Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Java Java Arrays Iteration Looping Like These Programmers

Cristian Luca
Cristian Luca
4,102 Points

java.util.UnknownFormatConversionException: Conversion = '.' (Look around Formatter.java line 2579)

public class Programmers {

public void printMenu() { String[] programmers = { "Yukihiro Matsumoto", "David Nolen", "Grace Hopper", "Linus Torvalds", "You" };

System.out.println("Choose a programmer:");
for (int i = 0; i < programmers.length; i++) {
  System.out.printf("d%. %s%n", i+1, programmers[i]);
}
// TODO: Print out a menu by looping through the programmers array.
/*
  The menu should be in the form of (each on a line of its own, starting with 1):
  1. Yukihiro Matsumoto
  2. David Nolen
  ...
*/

}

}

Programmers.java
public class Programmers {

  public void printMenu() {
    String[] programmers = {
            "Yukihiro Matsumoto",
            "David Nolen",
            "Grace Hopper",
            "Linus Torvalds",
            "You"
    };

    System.out.println("Choose a programmer:");
    for (int i = 0; i < programmers.length; i++) {
      System.out.printf("d%. %s%n", i+1, programmers[i]);
    }
    // TODO: Print out a menu by looping through the programmers array.
    /*
      The menu should be in the form of (each on a line of its own, starting with 1):
      1. Yukihiro Matsumoto
      2. David Nolen
      ...
    */


  }

}

1 Answer

Steven Parker
Steven Parker
229,606 Points

It's just a typo in the conversion token. You have "d%" instead of "%d".