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  1. PO
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    <p>I cleaned up a bit your code so it compiles, you might be better off with two classes</p> <p>Josephus.java</p> <pre><code>import java.util.Scanner; public class Josephus { public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.println("How many players"); int numPlayers = in.nextInt(); Link first = new Link(1); Link last = new Link(1); for (int k = 2; k &lt;= numPlayers; k++) { last.next = new Link(k); last = last.next; } last.next = first; first.next = last; System.out.println("How many skips"); int m = in.nextInt(); for (int g = 0; g &lt; numPlayers; g++) { for (int k = 0; k &lt;= m; k++) { last = last.next; } // last.next; last = last.next; } in.close(); } } </code></pre> <p>and Link.java</p> <pre><code>public class Link { public int num; public Link next; public Link(int d) { num = d; next = null; } } </code></pre> <p>This compiles and accepts input, then throws an error. I haven't fixed that since I don't know exactly what you're trying to achieve.</p> <p><strong>Changes:</strong></p> <ol> <li>Changed `"class main"` to `public static void main(){...)` The Java runtime will look for this method when it's called.</li> <li>Extracted class `Link` to it's own file other solutions are possible, like some other answers say, you could declare it as static or instantiate `Josephus` (and probably some other ways)</li> <li>Commented out the line `last.next`, this doesn't actually solve any problem, it just eliminates the compilation error and allows you to compile, since I don't see what you're trying to do here I couldn't think of a better solution. </li> <li>It's not necessary to compile but I added the line `in.close();` at the end of the main method to free allocated resources, without this line it'll throw a compile warning. </li> <li>Added `first.next = last;` to avoid the null pointer exception that was happening.</li> </ol> <p>All that you should need now is to implement the Josephus logic inside the nested loops and output your results (if desired) all of which should be quite language agnostic.</p>
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    1. COThe purpose of the program is to use link lists to make a circular list and at specific intervals delete numbers until only one is left. Thank you for using my code, and I don't want to be a bother, but can you explain why those changes fixed things?
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    2. COLike some other users suggested, the easiest thing for you to do might be to paste your code into an editor, I suggest Eclipse. The IDE will highlight the errors in your code and give you an explanation for most of them. Some things I'll add an edit explaining some of the modifications.
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