data typesin Java. You can think of it as an enum where every individual value can have different data associated with it. What problem does it solve? The idea of algebraic data types is not new and already exists in many other programming...
而枚举则不同,在序列化的时候Java仅仅是将枚举对象的name属性输出到结果中,反序列化的时候则是通过Enum的valueOf()方法来根据名字查找枚举对象。同时,编译器是不允许任何对这种序列化进行定制,因此禁用了writeObject、readObject、readObjectNoData、writeReplace和readResolve等方法。 代码语言:javascript 代码运行次数:0 运...
实例(也叫对象)有限且固定不变的类,在Java里被称为枚举类。 例如,季节类,它只有4个实例(春、夏、秋、冬),并且这4个实例不会改变。可以用枚举类来表示: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 public enum SeasonEnum{ SPRING,SUMMER,FALL,WINTER; } 枚举类是一种特殊的类,它一样可以有自己...
java.lang.Object.getClass java.lang.Object.notify java.lang.Object.notifyAll java.lang.Object.wait java.lang.Object.wait java.lang.Object.wait Methods valueOf(String name) public static DataType valueOf(String name) Parameters name java.lang.String Returns DataType ...
Methods inherited from class java.lang.Object getClass,notify,notifyAll,wait,wait,wait Constructor Detail Enum protected Enum(Stringname, int ordinal) Sole constructor. Programmers cannot invoke this constructor. It is for use by code emitted by the compiler in response to enum type declarations. ...
idea error:(79, 13) java: 找不到符号 符号: 变量 log 位置: 类 run.halo.app.model.enums.datatype;idea导入项目报错 第一步: IDEA在编译的时候报Error:(30, 17) java: 找不到符号符号: 变量 log Error:(30, 17) java: 找不到符号 符号: 变量 log...
SeeJava Language Changesfor a summary of updated language features in Java SE 9 and subsequent releases. SeeJDK Release Notesfor information about new features, enhancements, and removed or deprecated options for all JDK releases. Anenum typeis a special data type that enables for a variable to...
java.lang.Object java.lang.Enum<DataType> com.microsoft.azure.cosmosdb.DataType public enum DataType Data types in the Azure Cosmos DB database service. Fields LineString Represents a line string data type. MultiPolygon Represent a multi-polygon data type. ...
import lombok.Data; import org.apache.ibatis.type.JdbcType; import java.io.Serializable; import java.time.LocalDateTime; @TableName(value = "template") @Data @ApiModel(value = "Template对象", description = "模板表") public class Template implements Serializable { ...
import java.time.LocalDateTime; import com.baomidou.mybatisplus.annotation.FieldFill; import com.baomidou.mybatisplus.annotation.IdType; import com.baomidou.mybatisplus.annotation.TableField; import com.baomidou.mybatisplus.annotation.TableId; import com.baomidou.mybatisplus.annotation.TableName; import...