importorg.example.onjava.onjavaUtils.Enums; importjava.util.Iterator; /** *@AuthorCoder_Pans *@Date2022/11/20 09:32 *@PackageName:org.example.onjava.senior.example01enum.desgin *@ClassName: Mail *@Description: TODO 邮件建模 *@Version1.0 */ publicclassMail{ enumGeneralDelivery{YES,NO1,NO...
将无法被继承)而且该类继承自java.lang.Enum类,该类是一个抽象类(稍后我们会分析该类中的主要方法),除此之外,编译器还帮助我们生成了7个Day类型的实例对象分别对应枚举中定义的7个日期,这也充分说明了我们前面使用关键字enum定义的Day类型中的每种日期枚举常量也是实实在在的Day实例对象,只不过代表的内容不一样...
可以看到getOrCreate就是向constants Map中创建和获取新创建的constant对象。 使用ConstantPool 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 ex...
Note that when using an enumeration type as the type of a set or as the type of the keys in a map, specialized and efficient set and map implementations are available. See Java Language Specification: 8.9 Enum Classes8.9.3 Enum Members Since: 1.5 See Also: Class.getEnumConstants() EnumSet...
>[] enums = (Enum[]) enumClass.getEnumConstants(); for (Enum<?> anEnum : enums) { Map<String, Object> map = new HashMap<>(fieldList.size()); for (Field field : fieldList) { field.setAccessible(true); try { // 向map集合添加字段名称 和 字段值 map.put(field.getName(), ...
Returns the Class object corresponding to this enum constant's enum type. Two enum constants e1 and e2 are of the same enum type if and only if e1.getDeclaringClass() == e2.getDeclaringClass(). (The value returned by this method may differ from the one returned by theObject#getClassmethod...
BeforeJDK1.5, a common way to represent enumerations was with integer constants, like this: class Bread { static final int wholewheat = 0; static final int ninegrain = 1; static final int rye = 2; static final int french = 3;
[Android.Runtime.Register("getEnumConstants", "()[Ljava/lang/Object;", "")] public Java.Lang.Object[]? GetEnumConstants(); Returns Object[] an array containing the values comprising the enum class represented by this Class object in the order they're declared, or null if this Class ob...
// e.values(); // No values() in Enum for (Enum en : e.getClass().getEnumConstants()) System.out.println(en); } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 实现而非继承 所有的 enum 都继承自Java.lang.Enum类。由于 Java 不支持多重继承,所以你的 enum 不能再继承...
Enum maps are maintained in thenatural orderof their keys (the order in which the enum constants are declared). This is reflected in the iterators returned by the collections views (keySet(),entrySet(), andvalues()). Iterators returned by the collection views areweakly consistent: they will ...