How to iterate over the vector in Java and store only the specified class?

Assume you have a class Method, then code could be something like :

    List<Method> list = new ArrayList<Method>();
    for (Object obj : vector) {
        if (obj instanceof Method) {
            list.add(obj);
        }
    }

In Java 8, you can invoke the .stream() method that returns a stream of the vector elements, so storing the elements, for example in a list, can be done by invoking a Collector

Vector<String> vec = new Vector<>();
vec.add("hello");
vec.add("world");

List<String> list = vec.stream().collect(Collectors.toList());

Wasn't anyone concerned about iterating the Vector without synchronization?

If vector is not thread-confined, in the presence of another thread modifying its contents, the for-each iteration might throw ConcurrentModificationException.