反编译查看底层运行情况
string拼接的时候底层也是new的stringbuilder频繁创建对象所以不快
stringbuffer直接通过append追加所以快
类加载
类加载双亲委派机制
数据运行区域
serial串行垃圾回收器
parallel并行垃圾回收期
CMS和parnew并行并发垃圾回收器
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JVM
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- 原文地址：https://www.cnblogs.com/shan13936/p/16508315.html