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I/O In Java Part 2

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ashishspace

The document discusses file input/output (IO) in Java. It provides an overview of IO classes for input and output streams, readers and writers. It then describes the key methods of various IO classes like OutputStream, InputStream, Writer, and Reader. These include methods for writing bytes/characters to output streams/writers, reading bytes/characters from input streams/readers, marking and resetting streams, and closing streams. The document is intended as teaching material for a class on Java file IO.

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File IO in Java Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 September 21, 2012 Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 1
AGENDA Overview of IO Classes OutputStream of IO InputStream of IO Writer of IO Reader of IO Methods of OutputStream Class Methods of Writer Class Methods of Writer Class Extra Methods of InputStream Class Methods of Reader Class InputStream Usage OutputStream Usage Bridge Classes OutputStreamWriter InputStream Reader FileInput and FileOutput Stream Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 2
Overview of IO Classes Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 3
OutputStream of IO Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 4
InputStream of IO Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 5
Writer of IO Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 6
Reader of IO Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 7
Methods of OutputStream Class public void write(int b) Writes a single byte to an output stream. Why we need int as argument? Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 8
Methods of OutputStream Class public void write(int b) Writes a single byte to an output stream. Why we need int as argument? public void write(byte[] b) Writes complete byte array in to an outputstream. Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 9
Methods of OutputStream Class public void write(int b) Writes a single byte to an output stream. Why we need int as argument? public void write(byte[] b) Writes complete byte array in to an outputstream. public void write(byte[] b, int offset, int len) Write a subrange from offset to specified length[number of bytes]. Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 10
Methods of OutputStream Class public void write(int b) Writes a single byte to an output stream. Why we need int as argument? public void write(byte[] b) Writes complete byte array in to an outputstream. public void write(byte[] b, int offset, int len) Write a subrange from offset to specified length[number of bytes]. public void flush() Flushes the output buffer. Ensures the contents are written to the destination. Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 11
Methods of OutputStream Class public void write(int b) Writes a single byte to an output stream. Why we need int as argument? public void write(byte[] b) Writes complete byte array in to an outputstream. public void write(byte[] b, int offset, int len) Write a subrange from offset to specified length[number of bytes]. public void flush() Flushes the output buffer. Ensures the contents are written to the destination. public void close() Closes the outputstream. Further write will generate IOException Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 12
Methods of Writer Class public void write(int ch) Writes a single character to an output stream. Why we need int as argument? Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 13
Methods of Writer Class public void write(int ch) Writes a single character to an output stream. Why we need int as argument? public void write(char[] ch) Writes complete character array in to an outputstream. Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 14
Methods of Writer Class public void write(int ch) Writes a single character to an output stream. Why we need int as argument? public void write(char[] ch) Writes complete character array in to an outputstream. public void write(char[] b, int offset, int len) Write a subrange from offset to specified length[number of character]. Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 15
Methods of Writer Class public void write(int ch) Writes a single character to an output stream. Why we need int as argument? public void write(char[] ch) Writes complete character array in to an outputstream. public void write(char[] b, int offset, int len) Write a subrange from offset to specified length[number of character]. public void flush() Flushes the output buffer. Ensures the contents are written to the destination. Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 16
Methods of Writer Class public void write(int ch) Writes a single character to an output stream. Why we need int as argument? public void write(char[] ch) Writes complete character array in to an outputstream. public void write(char[] b, int offset, int len) Write a subrange from offset to specified length[number of character]. public void flush() Flushes the output buffer. Ensures the contents are written to the destination. public void close() Closes the writer. Further write will generate IOException Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 17
Methods of Writer Class Extra String is a sequence of Character. public void write(String s) Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 18
Methods of Writer Class Extra String is a sequence of Character. public void write(String s) public void write(String s, int offset, int len) Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 19
Methods of Writer Class Extra String is a sequence of Character. public void write(String s) public void write(String s, int offset, int len) public void append(char ch) Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 20
Methods of Writer Class Extra String is a sequence of Character. public void write(String s) public void write(String s, int offset, int len) public void append(char ch) public void append(CharSequence cs) Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 21
Methods of Writer Class Extra String is a sequence of Character. public void write(String s) public void write(String s, int offset, int len) public void append(char ch) public void append(CharSequence cs) public void append(CharSequence cs, int offset, int len) Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 22
Methods of InputStream Class public int read() Read the integer representation of the next available byte of input. Returns -1 when the end of file is encountered. Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 23
Methods of InputStream Class public int read() Read the integer representation of the next available byte of input. Returns -1 when the end of file is encountered. public int read(byte[] b) Attempt to read up to b.length bytes in the the b array. Returns the number of actual bytes read. -1 is returned when the end of file is encountered. Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 24
Methods of InputStream Class public int read() Read the integer representation of the next available byte of input. Returns -1 when the end of file is encountered. public int read(byte[] b) Attempt to read up to b.length bytes in the the b array. Returns the number of actual bytes read. -1 is returned when the end of file is encountered. public int read(byte[] b, int offset, int len) Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 25
Methods of InputStream Class public int read() Read the integer representation of the next available byte of input. Returns -1 when the end of file is encountered. public int read(byte[] b) Attempt to read up to b.length bytes in the the b array. Returns the number of actual bytes read. -1 is returned when the end of file is encountered. public int read(byte[] b, int offset, int len) public long skip(long count) count indicates number of bytes to be skipped and return the number of byte skipped or -1 in case of end of file. Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 26
