从文件（java）读取ascii特征和整数

Question

I'm doing a project where I my code has to be the most efficient possible, and I need to read ascii chars and ints from a file. The problem (I think) is that when I read chars it reads in UTF8 beacuse it only reads half the times it should.

I tried with DataInputStream but it doesnt work. Also I check the RandomAccessFile but it reads in UTF8. The Scanner throws an InputMismatchException when I tried to read two bytes and convert them to char.

Is it that the only option is to do this by hand?

Thanks in advance

Answer 1

Read one byte at once. It will be the value you want. For example, with RandomAccessFile read() method:

read() Reads a byte of data from this file. The byte is returned as an integer in the range 0 to 255 (0x00-0x0ff). This method blocks if no input is yet available.

Example:

int asciiValue randomAccessFile.read();

Then you can cast ìnt to char

char character = (char) asciiValue;

Answer 2

I found out what the problem is. The thing is that when you write chars and ints using BufferedWriter, it converts all to char, which makes it impossible to read ints as a type directly from file. I'll try writing with a DataOutputStream, using the methods to direclty write ints and chars.