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IO in java

IO in java. Stream. Character Stream Byte Stream. Character & ByteStream classes. FileWriter FileReader. Buffered Character Stream. BufferedReader BufferedWriter By buffering, no. of reads and writes to the physical device is reduced. BufferedWriter.

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IO in java

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  1. IO in java

  2. Stream • Character Stream • Byte Stream

  3. Character & ByteStream classes

  4. FileWriter • FileReader

  5. Buffered Character Stream • BufferedReader • BufferedWriter By buffering, no. of reads and writes to the physical device is reduced.

  6. BufferedWriter • It buffers output to a character stream. • Constructor: BufferedWriter(Writer w) BufferedWriter(Writer w, intbufsize) Methods: same as Writer void newLine() throwsIOException program

  7. BufferedReader • It buffers input from character stream. • Constructor: BufferedReader(Reader r) BufferedReader (Reader r, intbufsize) Methods: same as Reader void readLine() throwsIOException program

  8. PrintWriter • It displays string equivalents of simple type such as int, float, char, etc.. • Constructor: PrintWriter(OutputStreamos) PrintWriter(OutputStreamos,booleanflushOnNewline) PrintWriter(Writer w) PrintWriter(Writer w, os,booleanflushOnNewline)

  9. Methods: print() println() program:

  10. ByteStream • OutputStream and InputStream class has same methods as FileWriter and FileReader.

  11. FileOutputStream • It allows you to write binary data to a file. • Constructor: FileOutputStream(String filePath) throws IOException FileOutputStream(File obj) throws IOException Program

  12. FileInputStream • It allows you to read binary data from a file. • Constructor: FileInputStream(String filePath) throws FileNotFoundException FileInputStream(File obj) throws FileNotFoundException Program

  13. DataOutputstream Class • It allows to write simple java types to byte output stream. • Constructor: DataOutputStream(OutputStreamos)

  14. Methods • void writeInt(inti) • Void writeBoolean(Boolean b) • Void writeByte(Byte b) • Void writeChar(inti) • Void writeDouble(double d) • Void writeFloat(float f) • Void writeLong(long l) • Void writeShort(short s) • Void writeUTF(String s) • Program

  15. DataInputStream • It allows to read simple java types from byte input stream. • Constructor: DataInputStream(InputStream is)

  16. Methods • byte readByte() • booleanreadBoolean • char readChar() • double readDouble() • float readFloat() • long readLong() • short readShort() • intreadInt() • string readUTF() • Program

  17. BufferedOutputStream • Buffers output to a byte stream. • Constructor: BufferedOutputStream(OutputStreamos) BufferedOutputStream(OutputStreamos, intbufSize) Program:

  18. BufferedInputStream • Buffers input from a byte stream. • Constructor: BufferedInputStream(InputStream is) BufferedInputStream(InputStream is, intbufSize) Program:

  19. Random Access File • Previous classes only use sequential access to read and write to a file. • This class allows to write programs that can seek to any location in a file to read & write data to that point. • Constructor: • RandomAccessFile(String filenm, String mode)

  20. Methods • void close() • long length() • int read() • int read(byte buffer[],int index, int size) • void seek(long n) • intskipByte(int n)

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