Question

I have the following classes:

public class CollectionCustomClass extends ArrayList<CustomClass>
public abstract class CustomClass
public class SubClass1 extends CustomClass
public class SubClass2 extends CustomClass

and in a method i want to do the following:

CollectionCustomClass ccc = new CollectionCustomClass();
ccc.add(new SubClass1())
ccc.add(new SubClass2())
ccc.add(new SubClass1())
ccc.add(new SubClass2())

ccc.find(SubClass1)

The result would be the 2 Subclass1.

How can i achieve this?

Answer 1

Try

 ccc.find(SubClass1.class);

and

 class CollectionCustomClass<T> extends ArrayList<CustomClass>{

    public CustomClass find(Class<T> clazz) {
        for(int i=0; i< this.size(); i++)
        {
            CustomClass obj = get(i);
            if(obj.getClass() == clazz)
            {
                return obj;
            }
        }
        return null;
    }
 }