How to Stop an infinite loop

Question

I'm reading from the keyboard. I take the input and use it as a while statement's condition. However, I can't break out of the loop once i'm in it. I've tried everything, but nothing works. The loop should terminate after null is returned, but it doesn't. Here is my code:
inputline = keyboard.readLine();//read the keyboard
while( inputline = keyboard.readLine() )!= null){
inputline = keyboard.readLine();//read the keyboard
System.out.println(" i'm in the loop");
DiskOut.println( inputline );
DiskOut.flush();
inputline = keyboard.readLine();//read the keyboard again
}//end while
Also, I have tried this while statement
while( inputline =="\n" || inputline == "\r" || inputline == null)
please help!!

Answer 1

Your code won't even compile. The part between "while" and "{"
has too many right-parentheses.
What are "keyboard", "DiskOut", etc.? You'll probably need to provide
more details, plus the actual code you're trying to debug, before anybody can help you.
Assuming "inputline" is a String, then that alternative while expression wouldn't work anyway. You can't compare Strings with "==" (at least not in the way you probably mean).
The following code does something which seems to be roughly what you want:
import java.io.*;
public class Foo {
  public static void main(String[] argv) {
    try {
      BufferedReader foo = new BufferedReader(new InputStreamReader(System.in));
      String line;
      while((line = foo.readLine()) != null) {
        doSomething(line);
    } catch (IOException e) {
      e.printStackTrace();
  public static void doSomething(String it) {
    // do something here
}But note that the while loop doesn't end when someone inputs a blank line; it ends when the stream ends, which in this case is when someone inputs EOT (in unix systems, Control-D).
readLine() doesn't return null on blank lines.
If that's what you're looking for, then maybe you want to end your while loop when inputline.length() == 0.