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Checking arithmetic with assert

suggest change 
a = 1 - Math.abs(1 - a % 2);

// This will throw an error if my arithmetic above is wrong.
assert a >= 0 && a <= 1 : "Calculated value of " + a + " is outside of expected bounds";

return a;
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Asserting:
* Asserting
* Checking arithmetic with assert
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0 Inheritance
1 Getting started with Java
2 Streams
3 Exceptions
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84 The Classpath
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86 XML Parsing using JAXP
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90 XML XPath Evaluation
91 Performance Tuning
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93 Common Pitfalls
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103 Just in Time JIT compiler
104 FTP File Transfer Protocol
105 Java Native Access JNI
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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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137 Java Virtual Machine JVM
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148 Java Editions, versions, releases and distributions
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152 Generating Java Code
153 JShell
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156 Multi-release JAR files
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161 Using other scripting languages in Java
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169 Local Inner class
170 Java Print Service
171 Immutable class
172 String Tokenizer
173 File upload to S3 / AWS
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176 Enum starting with a number
177 SortedMap
178 WeakHashMap
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180 StringBuffer
181 Choosing Collections
182 C++ Comparison
183 CompletableFuture
184 Contributors