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...
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...
Java String Pool isthe special memory region whereStringsare stored by the JVM. SinceStringsare immutable in Java, the JVM optimizes the amount of memory allocated for them by storing only one copy of each literalStringin the pool. This process is called interning: String s1 = "Hello World"...
filter(sort(map(heap.objects("java.lang.String"),function(heapString){if(!counts[heapString.toString()]){counts[heapString.toString()]=1;}else{counts[heapString.toString()]=counts[heapString.toString()]+1;}return{string:heapString.toString(),count:counts[heapString.toString()]};}),'lhs.c...
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 could cause security problem in Reflection too, as the parameters are strings...
they * are created. String buffers support mutable strings. * Because String objects are ...
The advantage of immutability comes with concurrency. It is difficult to maintain correctness in mutable objects, as multiple threads could be trying to change the state of the same object, leading to some threads seeing a different state of the same object, depending on the timing of the reads...
* 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...
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 str...
StringBufferandStringBuilderare mutable classes.StringBufferoperations are thread-safe and synchronized, whileStringBuilderoperations are not thread-safe. You should useStringBufferin a multi-threaded environment and useStringBuilderin a single-threaded environment.StringBuilderperformance is faster thanStringBuffer...