Hi Friends,
I have a loop in my program that asks the user to enter a number,I want that if the user presses the 'enter' key instead of entering any number,then the loop should exit.
But I don't know how to detect the 'enter' key as I am not using any GUI or ActionListener classes,is there some ASCII code for the enter key,that I can read and exit the loop.
Please help.
Thanks Smith,
Got the answer in another forum,posting it here for someone like me ,incase he needs in future...lol
BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
if (input.length()==0){
break;
}
You can use the following method to detect the enter key;
import java.util.*;
public class detector
{
public static void main(String [] args)
{
Scanner keyboard = new Scanner(System.in);
System.out.println("Enter a line of input");
String inputdata = keyboard.nextLine();
int value = inputdata.length();
char c = ' ';
for(int i =0; i<value; i++)
{
c = inputdata.charAt(i);
if(c=='\n') //'\n' is the ASCII key for Enter
{
break;
}
}
Hope This Helps You Out...>
import java.util.*;
public class detector
{
public static void main(String [] args)
{
Scanner keyboard = new Scanner(System.in);
System.out.println("Enter a line of input");
String inputdata = keyboard.next();
int value = inputdata.length();
char c = ' ';
for(int i =0; i<value; i++)
{
c = inputdata.charAt(i);
if(c=='\n') //'\n' is the ASCII key for Enter
{
break;
}
}
>
import java.util.*;
public class detector
{
public static void main(String [] args)
{
char c = ' ';
int number;
while(c!='\n')
Scanner keyboard = new Scanner(System.in);
System.out.println("Enter data");
String inputdata = keyboard.next();
c = inputdata.charAt(0);
try
{
number = Integer.parseInt(inputdata)
}
catch(NumberFormatException e)
{
System.out.println("Not a valid Number or an Enter key");
inputdata = keyboard.next();
c = inputdata.charAt(0);
}
}
}
}
> I appologize for necroposting, but can I use this
> same method to detect some key other than the enter
> key?
You couldn't do that prior to Java 6. I don't know if it's possible to do it using the Reader returned by Console.reader in Java 6. You could give it a try.
The reader returned might still only allow reading of data after enter is pressed.
Kaj
