The Java I/O System
The Java I/O System
? Binary I/O streams (ascii, 8 bits)
?
?
InputStream
OutputStream
? The decorator design pattern
? Character I/O streams (Unicode, 16 bits)
?
?
Reader
Writer
? Comparing Binary I/O to Character I/O
? Files and directories
?
The class File
? Object Serialization
?
Light-weight persistence
? Will only look at the package java.io not java.nio.
OOP: The Java I/O System
1
Overview of The Java I/O System
? Goal: To provide an abstraction of all types of I/O
?
?
?
?
Memory
File
Directory
Network
? Express all configurations
?
Character, binary, buffered, etc.
? Different kinds of operations
?
Sequential, random access, by line, by word, etc.
OOP: The Java I/O System
2
The Stream Concept
? A stream is a sequential source of information used to transfer
information from one source to another.
OOP: The Java I/O System
[Source: java.]
3
Streams in Java
? There is a huge (and complicated) hierarchy of stream classes in
Java.
? Overview of the stream hierarchy
?
?
?
?
Reader, root in unicode input hierarchy
Writer, root in unicode output hierarchy
InputStream, root in binary input hierarchy
OutputStream, root in binary output hierarchy
? All abstract classes.
OOP: The Java I/O System
4
The Decorator Design Pattern
? Wrap classes in ¡°decorators¡± to add functionality.
Component
operation()
component
ConcretComponent
operation()
Decorator
operation()
ConcreteDecorator1
operation()
addState
OOP: The Java I/O System
//addOpr();
component.operation()
ConcreteDecorator2
operation()
addOpr()
5
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