Chapter 2.1 : Data Stream
- 1. Data Stream “Stream is a process to read a data from 1 resource or send a data to another location.”
- 2. What is Stream • All data in JAVA platform was read and write by Stream • Stream is a process to read a data from 1 resource and send a data to another location. • Example : – Read and write file at and to Harddisk – Read and write text to console – Read and write to network • Stream has 2 type : – Stream Byte (8bit): File for binary data – Stream Character (16bit) : File for Unicode data
- 4. Byte Stream
- 5. Java.io Hierarchy • Package java.io was develop to make easy for user to do an various type for input or output process such as Objects, Strings and Bytes. • It also design in order to receive input and output from various source such as keyboard, network and disk.
- 6. I/O Stream • To READ, a program will open STREAM at a resource (file, memory, socket) and READ an information in sequential. • And to WRITE, a program will send an information to a destination. It will open a STREAM and it will WRITE an information in sequential • hhhhhhhhhhhhh
- 7. Reader and Writer • Use for READ and WRITE text data • It more easy then InputStream and OutputStream • For fast performance, use a buffering facility, Example : BufferedReader.
- 8. Reader • To READ a text by paragraph, use below technique : – File f = new Fine (“C:OOPMyText.txt”); – FileReader fr = mew FileReader(f); – BufferedReader fin = new BufferedReader(fr); • FileReader is a lane that provide to read a File. • BufferedReader wrap a FileReader in order to make input process using buffering technique.
- 10. Input DataStream
- 11. Reader vs Writer • Reader – BufferedReader – CharArrayReader – FilterReader – InputStreamReader – FileReader – PipedReader – StringReader • Writer – BufferedWriter – CharArrayWriter – FilterWriter – OutputStreamWriter – FileWriter – PipedWriter – StringWriter – PrintWriter
- 12. Reader • After BufferedReader formed, String will be taken with a readLine() method that use to return a String value. • To display a data it will use print() or println().
- 13. Writer • Use to WRITE a text line by line use following technique : – File f = new File (“C:OOPMyText.txt”); – FileWriter fw = new FileWriter(f); – PrintWriter fin = new PrintWriter(fw); • A file will be process to be FileWriter that is needed for output. • PrintWriter is needed in order to make program can use a print() and println() method.
- 14. Output Stream
- 16. Stream Byte • Actually stream byte divide by 2 class : InputStream and OutputStream • InputStream and OutStream is a higher level in java.io package.
- 17. Stream Byte • InputStream and OutStream is a class for stream I/O that use to READ and WRITE a data from and to file. • For READ a file, we use : FileInputStream • For WRITE a file, we use : FileOutputStream
- 19. How to use a byte stream? INPUT STREAM OUTPUT STREAM Create object that oriented with source data. Eg : FileInputStream Create object that oriented with destination data. Eg : BufferedWriter Read information from stream by using object method. Eg : read() Write an information to stream by using object method. Eg : write() When complete, close method will be call. When complete, closure method will be call.