Methods of InputStream Class public int read() Read the integer representation of the next available byte of input. Returns -1 when the end of file is encountered. public int read(byte[] b) Attempt to read up to b.length bytes in the the b array. Returns the number of actual bytes read. -1 is returned when the end of file is encountered. public int read(byte[] b, int offset, int len) public long skip(long count) count indicates number of bytes to be skipped and return the number of byte skipped or -1 in case of end of file. public int available() Number of bytes available for reading. Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 27
Methods of InputStream Class public int read() Read the integer representation of the next available byte of input. Returns -1 when the end of file is encountered. public int read(byte[] b) Attempt to read up to b.length bytes in the the b array. Returns the number of actual bytes read. -1 is returned when the end of file is encountered. public int read(byte[] b, int offset, int len) public long skip(long count) count indicates number of bytes to be skipped and return the number of byte skipped or -1 in case of end of file. public int available() Number of bytes available for reading. public void mark(int readlimit) Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 28
Methods of InputStream Class public int read() Read the integer representation of the next available byte of input. Returns -1 when the end of file is encountered. public int read(byte[] b) Attempt to read up to b.length bytes in the the b array. Returns the number of actual bytes read. -1 is returned when the end of file is encountered. public int read(byte[] b, int offset, int len) public long skip(long count) count indicates number of bytes to be skipped and return the number of byte skipped or -1 in case of end of file. public int available() Number of bytes available for reading. public void mark(int readlimit) public void reset() Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 29
Methods of InputStream Class public int read() Read the integer representation of the next available byte of input. Returns -1 when the end of file is encountered. public int read(byte[] b) Attempt to read up to b.length bytes in the the b array. Returns the number of actual bytes read. -1 is returned when the end of file is encountered. public int read(byte[] b, int offset, int len) public long skip(long count) count indicates number of bytes to be skipped and return the number of byte skipped or -1 in case of end of file. public int available() Number of bytes available for reading. public void mark(int readlimit) public void reset() public boolean markSupported() Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 30
Methods of InputStream Class public int read() Read the integer representation of the next available byte of input. Returns -1 when the end of file is encountered. public int read(byte[] b) Attempt to read up to b.length bytes in the the b array. Returns the number of actual bytes read. -1 is returned when the end of file is encountered. public int read(byte[] b, int offset, int len) public long skip(long count) count indicates number of bytes to be skipped and return the number of byte skipped or -1 in case of end of file. public int available() Number of bytes available for reading. public void mark(int readlimit) public void reset() public boolean markSupported() public void close() Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 31
Methods of Reader Class public int read() Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 32
Methods of Reader Class public int read() public int read(char[] b) Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 33
Methods of Reader Class public int read() public int read(char[] b) public int read(char[] b, int offset, int len) Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 34
Methods of Reader Class public int read() public int read(char[] b) public int read(char[] b, int offset, int len) public long skip(long count) Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 35
Methods of Reader Class public int read() public int read(char[] b) public int read(char[] b, int offset, int len) public long skip(long count) public boolean ready() Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 36
Methods of Reader Class public int read() public int read(char[] b) public int read(char[] b, int offset, int len) public long skip(long count) public boolean ready() public void mark(int readlimit) Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 37
Methods of Reader Class public int read() public int read(char[] b) public int read(char[] b, int offset, int len) public long skip(long count) public boolean ready() public void mark(int readlimit) public void reset() Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 38
Methods of Reader Class public int read() public int read(char[] b) public int read(char[] b, int offset, int len) public long skip(long count) public boolean ready() public void mark(int readlimit) public void reset() public boolean markSupported() Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 39
Methods of Reader Class public int read() public int read(char[] b) public int read(char[] b, int offset, int len) public long skip(long count) public boolean ready() public void mark(int readlimit) public void reset() public boolean markSupported() public void close() Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 40
InputStream Usage Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 41
OutputStream Usage Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 42
Bridge Classes OutputStreamWriter and InputStreamReader Character Base Stream Classes which inturns work on bytes. Handles unicode character and bytes both. Encoding and Decoding of unicode character from and to various character set. java.nio.charset package has classes which handle encoding and decoding. class Charset represents different character set. Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 43
OutputStreamWriter Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 44
InputStream Reader Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 45
FileInput and FileOutput Stream Output and input of binary files. Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 46
FileInput and FileOutput Stream Output and input of binary files. FileOutputStream create and write bytes in to physical file. Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 47
FileInput and FileOutput Stream Output and input of binary files. FileOutputStream create and write bytes in to physical file. If file exists it overwrites it until append flag is used. Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 48
FileInput and FileOutput Stream Output and input of binary files. FileOutputStream create and write bytes in to physical file. If file exists it overwrites it until append flag is used. Inherits all the methods from the OutputStream. Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 49
FileInput and FileOutput Stream Output and input of binary files. FileOutputStream create and write bytes in to physical file. If file exists it overwrites it until append flag is used. Inherits all the methods from the OutputStream. Additional methods are public FileDescriptor getFD() public FileChannel getChannel() Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 50
FileDescriptor Whenever any file is opened for input or output, it uses a file descriptor. Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 51
FileDescriptor Whenever any file is opened for input or output, it uses a file descriptor. 0=Standard Input Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 52
FileDescriptor Whenever any file is opened for input or output, it uses a file descriptor. 0=Standard Input 1=Standard Output Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 53
FileDescriptor Whenever any file is opened for input or output, it uses a file descriptor. 0=Standard Input 1=Standard Output 2=Standard Error Prof. AshishSingh Bhatia, ast.bhatia@gmail.com, ashish@asbspace.in, Web: asbspace.in, M:9879009551 54

