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Use the Builder pattern's \[[Gamma 95|AA. Java References#Gamma 95]\] variant suggested by Bloch \[[Bloch 08|AA. Java References#Bloch 08]\] to ensure thread safety and atomicity of object creation. The idea is to call the constructor with the _required_ parameters and obtain a _builder_ object. Each _optional_ parameter can be set using setters on the builder. The object construction concludes with the invocation of the {{build()}} method. The class {{Currency}} also becomes immutable as a result. |
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