String,StringBuilder,StringBuffer
date
Mar 28, 2019
slug
String,StringBuilder,StringBuffer
status
Published
tags
Java
summary
type
Post
String,StringBuilder,StringBuffer
- String是不可变类，StringBuilder、StringBuffer是可变类
- StringBuilder、StringBuffer都继承自AbstractStringBuilder，StringBuffer线程安全
AbstractStringBuilder
- MAX_ARRAY_SIZE=Integer.MAX_VALUE-8
StringBuffer
- since jdk 1.0
- StringBuffer是如何保证线程安全的？在所有方法在加上了synchronized实现线程安全
StringBuilder
- since jdk 1.5
StringBuilder、StringBuffer
- 初始capacity是16
- ensureCapacity(int minimumCapacity) 规则