EXTRA_LARGE("XL");privateStringabbreviation;Size(Stringabbreviation){this.abbreviation=abbreviation;}publicStringgetAbbreviation(){returnabbreviation;}@OverridepublicintcompareTo(Sizeother){returnthis.ordinal()-other.ordinal();}}publicclassEnumDemo{publicstaticvoidmain(String[]args){Sizesize1=Size.SMALL;Siz...
作者:静默虚空知识点 概念enum 的全称为 enumeration, 是 JDK 1.5 中引入的新特性。在Java中,被 enum 关键字修饰的类型就是枚举类型。形式如下:enum Color { RED, GREEN, BLUE }如果枚举不添加任何方法,枚举值默认为从0开始的有序数值。以 Color 枚举类型举例,它的枚举常量依次为 RED:0,GREEN:1,BLUE:2。枚...
packagecom.example.webdemo.entity;importcom.example.webdemo.enumeration.GenderEnum;importlombok.Data;@DatapublicclassUser{privateLong id;privateString name;privateInteger age;privateGenderEnum gender; } 数据库中字段 sql CREATETABLE`t_user` ( `id`bigintunsignedNOTNULLAUTO_INCREMENT, `name`varchar(255)...
packagecom.dylan.collection;importjava.util.Enumeration;importjava.util.Vector;/** * 测试枚举接口, * 可用于遍历集合类型,目前已被迭代器Iterator取代 * *@authorxusucheng *@create2017-12-25 **/publicclassEnumerationTest{publicstaticvoidmain(String[] args){Vectorv=newVector(); v.add("Jack"); v...
Stringenum="Hello World !!"; enum is a reserved keyword 1.2. Syntax to Create Enums As we know, generally we deal with four directions in daily life. Their names, angles and other properties are fixed. So, in programs, we can create an enum for them. The syntax to create anenumis ...
HashMap仅仅支持Iterator的遍历方式,HashTable支持Iterrator和Enumeration两种遍历方式 HashMap可以允许存在一个为null的key和若干个为null的value,但是HashTable中的key和value都不允许为null 11、线程的实现方式?怎么样启动线程?怎么区分线程? 线程的实现方式有三种:第一种是继承Thread类,第二种是实现Runnable接口,第三...
_enumeration接口_Vector_StringTokenizer https://www.sxt.cn/ 本教程是第二季,Java基础必备。文档资料在这儿https://www.sxt.cn/Java_jQuery_in_action/thirteen-student-development.html
public static void main(String args[]) { // Create a hash map Hashtable balance = new Hashtable(); Enumeration names; String str; double bal; balance.put("Zara", new Double(3434.34)); balance.put("Mahnaz", new Double(123.22)); ...
描述(Description) java.util.PropertyResourceBundle.getKeys()方法返回此PropertyResourceBundle及其父级的键作为Enumeration 。 声明 (Declaratio…
Returns an enumeration over the specified collection. [Android.Runtime.Register("enumeration", "(Ljava/util/Collection;)Ljava/util/Enumeration;", "")] [Java.Interop.JavaTypeParameters(new System.String[] { "T" })] public static Java.Util.IEnumeration Enumeration (System.Collections.ICollection c...