There's an error on line 155 in the CDoublyLinkedList class

I'm not sure how to compare the objects

what is the purpose of the program?

to make a circular doubly linked list and test it

@ThisIsChris can you help me with this?

@Jacob
line 155-156 is:
```java
if (sortedCurr.data.equals(curr.data) ||
sortedCurr.data.compareTo(curr.data) > 0)
```

I'll let Chris handle this one.

try changing it to:
```java
if ( (sortedCurr.data.equals(curr.data)) ||
(sortedCurr.data.compareTo(curr.data) > 0) )
```

it still gives an error

What's the error?

"The method compareTo(Object) is undefined for the type Object"

You're missing a (

where?

and why would that make the compareTo method undefined?

before sorted

second line

Doesn't look like it's closed

nah all the parentheses are closed

I changed it to the one Chris sent

I'm not getting any errors from parentheses

@Jacob `data` is an Object, how do you know it implements the Comparable interface?

```java
javac Tester.java
./CDoublyLinkedList.java:155: error: cannot find symbol
(sortedCurr.data.compareTo(curr.data) > 0)) {
^
symbol: method compareTo(Object)
location: variable data of type Object
1 error
```

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