The Functional Java library provides the usual set of types for managing data like lists, sets, arrays, and maps . The key thing to realize is that these data types are immutable. Additionally, the library provides convenience functions to convert to and from standard Java Collections classes if needed.
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The primitive Java types (boolean, byte, char, short, int, long, float, and double), and the keyword void are also represented as Class objects . It has no public constructor. Class objects are constructed automatically by the Java Virtual Machine(JVM).
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