Can I peek on a BufferedReader?

Question

Is there a way to check if in BufferedReader object is something to read? Something like C++ cin.peek(). Thanks.

Answer 1

You can use a PushbackReader. Using that you can read a character, then unread it. This essentially allows you to push it back.

PushbackReader pr = new PushbackReader(reader); char c = (char)pr.read(); // do something to look at c pr.unread((int)c); //pushes the character back into the buffer 

Answer 2

You can try the "boolean ready()" method. From the Java 6 API doc: "A buffered character stream is ready if the buffer is not empty, or if the underlying character stream is ready."

BufferedReader r = new BufferedReader(reader); if(r.ready()) {    r.read(); }