Question

I am trying to run my linked list in a main method, but for some reason I keep getting the following output from my terminal

    Exception in thread "main" java.lang.NoClassDefFoundError: PhoneBook/java
Caused by: java.lang.ClassNotFoundException: PhoneBook.java
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

Below I have listed the part of my class where I run the main method. Everything compiles fine, but when I run it I get that exception. Is there away I can try/catch the exception? Or is there something I am doing wrong?

import java.util.LinkedList;

 public class PhoneBook<T> extends LinkedList<T>{

  /**
  * Creates two books, adds a person to each book, then prints out if it
  * found the perons in the book.
  **/
  public static void main(String[] args){
    PhoneBook<String> bookOne = new PhoneBook<String>();
    PhoneBook<Integer> bookTwo = new PhoneBook<Integer>();

    bookOne.addPerson("Obama");
    System.out.print(bookOne.findPerson("Obama"));

    bookTwo.addPerson(192590594);
    System.out.print(bookTwo.findPerson(192590594));
  }

If more information from my class is needed, I can provide it. I don’t think it should be necessary because it compiled fine.

Answer 1

After compiling with javac PhoneBook.java are you launching it using
java PhoneBook or java PhoneBook.java ? (it should be the former not
the latter). ~Charlie

Thanks Charlie, that was it.