Enums are used when we know all possible values at compile time, such as choices on a menu, rounding modes, command-line flags, etc. It is not necessary that the set of constants in an enum type stayfixedfor all time. A Java enumeration is a class type. Although we don’t need nee...
System.out.println("type = "+ type +" type.name = "+ type.name() +" typeName = "+ type.getTypeName() +" ordinal = "+ type.ordinal()); } }/** *在Java代码使用枚举 */privatestaticvoiduseEnumInJava(){StringtypeName="f5";TYPEtype=TYPE.fromTypeName(typeName);if(TYPE.BALANCE.equals...
publicstatic<TextendsEnum<T>>TvalueOf(Class<T>enumType,String name){Tresult=enumType.enumConstantDirectory().get(name);if(result!=null)returnresult;if(name==null)thrownewNullPointerException("Name is null");thrownewIllegalArgumentException("No enum constant "+enumType.getCanonicalName()+"."+...
valueOf(t1 / Season, s); } // defined in the source code public static <T extends Enum<T>> T valueOf(Class<T> enumType, String name) { T result = enumType.enumConstantDirectory().get(name); if (result != null) return result; if (name == null) throw new NullPointerException(...
staticEnumType[]values() Returns an array containing the constants of this enum type, in the order they are declared. Methods inherited from class java.lang.Enum clone,compareTo,equals,finalize,getDeclaringClass,hashCode,name,ordinal,toString,valueOf ...
for (EnumType c : EnumType.values()) System.out.println(c); Returns: an array containing the constants of this enum type, in the order they are declared valueOf public staticEnumTypevalueOf(java.lang.String name) Returns the enum constant of this type with the specified name. The string...
*在Java代码使用枚举 */ private static void useEnumInJava() { String typeName = "f5"; TYPE type = TYPE.fromTypeName(typeName); if (TYPE.BALANCE.equals(type)) { System.out.println("根据字符串获得的枚举类型实例跟枚举常量一致"); } else { ...
packagecom.lxk.enumTest;/*** Java枚举用法测试* * Created by lxk on 2016/12/15*/publicclassEnumTest{publicstaticvoidmain(String[]args){forEnum();useEnumInJava();}/*** 循环枚举,输出ordinal属性;若枚举有内部属性,则也输出。(说的就是我定义的TYPE类型的枚举的typeName属性)*/privatestaticvoidfor...
int型输入语句 java java int enum Java 用enum代替int常量 用enum代替int常量 1、用enum构建 2、enum枚举常量与数据关联 3、枚举常量与行为关联 4、枚举策略模式 5、总结 参考 用enum代替int常量 在枚举类型出现之前,一般都常常使用int常量或者String常量表示列举相关事物。如:...
// Instantiate by passing in the required parameters.// You’ll get something that is of the super type - this is to help Java’s// not-always-great type inference do the right thing in many common cases.MyMessagesmessage=MyMessages.login("petter","s3cr3t");// If you actually needed...