IfStringswere mutable, then by the time we execute the update, we can’t be sure that theStringwe received, even after performing security checks, would be safe.The untrustworthy caller method still has the reference and can change theStringbetween integrity checks. Thus making our query prone...
String is widely used as parameter for many java classes, e.g. network connection, opening files, etc. Were String not immutable, a connection or file would be changed and lead to serious security threat. The method thought it was connecting to one machine, but was not. Mutable strings cou...
安全4. The security aspect of having thestringclassimmutableinJavaisthat strings are usedforfile operations, memory management and network operations. If strings are allowed to be mutable, various properties could be changedinmalicious ways.4.在安全方面将String设计成不可变的原因就是String被用来进行文...
String作为Java中使用最为广泛的一个类，之所以设计为不可变，主要是出于效率与安全性方面考虑。这种设计...
通常情况下,在java中通过以下步骤实现不可变: 1、对于属性不提供设值方法 2、所有的属性定义为private final 3、类声明为final不允许继承 4、Return deep cloned objects with copied content for all mutable fields in class 注意:不用final关键字也可以实现对象不可变,使用final只是显示的声明,提示开发者和编译器...
但是假如String没有声明为final, 那么你的StringChilld就有可能是被复写为mutable的，这样就打破了成为...
Had String been mutable, a request to load "java.io.Writer" could have been changed to load "mil.vogoon.DiskErasingWriter" String会在加载class的时候需要,如果String可变,那么可能会修改加载中的类。 总之,安全性和String字符串常量池缓存是String被设计成不可变的主要原因。 参考 https://stackoverflow...
关于String 字符串,对于Java开发者而言,这无疑是一个非常熟悉的类。也正是因为经常使用,其内部代码的设计才值得被深究。所谓知其然,更得知其所以然。 举个例子,假如想要写个类去继承 String,这时 IDE 提示 String 为final类型不允许被继承。 此时最先想到的肯定是 java 中类被 final 修饰的效果,其实由这一点...
All string literals in Java programs, such as "abc", are implemented as instances of this class. Strings are constant; their values cannot be changed after they are created. String buffers support mutable strings. Because String objects are immutable they can be shared. For example: String ...
* A mutable sequence of characters. This class provides an API compatible * with {@code StringBuffer}, but with no guarantee of synchronization. * This class is designed for use as a drop-in replacement for * {@code StringBuffer} in places where the string buffer was being ...