Java：使用长偏移量和长度参数调用InputStream.read

Question

When calling the read method on an InputStream object, with the off and len arguments being long s, it apparently can't do it:

The method read(byte[], int, int) in the type InputStream is not applicable for the arguments (byte[], long, long)

Do I really have to read it in blocks then? Is there some easy fix? Why can't they just have an overload?

Answer 1

As stated in the Java Language Specification

Arrays must be indexed by int values; short , byte , or char values may also be used as index values because they are subjected to unary numeric promotion (§5.6.1) and become int values.

Providing a byte[] and a long len would simply not make sense. No such API exists.