String is an immutable class in Java. An immutable class is simply a class whose instances cannot be modified. All information in an instance is initialized when the instance is created and the information can not be modified. There are many advantag…

There are many reasons due to the string class has been made immutable in Java. These reasons in view, concurrency issues, security issues and performance issues. Here is a list of various valid reasons to go for immutable string class: String在Java中被…

This is an old yet still popular question. There are multiple reasons that String is designed to be immutable in Java. A good answer depends on good understanding of memory, synchronization, data structures, etc. In the following, I will summarize so…

The string is Immutable in Java because String objects are cached in String pool. Since cached String literals are shared between multiple clients there is always a risk, where one client's action would affect all another client. For example, if one…

question: I wrote the following code on immutable Strings. public class ImmutableStrings { public static void main(String[] args) { testmethod(); } private static void testmethod() { String a = "a"; System.out.println("a 1-->" + a);…

本文翻译自:http://www.programcreek.com/2013/04/why-string-is-immutable-in-java/ 这是一个很老但很流行的问题,这里有几个原因String在java中被设计成immutable的.对内存.同步.数据结构等有好的理解,能更好的回答这个问题.下面我将简单的介绍这些原因: 1, String Pool的需要. String pool(String intern pool) 是一个方法区里的特殊的存储区域.当创建一个String, 如果它…

相关讲解,参考: Java Reference 源码分析 Java Reference详解 Reference: // 名称说明下:Reference指代引用对象本身,Referent指代被引用对象 /** * Reference的抽象基类,这个类中定义了所有引用对象的常用操作. * 由于引用对象是通过与垃圾回收器密切合作来实现的,因此,不要直接继承此基类; * * @since 1.2 */ public abstract class Reference<T> { /* * 一个Refere…

二哥,你能给我说说为什么 String 是 immutable 类(不可变对象)吗?我想研究它,想知道为什么它就不可变了,这种强烈的愿望就像想研究浩瀚的星空一样.但无奈自身功力有限,始终觉得雾里看花终隔一层.二哥你的文章总是充满趣味性,我想一定能够说明白,我也一定能够看明白,能在接下来写一写吗? 收到读者小 R 的私信后,我就总感觉自己有一种义不容辞的责任,非要把 immutable 类说明白,否则我就怎么地--你说了算! 01.什么是不可变类 一个类的对象在通过构造方法创建后如果状态不会再被改…

@(Java)[Reference] Java Reference简要概述 Reference对象封装了其它对象的引用,可以和普通的对象一样操作. Java提供了四种不同类型的引用,引用级别从高到低分别为FinalReference,SoftReference,WeakReference,PhantomReference.其中FinalReference不向外提供.每种类型对应着不同级别的可达性. 强引用FinalReference 强引用指的是,程序中有直接可达的引用,而不需要通过任何引用对象…

springMVC action接收参数: org.springframework.validation.BindException: org.springframework.validation.BeanPropertyBindingResult: 1 errorsField error in object 'projectStep' on field 'createDate': rejected value [2016-6-23]; codes [typeMismatch.projectSt…