- Collection framework.
- Collection interfaces.
- Set interface
- SortedSet interface
- List interface
- Map interface
- Map.Entry interface
- SortedMap interface
- Queue interface
- Deque interface
- Enumeration interface
- Collection classes
- HashSet
- LinkedHashSet
- TreeSet
- ArrayList
- LinkedList
- HashMap
- LinkedHashMap
- TreeMap
- PriorityQueue
- ArrayDeque
- Abstract classes in collection framework
- Sorting
- Comparable interface
- Comparator interface
- Properties class
- Hashtable
- ListIterator interface
- Java Vector class
- ArrayList vs LinkedList vs Vector
- Iterator vs ListIterator vs Enumeration
- List vs Set Vs Map
- HashSet vs LinkedHashSet vs TreeSet
- HashMap vs LinkedHashMap vs TreeMap vs HashTable
- HashSet vs HashMap vs HashTable
- Collection vs collections
- Comparable vs Comparator interfaces
- Java hashcode and equals methods
- HashMep internal working
- HashMap null key
- HashSet internal working
- Collection framework interview programs