How can check if we can cast an object to another?

Question

I have an object that it is an Arraylist of instances of an class that can be dynamically in 2 other class. How can I check that I can cast my object to each of them Arraylist class?

For example:

My classes are class1, class2 and class3.
My object is obj.

I want check it:

ArrayList<class1> ar1=new Arraylist<class1>(); ar1=(ArrayList<class1>)obj;

How can I check if it can be true or false?

have you ever heard about 'instanceof'? and also "convert" is the correct spelling. — Juvanis
– Juvanis, Commented Jul 20, 2013 at 7:17
Please refer to stackoverflow.com/questions/7526817/use-of-instance-of-in-java — John Snow
– John Snow, Commented Jul 20, 2013 at 7:30
Post linked by John Snow is a good place to start. But instanceof should be hardly needed when application is properly designed - please see <? extends T> construct - stackoverflow.com/questions/897935/… — Grzegorz
– Grzegorz, Commented Jul 20, 2013 at 8:35
possible duplicate of What is the 'instanceof' operator used for? — djf
– djf, Commented Jul 20, 2013 at 11:14

John Snow · Accepted Answer · 2013-07-20 07:35:56Z

Something like this :-

import java.util.ArrayList; public class qu { public static void main(String args[]) { ArrayList<String> ar1=new ArrayList<String>(); ArrayList<Character> obj = new ArrayList<Character>(); if(obj instanceof java.util.ArrayList) System.out.println("My problem Solved"); } }

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