问题描述
我一直想知道java
中String / StringBuilder / StringBuffer的charAt函数的实现是什么？它的复杂性是什么？
还有什么关于StringBuffer / StringBuilder中的deleteCharAt（）？
I've been wondering about the implementation of charAt function for String/StringBuilder/StringBuffer in javawhat is the coomplexity of that ?also what about the deleteCharAt() in StringBuffer/StringBuilder ?
推荐答案
对于 String ， StringBuffer ， StringBuilder ， charAt（）是一个固定时间操作。
For String, StringBuffer, and StringBuilder, charAt() is a constant-time operation.
对于 StringBuffer 和 StringBuilder ， deleteCharAt（）是线性时间操作。
For StringBuffer and StringBuilder, deleteCharAt() is a linear-time operation.
StringBuffer 和 StringBuilder 具有非常相似的性能特征。主要区别在于前者是 synchronized （因此是线程安全的），而后者则不是。
StringBuffer and StringBuilder have very similar performance characteristics. The primary difference is that the former is synchronized (so is thread-safe) while the latter is not.
这篇关于Java CharAt（）和deleteCharAt（）性能的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！