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jdk8 使用了sun.misc.FloatingDecimal ,用于优化float&double 转string,beetl的代码做个类似的优化(),采用了FloatingIOWriter。建议使用FloatingDecimal代替
private static final ThreadLocal<FloatingDecimal.BinaryToASCIIBuffer> threadLocalBinaryToASCIIBuffer = new ThreadLocal<FloatingDecimal.BinaryToASCIIBuffer>() {
protected FloatingDecimal.BinaryToASCIIBuffer initialValue() {
return new FloatingDecimal.BinaryToASCIIBuffer();
}
};