Please read the following diagram carefully, and answer Question 2.1 - 2.3 java.lang > Iterable iterator0: Iterator> Collection > Iterator thasNext0 boolean +size): int isEmpty0:boolean +next) E IVI > List Ma +add(element E): boolean add(index: int, element E): boolean tclear0) +get(index int) E tremove(element E): boolean sort(c Comparator) tadd(element: E) boolean clear) remove(element: E) boolean +clear) +containsKeykey: K): boolean get(key: K): V tisEmpty0 boolean +keySet(): Set HashSet +HashSet0 ArrayList +ArrayList0 LinkedList IVI IVI +LinkedList() TreeMap HashMa HashMap0 TreeMap( 2.1 How many packages are in the diagram? What are they? 2.2 What doand represent respectively? What is the difference between them? 2.3 Why methods in an interface are italicized