CSE 2231 - Java Input/Output
Java Input/Output
6 May 2019
OSU CSE
1
Overview
? The Java I/O (Input/Output) package java.io contains a group of interfaces and classes similar to the OSU CSE components' SimpleReader and SimpleWriter component families
? Except that java.io is far more general,
configurable, and powerful (and messy) ? Hence, the names SimpleReader and
SimpleWriter
6 May 2019
OSU CSE
2
I/O Streams
? An input/output stream is a (conceptually not necessarily finite) series of data items
? An input stream is a "flow" of data items from a source to a program
? The program reads from the source (or from the stream)
? An output stream is a "flow" of data items from a program to a destination
? The program writes to the destination (or to the stream)
6 May 2019
OSU CSE
3
Input Streams
source
input stream program
single data item
6 May 2019
OSU CSE
4
Input Streams
source
input stream program
single data item
Source may be the keyboard, a file on disk, a physical device, another program, even an array or String
in the same program.
6 May 2019
OSU CSE
5
Output Streams
program output stream
destination
single data item
6 May 2019
OSU CSE
6
6 May 2019
Output Streams
program output stream
destination
single data item
Destination may be the console window, a file on disk, a physical device, another program, even an array or String in the same program.
OSU CSE
7
Part I: Beginner's Guide
? This part is essentially a "how-to" guide for using java.io that assumes knowledge of the OSU CSE components' SimpleReader and SimpleWriter component families
6 May 2019
OSU CSE
8
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