Which of these packages contain all the collection classes in the Java Collection Framework? Which of these packages contain all the collection classes in the Java Collection Framework? A) java.io B) java.lang C) java.util D) java.awt Answer: C) java.util Explanation: java.io focuses on input/output operations and doesn’t contain collection classes. java.lang contains fundamental classes like Object and String, not collection classes. java.util is the primary package containing all the core collection framework classes and interfaces, including ArrayList, HashMap, HashSet, LinkedList, List, Set, Map, etc. java.awt deals with the graphical user interface (GUI) components and doesn’t contain collection classes.