Java Collections
From Fundamentals to Advanced Applications
Table of Contents
Chapter 1: Introduction to Java Collections Framework
1
What are Collections?
1
Overview of the Java Collections Framework (JCF)
2
Interfaces and Implementations
4
Set Up Your Development Environment
7
Runnable Example: Basic List and Set usage
9
Chapter 2: Core Interfaces and Their Implementations
11
Interface Overview
11
Interface and Implementations (ArrayList, LinkedList)
13
Interface and Implementations (HashSet, LinkedHashSet, TreeSet)
16
Interface and Implementations (LinkedList, PriorityQueue)
20
Examples: Creating and manipulating Lists, Sets, and Queues
22
Chapter 3: Iterating Over Collections
24
Iterator and ListIterator
24
For-Loop
28
API Basics (intro)
30
Examples: Different ways to iterate and modify collections
32
Chapter 4: Lists in Detail
35
ArrayList vs LinkedList: Internal workings
35
When to use which List?
37
Common Operations and Performance Considerations
39
Runnable Examples: Add, remove, sort, search in Lists
41
Chapter 5: Sets in Detail
44
HashSet vs LinkedHashSet vs TreeSet
44
Handling Duplicates and Ordering
46
Using Comparable and Comparator with Sets
48
Runnable Examples: Implementing sets with custom objects
51
Chapter 6: Queues and Deques
54
Queue Interface and Implementations
54
PriorityQueue and Natural Ordering
56
Deque Interface: ArrayDeque and LinkedList
59
Runnable Examples: FIFO, LIFO, Priority Queues
62
Chapter 7: Understanding Maps
65
Map Interface and Implementations (HashMap, LinkedHashMap, TreeMap, Hashtable)
65
Key-Value Pairs and Common Use Cases
68
Runnable Examples: Basic Map usage, updating, and querying
71
Chapter 8: Advanced Map Concepts
74
Custom Key Classes and equals/hashCode contracts
74
NavigableMap and SortedMap
77
WeakHashMap, IdentityHashMap, ConcurrentHashMap
80
Runnable Examples: Creating custom keys, using advanced maps
83
Chapter 9: Specialized Collections
86
EnumSet and EnumMap
86
BitSet
89
Stack and Vector (Legacy Collections)
92
Runnable Examples: Using specialized collections in real scenarios
94
Chapter 10: Collections Utility Class
97
Common Utility Methods (sort, shuffle, reverse, binarySearch)
97
Synchronized and Unmodifiable Collections
99
Runnable Examples: Using utility methods effectively
101
Chapter 11: Performance and Memory Considerations
104
Understanding Time and Space Complexity
104
Choosing the Right Collection for Your Use Case
106
Memory Footprint of Collections
108
Runnable Examples: Performance comparisons
110
Chapter 12: Generics and Collections
113
Using Generics with Collections
113
Wildcards, Bounded Types, and Type Safety
115
Runnable Examples: Creating generic collection methods
117
Chapter 13: Concurrent Collections
119
Thread Safety Issues with Collections
119
java.util.concurrent Collections (ConcurrentHashMap, CopyOnWriteArrayList, BlockingQueue)
121
Runnable Examples: Basic concurrent collections usage
127
Chapter 14: Streams and Functional Programming with Collections
129
Introduction to Streams API
129
Filtering, Mapping, Reducing Collections
131
Collectors and Parallel Streams
134
Runnable Examples: Functional-style collection processing
137
Chapter 15: Advanced Collection Patterns and Best Practices
140
Immutable Collections (Java 9 List.of, Set.of, Map.of)
140
Builder Patterns for Collections
142
Custom Collection Implementations
144
Runnable Examples: Creating immutable collections and custom data structures
147
Chapter 16: Real-World Applications of Collections
150
Implementing a Simple Cache with Map
150
Using Collections in Data Processing Pipelines
153
Collections for Graph and Tree Structures
155
Chapter 17: Case Study: Building a Mini Search Engine
158
Indexing Text with Maps and Sets
158
Query Processing with Queues and Lists
161
Chapter 18: Case Study: Event-Driven Programming with Queues
164
Using Queues for Event Handling
164
Priority Scheduling with PriorityQueue
166
Chapter 19: Appendices
169
Common Pitfalls and How to Avoid Them
170
Useful Third-Party Libraries (Guava, Apache Commons Collections)
173
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