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BigDecimal objects are immutable

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If you want to calculate with BigDecimal you have to use the returned value because BigDecimal objects are immutable: 

BigDecimal a = new BigDecimal("42.23");
BigDecimal b = new BigDecimal("10.001");

a.add(b); // a will still be 42.23

BigDecimal c = a.add(b); // c will be 52.231
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BigDecimal:
* BigDecimal
* Comparing BigDecimals
* Using BigDecimal instead of float
* Mathematical operations with BigDecimal
* BigDecimal.valueOf
* Initialization of BigDecimals with value zero one or ten
* BigDecimal objects are immutable
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0 Inheritance
1 Getting started with Java
2 Streams
3 Exceptions
4 Collections
5 Lambda Expressions
6 Generics
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31 Annotations
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34 Calendar and its Subclasses
35 Nashorn JavaScript engine
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37 Remote Method Invocation (RMI)
38 Iterator and Iterable
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48 JSON in Java
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54 Bit Manipulation
55 Java Agents
56 Encapsulation
57 Type Conversion
58 BigInteger
59 BigDecimal
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
71 Java Memory Management
72 Immutable Objects
73 Object Cloning
74 Alternative Collections
75 Lists
76 BufferedWriter
77 LocalTime
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80 JVM Tool Interface
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82 Apache Commons Lang
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84 The Classpath
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86 XML Parsing using JAXP
87 Reference Types
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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
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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
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109 ServiceLoader
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111 Object References
112 Pitfalss - performance
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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
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133 Queues and deques
134 Runtime commands
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137 Java Virtual Machine JVM
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139 JavaBean
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142 Java SE 8 Features
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146 Concurrent Collections
147 Using ThreadPoolExecutor in multi-threaded applications
148 Java Editions, versions, releases and distributions
149 Dynamic method dispatch
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152 Generating Java Code
153 JShell
154 Benchmarks
155 Collection Factory Methods
156 Multi-release JAR files
157 Stack-Walking API
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159 Sockets
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161 Using other scripting languages in Java
162 Functional interfaces
163 List vs. set
164 2D graphics
165 Reflection
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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