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Thread: get console to work

  1. #1
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    Default get console to work

    Hi, in the eclipse console i get the output from line 11 saying "No console".
    My question is, what can i do to get the console to work?

    import java.io.Console;
    import java.util.Arrays;
    import java.io.IOException;
     
    public class Password {
     
        public static void main (String args[]) throws IOException {
     
            Console c = System.console();
            if (c == null) {
                System.err.println("No console.");
                System.exit(1);
            }
     
            String login = c.readLine("Enter your login: ");
            char [] oldPassword = c.readPassword("Enter your old password: ");
     
            if (verify(login, oldPassword)) {
                boolean noMatch;
                do {
                    char [] newPassword1 =
                        c.readPassword("Enter your new password: ");
                    char [] newPassword2 =
                        c.readPassword("Enter new password again: ");
                    noMatch = ! Arrays.equals(newPassword1, newPassword2);
                    if (noMatch) {
                        c.format("Passwords don't match. Try again.%n");
                    } else {
                        change(login, newPassword1);
                        c.format("Password for %s changed.%n", login);
                    }
                    Arrays.fill(newPassword1, ' ');
                    Arrays.fill(newPassword2, ' ');
                } while (noMatch);
            }
     
            Arrays.fill(oldPassword, ' ');
     
        }
     
        //Dummy change method.
        static boolean verify(String login, char[] password) {
            // this method always returns true in this example.
            // modify this method to verify password according to your rules.
            return true;
        }
     
        //Dummy change method.
        static void change(String login, char[] password) {
            // modify this method to change password according to your rules.
        }
    }


  2. #2
    Administrator copeg's Avatar
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    Default Re: get console to work

    Typically this is done by using a Scanner that wraps the System.in InputStream.

    Scanner in = new Scanner(System.in);
    System.out.println("Please enter something:");
    String something = in.nextLine();

  3. #3
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    Default Re: get console to work

    Ok scanner is nice, althought i'm still intrested to get the console to work.
    Also the code above (in my first post) is no what i needed, i need it for something else, but since i had a console problem i looked for other console examples and i just posted one of them that wasn't working here.

  4. #4
    Super Moderator helloworld922's Avatar
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    Default Re: get console to work

    There's a nice process to use a remote debugger described at Stack-Overflow: java.io.Console support in Eclipse IDE - Stack Overflow

    If you just want to run the program and not debug it, use the command-line to start the java program and you'll get access to the console.

    In future updates of Eclipse this may be changed so it would be more convenient (it's being discussed here: https://bugs.eclipse.org/bugs/show_bug.cgi?id=122429).

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