> ordinal():返回枚举值(即实例)在枚举类中的索引值(即声明时的位置),第一个枚举值的索引值为 0。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 System.out.println(SeasonEnum.SPRING.ordinal()); // 0 System.out.println(SeasonEnum.SUMMER.ordinal()); // 1 System.out.println(SeasonEnum.FAL...
mybatis 默认使用转换器EnumTypeHandler 进行转换,类型为字符串。 解决方法: 修改mybatis xml文件,将 resultType 修改为 resultMap配置,根据字段需要指定转换类为EnumOrdinalTypeHandler (前提条件为 enum 中下标key必须从0开始,且数据库与之对应,否则则会出现数组越界错误 由此可见,此类型处理器适用性不广,建议自己重写...
ConstantPool是一个抽象类,如果我们需要新建一个枚举类池,可以直接继承ConstantPool,然后实现其中的newConstant方法。下面是一个使用的具体例子: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 public final class Foo extends AbstractConstant<Foo> { Foo(int id, String name) { super(id, name); } } ...
即我们上面用到的枚举常量名称(name)和枚举常量位置(ordinal) 贴上这两个属性的源码: /** * Returns the name of this enum constant, exactly as declared in its enum declaration. */ public final val name: String /** * Returns the ordinal of this enumeration constant (its position in its enum...
Java中Enum方法toString与ordinal方法 Java中Enum方法toString与ordinal方法 publicenumLanguage { C, Java, PHP; }publicclassEnumDemo {publicstaticvoidmain(String args[]) {//returns the name of this enum constant(String)System.out.println("Programming in " +Language.C.toString());...
枚举类型符合通用模式 Class Enum>,而 E 表示枚举类型的名称。枚举类型的每一个值都将映射到 protected Enum(String name, int ordinal) 构造函数中,在这里,每个值的名称都被转换成一个字符串,并且序数设置表示了此设置被创建的顺序。 上面那段代码声明的enum对象实际上调用了7次Enum(String name, int ordinal) ...
Returns the ordinal of this enumeration constant (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 java.util.EnumSet ...
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. Parameters: name- - The name of this enum constant, which is the identifier used to declare it. ...
int ordinal() 返回枚举常量的序数(它在枚举声明中的位置,其中初始常量序数为零) static <T extends Enum> T valueOf(Class enumType, String name) 返回带指定名称的指定枚举类型的枚举常量 values()此方法虽然在JDK文档中查不到,但是每个枚举类都具有该方法,它用于遍历枚举的所有枚举值 ...
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf Methods inherited from class java.lang.Object getClass, notify, notifyAll, wait, wait, wait Enum Constant Detail QMapLanguage_zh public static finalQMapLanguageQMapLanguage_zh ...