insert into tbl_setenum(setc,enumc)value(1,2); root@localhost: 00:33 [7308][db_hlf]>insert into tbl_setenum(setc,enumc)value(1,2); Query OK, 1 row affected, 1 warning (0.01 sec) root@localhost: 00:34 [7308][db_hlf]>select * from tbl_setenum; +---+---+---+ | id ...
4);// 成员变量privateString name;privateint index;// 构造方法privateColor(String name,int index){this.name=name;this.index=index;}// 普通方法publicstaticStringgetName(int index){for(Color c:Color.values()){if(c.getIndex()==index){returnc.name;}}returnnull;}// get set 方法publicString...
1、EnumSet EnumSet 是一种专门为枚举类型所设计的 Set 类型。 与HashSet相比,由于使用了内部位向量表示,因此它是特定 Enum 常量集的非常有效且紧凑的表示形式。 EnumSet 是抽象类,其有两个实现:RegularEnumSet 、JumboEnumSet,选择哪一个取决于实例化时枚举中...
整型一共有五种:TINYINT、SMALLINT、MEDIUMINT、INT、BIGINT,其中TINYINT属于整型类型中最小的,存储的值必须为整型的数值,否则会被默认转换或报错(注:取决于MySQL运行时设置的SQL_MODE值要求)。 接下来要讲数据类型测试,今天先讲“布尔类型BOOL/BOOLEAN 与 微整型TINYINT”,枚举类型ENUM和“集合类型 SET”的测试内...
}// 普通方法publicstaticStringgetName(int index){for(Color c:Color.values()){if(c.getIndex()==index){returnc.name;}}returnnull;}// get set 方法publicStringgetName(){returnname;}publicvoidsetName(String name){this.name=name;}publicintgetIndex(){returnindex;}publicvoidsetIndex(int index...
publicstringmessage{get;privateset;} publicError(intcode,stringmessage) { this.code=code; this.message=message; } } 这也是C#的enum鸡肋的地方。当然这并不是枚举了,只不过到达了相似效果。 接着我们来看Java的enum,就会发现它比较好一些了。还拿上面这个例子来说,比如: ...
()' Declare the non-exclusive enumeration object and' set it to multiple values.DimpermAsFilePermissions perm = FilePermissions.ReadOrFilePermissions.Update' Show the values in the enumeration object.Console.WriteLine(perm.ToString)' Output: Read, Update' Show the total integer value of all values...
The enum statement allows you to create a strongly typed set of labels. You can use that enumeration in the code without having to parse or check for spelling errors. Enumerations are internally represented as integral value types with a starting value of zero. By default, PowerShell enumeratio...
This chapter defines the enum types in C#. Enums create a set of named constants and are represented by an underlying integral set of values.
Determines whether one or more bit fields are set in the current instance. IsDefined(Type, Object) Returns a Boolean telling whether a given integral value, or its name as a string, exists in a specified enumeration. IsDefined<TEnum>(TEnum) Returns a boolean telling whether a given inte...