3
private final static ThreadLocal<char[]> charsLocal = new ThreadLocal<char[]>();
private static char[] allocateChars(int length) {
char[] chars = charsLocal.get();
if (chars == null) {
if (length <= 1024 * 64) {
chars = new char[1024 * 64];
charsLocal.set(chars);
} else {
chars = new char[length];
}
} else if (chars.length < length) {
chars = new char[length];
}
return chars;
}直接使用65536个字符是不是太浪费了？大部分场景下都是小对象，但是65536直接内存常驻，利用率非常低，内存水位直接被ThreadLocal拉高，无法GC掉。大对象用不到，小对象还浪费……
