Java Input Read...

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Learning poster
Posts: 69
Joined: Tue Jan 30, 2007 12:51 am

Java Input Read...

Post by x140l31 »


I'm a newby in Java, I need some help for the inputs like...

".. a line with two integers 0 0 indicate the end of data."

two integers... or a string...

How can I read for this problems?

I try this:

Code: Select all

InputStreamReader isr = new InputStreamReader(;
BufferedReader br = new BufferedReader(isr);

String mole1;
while ((mole1 = br.readLine()) != null && mole1 != "Q")
but it doesn't works :(


Posts: 1244
Joined: Mon Feb 28, 2005 4:51 am
Location: Zürich, Switzerland

Re: Java Input Read...

Post by mf »

Operators == and != compare objects' addresses.
Two strings coming from different places (such as string from readLine method, and hard-coded "Q" in your class) are never going to be equal according to the == operator, because they're represented by different objects, even if their contents are the same.

You should use String.equals() method to compare strings instead.

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