Java typecasting error - Overclock.net

rmvvwls · 4 Weeks Ago

Okay, I have a Java program that's supposed to build a concordance, and it's throwing a weird error.

Quote:

cannot find symbol
symbol: method addLine(int)
location: interface java.lang.Comparable

The line returning this looks like:

Code:

letters[listLocation].returnNode(entry).addLine(numLines);

Letters is an array holding custom written Binary Search Tree (BST) objects, typecast to hold custom written Word objects. addLine is a method in Word, but it can't seem to find it.

Letters is declared as such:

Code:

BST[] letters = new BST[26]; //create the array of letters
        for (int i=0; i<26; i++){ //create one for each letter
            letters[i] = new BST();
        }//end for

Any ideas?

rabidgnome229 · 4 Weeks Ago

What is the definitions of Word.addLine?

rmvvwls · 4 Weeks Ago

Code:

//adds a line number to a word
        public void addLine(int line){
            lines.add(line);
        }

I believe now it may have something to do with the method returnNode.
Working on it now.

rabidgnome229 · 4 Weeks Ago

From the error message it looks like returnNode returns a Comparable rather than a Word

rmvvwls · 3 Weeks Ago

Quote:

Originally Posted by rabidgnome229

From the error message it looks like returnNode returns a Comparable rather than a Word

That's what was confusing me. I didn't understand at the time how it COULD return a comparable, seeing as comparable is an interface, not an object.
But for some reason it was returning a generic object, and describing it as comparable. Changing it to

Code:

Word toModify = (Word)letters[listLocation].returnNodeContents(entry);
toModify.addLine(numLines);

and typecasting it that way worked. Extra line, but I can deal with that.
Thankyou for taking the time to help nevertheless. rep+

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Java typecasting error

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