Enumeration (enum) was not originally available in Java though it was available in other language like C and C++ but eventually Java realized and added to version 5 of Java were the safe type enumerations (Type Safe Enums), which allows you to create enu
AI代码解释 privatevoidwriteObject0(Object obj,boolean unshared)throws IOException{...//String类型 if (obj instanceof String) { writeString((String) obj, unshared); //数组类型 } else if (cl.isArray()) { writeArray(obj, desc, unshared); //枚举类型 } else if (obj instanceof Enum) { ...
一、枚举类型的定义 enum 类型名 {枚举值表}; 类型名是变量名,指定枚举类型的名称。 枚举值表也叫枚举元素列表,列出定义的枚举类型的所有可用值,各个值之间用“,”分开。 例: enum Suit { Diamonds, Hearts, Clubs, Spades }; 二、枚举变量说明 枚举变量有多种声明方式: 1.枚举类型定义与变量声明分开 如:...
1packagecom.ljq.test;23/**4* 枚举用法详解5*6*@authorjiqinlin7*8*/9publicclassTestEnum {10/**11* 普通枚举12*13*@authorjiqinlin14*15*/16publicenumColorEnum {17red, green, yellow, blue;18}1920/**21* 枚举像普通的类一样可以添加属性和方法,可以为它添加静态和非静态的属性或方法22*23*@a...
Enum 类型的介绍 枚举类型(Enumerated Type) 很早就出现在编程语言中,它被用来将一组类似的值包含到一种类型当中。而这种枚举类型的名称则会被定义成独一无二的类型描述符,在这一点上和常量的定义相似。不过相比较常量类型,枚举类型可以为申明的变量提供更大的取值范围。
I guess the latter scenario is what you're getting confused by? In other words, we effectively only pass in an actual exception there when no HandlerExceptionResolver was available to handle it, that is, when it eventually gets propagated to the servlet container... I see that this is deba...
We shoulduse an enum when we know all possible values of a variable at compile time or design time, though we can add more values in the future as and when we identify them. In this java enum tutorial, we will learn what enums are and what problems they solve. ...
对于Java的序列化,一直只知道只需要实现Serializbale这个接口就可以了,具体内部实现一直不是很了解,正好这次在重复造RPC的轮子的时候涉及到序列化问题,就抽时间看了下 Java序列化的底层实现,这篇文章算是这次的学习小结吧。 第一部分:What Java序列化是指把Java对象保存为二进制字节码的过程,Java反序列化是指把二进...
A Java enumeration is a class type. Although we don’t need need to instantiate an enum using new, it has the same capabilities as other classes. This fact makes Java enumeration a very powerful tool. Just like classes, you can give them constructor, add instance variables and methods, and...
A quick and practical guide to the use of the Java Enum implementation, what it is, what problems it solves and how it can be used to implement commonly used design patterns.