How can I input strings into java?

Question

I know I have to use the Scanner class to first create the scanner object to receive user input in java, although I don't know how to input multiple words into one string variable. For example, I have this code here:

System.out.println("Please enter the following information");

System.out.print("Author:");
author = input.nextLine();

System.out.print("Title:");
title = input.nextLine();

System.out.print("Grade Level:");
gradeLevel = input.nextDouble();


System.out.print("Pages:");
pages = input.nextDouble();

Which according to many forums, should allow the user to input the entire line into the String variable, but instead, it skips the Author prompt entirely. What am I doing wrong?

EDIT: I have added the full loop below:

do {

    System.out.printf("What kind of book is this?\n"
            + "(0 = Textbook, 1 = Novel, 2 = Biography, 3 = Author Information, 4 = Other)");

    switch(input.nextInt()) {
        case 0:
            System.out.println("Please enter the following information.");

            System.out.print("Author:");
            author = input.nextLine();

            System.out.print("Title:");
            title = input.nextLine();

            System.out.print("Grade Level:");
            gradeLevel = input.nextDouble();
            input.readLine();

            System.out.print("Pages:");
            pages = input.nextDouble();

            //Creation of textBooks
            texts[i] = new Textbook(gradeLevel, author, pages, title);

            boolText = true;
            break;
        case 1:
            System.out.print("Please enter the following information.\n");

            System.out.print("Author:");
            author = input.nextLine();
            System.out.print("Genre:");
            genre = input.next();
            System.out.print("Title:");
            title = input.nextLine();
            System.out.print("Pages:");
            pages = input.nextDouble();

            //Creation of Novels
            novels[i] = new Novel(genre, title, author, pages);

            boolNovel = true;
            break;
        case 2:
            System.out.print("Please enter the following information.\n");

            System.out.print("Author:");
            author = input.nextLine();
            System.out.print("Title:");
            title = input.nextLine();
            System.out.print("Subject:");
            subject = input.nextLine();
            System.out.print("Pages:");
            pages = input.nextDouble();

            //Creation of Biographies
            bio[i] = new Biography(subject, title, author, pages);

            boolBiography = true;
            break;
        case 3:
            System.out.print("Please enter the following information.\n");

            System.out.print("Author:");
            author = input.nextLine();
            System.out.print("Email:");
            email = input.next();
            System.out.print("Address:");
            address = input.nextLine();
            System.out.print("Number of Titles:");
            numOfTitles = input.nextDouble();

            //Creation of Author Infortmation
            authors[i] = new Author(author, address, email, numOfTitles);

            boolAuthor = true;
            break;
        case 4:
            System.out.println("Please enter the following information.");

            System.out.print("Title:");
            title = input.nextLine();
            System.out.print("Author:");
            author = input.nextLine();
            System.out.print("Pages:");
            pages = input.nextDouble();

            //Creation of Author Infortmation
            other[i] = new Books(title, author, pages);

            boolOther = true;
        default:
            System.out.println("Program will now terminate.");
            System.exit(1);
    }

    i++;
    }
    while (i < t);

Reimeus · Accepted Answer · 2014-02-27 14:32:30Z

4

Ordinarily this does work but more than likely you are using this code in a loop. Since nextDouble does not consume newline characters you will need to consume this character explicitly

pages = input.nextDouble();
input.readLine() // added - consumes newline

edited Feb 27, 2014 at 14:32

answered Feb 27, 2014 at 14:26

Reimeus

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Comments

Keerthivasan · Accepted Answer · 2014-02-27 14:32:11Z

2

Since you are running it inside a loop

pages = input.nextDouble();
input.readLine()

This will solve it. That's why Author prompt just skips to next since it has got the input. i.e \n (new line character from previous double input value)

answered Feb 27, 2014 at 14:32

Keerthivasan

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3 Comments

Rudi Kershaw Over a year ago

Am I missing something, where has he said this is in a loop?

Keerthivasan Over a year ago

Generally, skipping problem happens in loop because of unconsumed characters

Brian Over a year ago

I tried adding input.readLine() but netbeans gave me errors. From what I understand, netbeans is taken each word for the author name as separate variables.

Dominick Piganell · Accepted Answer · 2014-02-27 14:27:34Z

1

Do you have this in a loop? There's probably a /n character still in the buffer. At the top, add: input.nextLine();

answered Feb 27, 2014 at 14:27

Dominick Piganell

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1 Comment

Brian Over a year ago

Yes, sorry this is in a switch statement that's within a do-while loop.

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