TestTypes.java

import java.util.Set;
import java.util.HashSet;

public class TestTypes {
    public static void main(String[] args) {
        Class<?> t = Set.class;
        Object s = new HashSet<String>();
        Object n = new Integer(-1);
        System.out.println(t.isInstance(s)); // true
        System.out.println(t.isInstance(n)); // false
    }
}