java.lang.ClassCastException: java.lang.String cannot be cast to components.Student

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Hey,
I have a problem, I get an error in my java code, I'm not sure to understand why it is there. What I am trying to do is to print the city of each student. student is an object, which as one function which is city. City will return a string if called. Each student object is stored in an arrayList called full.
Here is my code:

Java

for (int i = 0; i < full.size(); i++){
            System.out.println(full.get(i).city().toString());
        }

and the error is the following:

Exception in thread "Thread-0" java.lang.ClassCastException: java.lang.String cannot be cast to components.Student
	at components.ClientThread.createTable(ClientThread.java:202)
	at components.ClientThread.run(ClientThread.java:88)

Posted 20-Dec-14 19:57pm

Member 11322545

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Richard MacCutchan 21-Dec-14 3:19am

Are you certain that is the line where the error occurs? Also, why are you calling toString on a string object?

Member 11322545 21-Dec-14 7:55am

wall, that is was eclipse says and I called toString to try, I also tried without it and same error.

Richard MacCutchan 21-Dec-14 8:35am

Eclipse does not say such things. You need to understand that if a method returns a string then you do not need to (and should not) call toString on it. And you have not answered my first question, I suspect the code you have shown us is not where the error occurs.

Member 11322545 21-Dec-14 8:50am

The line number from eclipse is that line, exactly that line. I do understand that, and I have tried without the toString but no result. I have tried to remove the line, and when I remove it no problem.

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TorstenH. · Answer 1 · 2014-12-22T03:09:00

Well, seems like you're returning an Object there.

Heave you debugged it?

Try this instead: