[Java]how can I complete this classification program.

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How can I complete this classification program. I would like to add element to corressponding array list.

public class Classification<T> {
    private ArrayList<T>integer = new ArrayList<T>();
    private ArrayList<T>Double = new ArrayList<T>();
    private ArrayList<T>string = new ArrayList<T>();
    private ArrayList<T>character = new ArrayList<T>();
    public void add(T t){
        if (t.toString()==t){
            string.add(t);
        }else{
            integer.add(t);
        }
    }
}

What I have tried:

I try to use

if ((double)t == t){
    Double.add(t) 
}

However, it gives me an error message which is operator == cannot be applied to T

Posted 2-Feb-17 19:57pm

Member 12980589

Updated 2-Feb-17 20:51pm

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CPallini · Answer 1 · 2017-02-02T20:51:00

Quote:
public class Classification<t> {

Since your class should classify passed data, it makes no sense making it dependent upon a generic parameter.

Quote:
private ArrayList<t>integer = new ArrayList<t>();
private ArrayList<t>Double = new ArrayList<t>();
private ArrayList<t>string = new ArrayList<t>();
private ArrayList<t>character = new ArrayList<t>();

Why are you creating generic ArrayList when you know in advance they will hold just one type. For instance, why don't you use

Java

private ArrayList<Integer>integer = new ArrayList<Integer>();

?

Quote:
I would like to add element to corressponding array list.
Hi

Just write the corrensponding overloaded add method, e.g.

Java

public void add(Integer t)
{
  // add to 'integer' ArrayList
}