How to use external class files in an Eclipse project

Question

My teacher did not provide us .java files for the tutorial. My question is: how can I use its class files in my eclipse project and defeat the following error?

Error:

  Exception in thread "main" java.lang.NoClassDefFoundError: lec/utils/InputReader
 at randomIt.main(randomIt.java:17)
    Caused by: java.lang.ClassNotFoundException: lec.utils.InputReader
     at java.net.URLClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
            at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     ... 1 more

Here is my code:

 import java.util.Random;
    import lec/utils.InputReader;

    public class randomIt {

 public static void main(String[] args) {
  Random generator = new Random();
  InputReader myReader = new InputReader();
  //Pick a number randomly between 1 and 10!
   int number = generator.nextInt(10)+1;
  //Ask user to guess...!
   System.out.println("Take a guess (1 to 10)");
   if (number == myReader.readInt()){
    System.out.println("You win");
   }
   else {
    System.out.println("It was " + number + ", tough Luck");
  }
 }

And here is my folder structure:
Random /
     * / bin
    * / lec / utils / InputReader
    * / src / randomIt.java

Note: its class file is "InputReader.class"

Answer 1

I had a game with Eclipse to work on this. Give the following:

• Create the following directory structure (your desktop will do) classes / lec / utils
• InputReader utils.
• , InputReader, .
• ( ) Properties- > Java Build Path- > " " "classes", , "".
• " " "classes" "lec.utils", InputReader.
• , "import lec.utils.InputReader" .

, .

Answer 2

" → ". " ". .

Answer 3

• randomIt, ( lecs/) import utils.InputReader

• rnadmIt.java( randomit.java). fie . Sun

• $cd $ javac -classpath./lec src/randomIt.java