BufferedWriter(Writer out, int sz) 8192B / 8K
StringBuffer 16字节 线程安全
StringBuilder 16字节
ArrayList 10 1.5倍
HashMap 16 0.75
BufferedWriter(Writer out, int sz) 8192B / 8K
StringBuffer 16字节 线程安全
StringBuilder 16字节
ArrayList 10 1.5倍
HashMap 16 0.75