4.Enum覆载了了toString方法,因此我们如果调用Color.Blue.toString()默认返回字符串”Blue”. 5.Enum提供了一个valueOf方法,这个方法和toString方法是相对应的。调用valueOf(“Blue”)将返回 Color.Blue.因此我们在自己重写toString方法的时候就要注意到这一点,一把来说应该相对应地重写valueOf方法。 6.Enum还提供...
public final int ordinal:取得枚举对象下标 enum Color{ RED,GREEN,BLUE; } public class Test { public static void main(String[] args) { Color color = Color.RED; System.out.println(color.ordinal()+"="+color.name()); System.out.println(color); } } 1. 2. 3. 4. 5. 6. 7. 8. 9....
publicclassEnumOrdinalExample{publicstaticvoidmain(String[]args){for(Dayday:Day.values()){System.out.println(day+" has an ordinal value of: "+day.ordinal());}}} 1. 2. 3. 4. 5. 6. 7. 这段代码将输出: SUNDAY has an ordinal value of: 0 MONDAY has an ordinal value of: 1 TUESDAY ...
java枚举类Enum方法简介(valueof,value,ordinal) 2016-08-31 13:04 −... nickTimer 0 26879 Java 基础复习 -- Enum 类 2019-12-06 14:31 −# 一、枚举类基本语法 在 Java SE5 中添加了一个看似很小的特性,即 enum 关键字,它使得我们在需要群组并使用枚举类型集时,可以很方便的处理。 所有的 enu...
System.out.println("Programming in " +Language.PHP.toString());//returns the ordinal of this enum constant,start with 0 (int)System.out.println("Programming in " +Language.C.ordinal()); System.out.println("Programming in " +Language.Java.ordinal()); ...
//1、ordinal(),枚举顺序值 System.out.println("枚举顺序值,"+Weekday.MONDAY.ordinal());//1 /* * 2、valueOf() * public static <T extends Enum<T>> T valueOf(Class<T> enumType, String name) * enumType -- 这是枚举类型,返回一个常量的类的对象。
TvalueOf(Class<T> enumType,Stringname) Returns the enum constant of the specified enum type with the specified name. Methods inherited from class java.lang.Object getClass,notify,notifyAll,wait,wait,wait Constructor Detail Enum protected Enum(Stringname, 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 ...
java.lang.Enum类提供了以下方法: int compareTo(E o)String name()int ordinal()String toString()public static <T extends Enum> T valueOf(Class enumType,String name) 3.7.2 枚举类的Field,方法 和构造函数 枚举类也可以定义Field、方法。 枚举为的实例只能是枚举值,不能随意通过new创建枚举类对象...
public static final String ERROR_CANNOT_FORMAT_LITERAL "Could not format constant value to SQL literal: " public static final String ERROR_LEGACY_ORDINAL_PARAMS_NO_LONGER_SUPPORTED "Legacy-style query parameters (`?`) are no longer supported; use JPA-style ordinal parameters (e.g., `?1`) ...