String广泛的作为参数被JAVA中的类使用,比如 网络连接,打开的文件等等,如果String不是immutable,一个连接或文件的改变将导致严重的安全威胁,一个方法还以为正连接到一个机器上,并其实没有。可变的String同样将导致反射的安全性问题,因为反射中的参数都是String类型的。 代码: booleanconnect(string s){if(!isSecure(...
3. string和String有什么区别? MSDN中对string的说明:stringis analiasforStringin the .NET Framework 呵呵string是String的别名而已,都是一家。 4. String为什么是Immutable,怎么实现的? immutable:对象一旦生成不可改变 关于怎么实现的,在明白了问题2之后很好办,只要不提供任何修改自己成员变量的方法就可以了。顺便...
在String类里,代码: private int hash;//this is used to cache hash code. 1. 3. 安全 String广泛的作为参数被JAVA中的类使用,比如 网络连接,打开的文件等等,如果String不是immutable,一个连接或文件的改变将导致严重的安全威胁,一个方法还以为正连接到一个机器上,并其实没有。可变的String同样将导致反射的安...
Java string is mutable or immutable? In Java, the string is immutable which means you cannot modify the states of a string object. Why string is immutable or final in Java? In Java, the string is immutable because of the following reasons: To keep the sensitive information secure. To maint...
When it comes to Strings in Java, they are immutable, signifying that the content of a String object cannot be modified once it has been instantiated. However, it is important to note that while the String object itself cannot be changed, the reference variable pointing to the String object ...
Why string is immutable? From :http://sureshk37.wordpress.com/2007/12/18/why-string-is-immutable/ String in a class it is used to holding the array of characters. The difference between String and StringBuffer is String is immutable where as StringBuffer is mutable. Means we can not ...
3. Why IsStringImmutable in Java? The key benefits of keeping this class as immutable are caching, security, synchronization, and performance. Let’s discuss how these things work. 3.1. Introduce toStringPool TheStringis the most widely used data structure. Caching theStringliterals and reusing ...
Why String is immutable in Java? 字符串在Java中是不可变的。 不可变类只是其实例不可修改的类。 实例中的所有信息在创建实例时初始化,并且无法修改这些信息。 不可变类有很多优点。 本文总结了为什么字符串被设计成不可变的。 本文从内存、同步和数据结构的角度阐述了不变性的概念。
String is immutable whereas StringBuffer and StringBuilder are mutable classes. StringBuffer is thread-safe and synchronized whereas StringBuilder is not. That’s why StringBuilder is faster than StringBuffer. String concatenation operator (+) internally uses StringBuffer or StringBuilder class. ...
一下内容来自http://www.kogonuso.com/2015/03/why-string-is-immutable-or-final-class.html#sthash.VgLU1mDY.dpuf. 发现百度的中文版本基本也是此文的翻译版。 缓存的需要 String是不可变的。因为String会被String pool缓存。因为缓存String字面量要在多个线程之间共享,一个客户端的行为会影响其他所有的客户端,...