Essential Books

Adding Getters and Setters

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Encapsulation is a basic concept in OOP. It is about wrapping data and code as a single unit. In this case, it is a good practice to declare the variables as private and then access them through Getters and Setters to view and/or modify them. 

public class Sample {
  private String  name;
  private int age;

  public int getAge() {
    return age;
  }

  public void setAge(int age) {
    this.age = age;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }
}

These private variables cannot be accessed directly from outside the class. Hence they are protected from unauthorized access. But if you want to view or modify them, you can use Getters and Setters.

getXxx() method will return the current value of the variable xxx, while you can set the value of the variable xxx using setXxx().

The naming convention of the methods are (in example variable is called variableName): 

getVariableName()   //Getter, The variable name should start with uppercase
setVariableName(..) //Setter, The variable name should start with uppercase
isVariableName()     //Getter, The variable name should start with uppercase
setVariableName(...) //Setter, The variable name should start with uppercase

Public Getters and Setters are part of the Property definition of a Java Bean.

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Getters and Setter:
* Getters and Setters
* Using a setter or getter to implement a constraint
* Adding Getters and Setters
* Why Use Getters and Setters
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0 Inheritance
1 Getting started with Java
2 Streams
3 Exceptions
4 Collections
5 Lambda Expressions
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7 File I/O
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13 Default Methods
14 Classes and Objects
15 Basic Control structures
16 Concurrent Programming Threads
17 Console I/O
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19 Visibility controlling access to members of a class
20 Regular Expressions
21 Autoboxing
22 Documenting Java Code
23 Executor, ExecutorService and Thread pools
24 Object Class Methods and Constructor
25 JAXB
26 Primitive Data Types
27 Networking
28 Optional
29 Enums
30 HttpURLConnection
31 Annotations
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34 Calendar and its Subclasses
35 Nashorn JavaScript engine
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38 Iterator and Iterable
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55 Java Agents
56 Encapsulation
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58 BigInteger
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60 RSA Encryption
61 Varargs Variable Arguments
62 ThreadLocal
63 Logging
64 static keyword
65 Disassembling and Decompling
66 Resources on classpath
67 log4j, log4j2
68 JVM Flags
69 Oracle Official Code Standard
70 Character encoding
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73 Object Cloning
74 Alternative Collections
75 Lists
76 BufferedWriter
77 LocalTime
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79 Comparable and Comparator
80 JVM Tool Interface
81 Nested and Inner Classes
82 Apache Commons Lang
83 Getters and Setter
84 The Classpath
85 Bytecode Modification
86 XML Parsing using JAXP
87 Reference Types
88 Localization and Internationalization
89 JAX-WS
90 XML XPath Evaluation
91 Performance Tuning
92 Parallel programming with ForkJoin framework
93 Common Pitfalls
94 Non-Access Modifiers
95 Java Compiler
96 XJC
97 Installing Java Standard Edition
98 Process
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100 Dates and Time using java.time
101 Fluent Interface
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103 Just in Time JIT compiler
104 FTP File Transfer Protocol
105 Java Native Access JNI
106 Modules
107 Pitfalls - exceptions
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109 ServiceLoader
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111 Object References
112 Pitfalss - performance
113 Creating Images Programmatically
114 Applets
115 NIO Networking
116 New File I/O
117 Secure objects
118 Pitfalls - threads and concurrency
119 Splitting a string into fixed length parts
120 Pitfalls - nulls and NullPointerException
121 SecurityManager
122 JNDI
123 super keyword
124 java.util.Objects class
125 Java command: java and javaw
126 Atomic types
127 Floating Point Operations
128 Converting to and from strings
129 sun.misc.Unsafe
130 Java Memory Model
131 Java deployment
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133 Queues and deques
134 Runtime commands
135 NumberFormat
136 Security and Cryptograhy
137 Java Virtual Machine JVM
138 Unit Testing
139 JavaBean
140 Expressions
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142 Java SE 8 Features
143 Java SE 7 Features
144 Packages
145 Concurrency and Money
146 Concurrent Collections
147 Using ThreadPoolExecutor in multi-threaded applications
148 Java Editions, versions, releases and distributions
149 Dynamic method dispatch
150 JMX
151 Security and cryptography
152 Generating Java Code
153 JShell
154 Benchmarks
155 Collection Factory Methods
156 Multi-release JAR files
157 Stack-Walking API
158 TreeMap and TreeSet
159 Sockets
160 Java Sockets
161 Using other scripting languages in Java
162 Functional interfaces
163 List vs. set
164 2D graphics
165 Reflection
166 Deque interface
167 Enum Map
168 EnumSet class
169 Local Inner class
170 Java Print Service
171 Immutable class
172 String Tokenizer
173 File upload to S3 / AWS
174 Readers and writers
175 Hashtable
176 Enum starting with a number
177 SortedMap
178 WeakHashMap
179 LinkedHashMap
180 StringBuffer
181 Choosing Collections
182 C++ Comparison
183 CompletableFuture
184 Contributors