https://docs.oracle.com/javase/7/docs/api/java/lang/Comparable.html

is there a way I can make it implement comparable class?

I'm not sure how much I'm supposed to modify this assignment

or is there a better way to do insertion sort?

@ThisIsChris

You can try to call the compareTo method and then catch an Exception if compareTo is not implemented

how do I do that?

I feel like there's a better way that I'm missing, since this is part of the assignment and I don't think he wants us to modify the given code

well, besides filling in the methods

@ThisIsChris

maybe I could cast the object?

the tester class only uses characters

@Jacob Cast it as Comparable?

or maybe as a char

or integer if that's possible

I don't know

@ThisIsChris

@Jacob
line 4
```java
private Object data; //Assume data implemented Comparable
```

OK... you can assume that, but Java is going to want that declared somewhere

or it will refuse to compile

I think he really may want you to try/catch

God

I did this stuff like two years ago

I got a Java developer certificate when I graduated high school

and we did try catch and everything

```java
try {
your code;
}
catch Exception {
//leave empty lol
}
```

we also did Linked Lists I think

put that inside the method?

the entire method? @ThisIsChris

I'd put the `try` at line 148, just before the while loop, don't want that thing to go on catching exceptions forever waiting for the loop to break

so put the entire loop inside it?

so
```java
try {
//lines 149-163, the whole outer while loop, until just before the function ends
}
catch Exception {
//leave blank because we're supposed to assume nothing will happen
}
//then exit the function
}
``` @Jacob

thanks

okay now I have a new exception

here is my new code

```java
------------------testAddLast()----
Exception in thread "main" java.lang.NullPointerException
at MyLinkedList$ListNode.access$2(MyLinkedList.java:11)
at MyLinkedList.add(MyLinkedList.java:205)
at MyLinkedListTester.testAddLast(MyLinkedListTester.java:42)
at MyLinkedListTester.main(MyLinkedListTester.java:214)
```

@ThisIsChris

That's good, different errors now

Unfortunately it's 2am here so I have to get to bed

okay thanks for your help