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Ivor Horton's Beginning Java™ 2, JDK™ 5th Edition by Ivor Horton

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10.4. Buffers

All the classes that define buffers have the abstract Buffer class as a base. The Buffer class therefore defines the fundamental characteristics common to all buffers. A particular buffer can store a sequence of elements of a given type, and an element can be of any primitive data type other than boolean. Thus, you can create buffers to store byte values, char values, short values, int values, long values, float values, or double values. The following classes in the java.nio package define these buffers:

ClassDescription
ByteBufferA buffer that stores values of type byte. You can also store the binary values of any of the other primitive types in this buffer, except for type boolean. Each binary value that you store will occupy a number of bytes in the buffer determined by the type—values of type char or short will occupy 2 bytes, int values will occupy 4 bytes, and so on. Only buffers of this type can be used in a file I/O operation.
CharBufferA buffer that stores only values of type char
ShortBufferA buffer that stores only values of type short
IntBufferA buffer that stores only values of type int
LongBufferA buffer that stores only values of type long
FloatBufferA buffer that stores only values of type float
DoubleBufferA buffer that stores only values of type double

I keep repeating "except for type boolean" every so often, so I had better address that. The various types of buffers provide only for the numerical data types, and type boolean does not fit into this category. ...

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