Java help

• Cucurbita wrote on 2011-09-29 01:26
  I can never find a way to keep away from this damn site.
  
  I need to crowd source real quick because its late and no one can help me. Google and my textbooks have failed me as well.
  
  I'm writing a toy program in which I must ask the user for an input, and I output that input by replacing all the spaces with an underscore.
  
  Wrote something that looks like this:
  
  public static void main(String[] args) {
  
  Scanner in = new Scanner(System.in);
  System.out.println("Input filename");
  String filename = in.next();
  String output = filename.replaceAll(" ", "_");
  System.out.println(output);
  
  }
  
  
  If the filename string wasn't a scanner input, this would actually work. The result for this particular program, however, only prints out the first word of the input and throws out the rest of it.
  
  If the replace method tries to replace a letter in the first word, then it works.
  
  If I don't use the replace method, the output comes out fully like it should.
  
  What am I doing wrong? Would be fantastic if someone who knows how to program could lend a hand... soon.
• Yoorah wrote on 2011-09-29 01:38
  My Java is rusty, but.. >.< Tried putting it in a while in.hasNext() loop? Otherwise, scanner will only look at the first token.
• Cucurbita wrote on 2011-09-29 01:49

  Quote from Yoorah;602570:

  My Java is rusty, but.. >.< Tried putting it in a while in.hasNext() loop? Otherwise, scanner will only look at the first token.

  
  
  Theres gotta be another option. The class hasn't touched loops yet so the professor definitely doesn't want us to be using loops for this.
  
  Another program I'm stuck on is to have the user input a name, and I only display the first 10 letters.
  
  System.out.println("What is your name?");
  Scanner in = new Scanner(System.in);
  String name = in.next();
  String chopped = name.substring(0, 10);
  System.out.println(chopped);
  
  This works only if the word is 10 letters or longer. If its shorter, it gives me an error.
  
  Same thing happens, only keeps the first token.
  
  Also, the assignment hints at using Math.min method but I have no idea how I could use it to work this program.
• Yoorah wrote on 2011-09-29 02:19
  Hmm nvm about my suggestion with the first one, I'm confused and my brain is half-asleep due to getting 3 hours of sleep for 2 days in a row. =_=
  The general idea would be to use the scanner to grab a line from the text file, and put that in a string. Then you can use the replaceAll to change the whole string.
  EDIT: halp? http://stackoverflow.com/questions/5444978/replace-string-java-scanner-class
  
  For the second one, one way to do it with math.min is to count the number of chars in the string with line.length() or something. Then you can compare that number with 10, and math.min will pick the lower one. Then you can use that lower number to do the actual chopping. xd
• Cucurbita wrote on 2011-09-29 02:56
  Okay, so it was
  
  String filename = in.next();
  
  Should've been
  
  String filename = in.nextLine();
  
  I will hate myself forever now for struggling an hour with this.