ClassCastException : cant be cast to java.lang.Integer

Question

I know this has been asked a lot in stackoverflow but I could not find answers that work to my problem.

In the following code below, I cant print out each item in

Answer 1

You declare:

int from;
int to;
int type;

and you should declare them as Integers instead:

Integer from;
Integer to;
Integer type;

because later on you're doing:

this.from = new Integer(from);

etc.

A better option would be to change the assignment to:

this.from = from;

which would also solve this error since you would be assigning an int to an int. Is there a purpose you're using new Integer() ? because if not - I would suggest removing it - it's slower (performance-wise) comparing to the primitive int.

Bottom line: stay consistent and either use int throughout the code, or Integer - try not to mix them unless it's really required.