Reading from keyboard

[Stephen Murphy]

I am trying to implement a simple game program. I need to read a word from the user, or exit if no word is entered. I am having trouble getting the program to exit.

My code:

       InputStreamReader isr = new InputStreamReader(System.in);
    BufferedReader br = new BufferedReader(isr);
 
    System.out.print("Enter a word to search for : "); //Prompts for a word
    String inLine = br.readLine(); //Reads a word from the keyboard
    while((inLine != null))
     {
       toFind = inLine;
 
    System.out.print("Enter a word to search for : "); //Prompts for a word
    inLine = br.readLine(); //Reads a new word from the keyboard
     }
            if(inLine == null)
             {
               System.exit(0);
             }

[ February 25, 2005: Message edited by: Patrick Murphy ]

[Ernest Friedman-Hill]

readLine() will return null only if the user closes standard input -- i.e., by typing Control-Z on Windows, or Control-D on UNIX. Otherwise if they just hit Enter, readLine() will return a String object whose contents are "" -- i.e., a zero-length String. This is a different thing altogether than null, which is no String.

You want to do something like

                   while(inLine != null && inLine.length() > 0)
     {
         toFind = inLine;
  
    System.out.print("Enter a word to search for : "); //Prompts for a word
    inLine = br.readLine(); //Reads a new word from the keyboard
     }
 
                     System.exit(0);

[ February 25, 2005: Message edited by: Ernest Friedman-Hill ]

[nabi bux]

import java.io.*;

class Show
{
public static void main(String aff[])
throws Exception
{
InputStreamReader isr = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(isr);
System.out.print("Enter a word to search for : ");
String toFind=" ";
String inLine = br.readLine(); //Reads a word from the keyboard
while((inLine.length() >0)) {
toFind = inLine;
System.out.print("Enter a word to search for : ");

inLine = br.readLine(); //Reads a new word from the keyboard
if(inLine == null)
{
System.exit(0); }}


}}

write down the above code when you type nothing length() function return -1
this cause you loop will end program also thank!