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I/O In Java Part 2

  • 1. File IO in Java Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 September 21, 2012 Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 1
  • 2. AGENDA Overview of IO Classes OutputStream of IO InputStream of IO Writer of IO Reader of IO Methods of OutputStream Class Methods of Writer Class Methods of Writer Class Extra Methods of InputStream Class Methods of Reader Class InputStream Usage OutputStream Usage Bridge Classes OutputStreamWriter InputStream Reader FileInput and FileOutput Stream Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 2
  • 3. Overview of IO Classes Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 3
  • 4. OutputStream of IO Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 4
  • 5. InputStream of IO Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 5
  • 6. Writer of IO Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 6
  • 7. Reader of IO Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 7
  • 8. Methods of OutputStream Class public void write(int b) Writes a single byte to an output stream. Why we need int as argument? Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 8
  • 9. Methods of OutputStream Class public void write(int b) Writes a single byte to an output stream. Why we need int as argument? public void write(byte[] b) Writes complete byte array in to an outputstream. Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 9
  • 10. Methods of OutputStream Class public void write(int b) Writes a single byte to an output stream. Why we need int as argument? public void write(byte[] b) Writes complete byte array in to an outputstream. public void write(byte[] b, int offset, int len) Write a subrange from offset to specified length[number of bytes]. Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 10
  • 11. Methods of OutputStream Class public void write(int b) Writes a single byte to an output stream. Why we need int as argument? public void write(byte[] b) Writes complete byte array in to an outputstream. public void write(byte[] b, int offset, int len) Write a subrange from offset to specified length[number of bytes]. public void flush() Flushes the output buffer. Ensures the contents are written to the destination. Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 11
  • 12. Methods of OutputStream Class public void write(int b) Writes a single byte to an output stream. Why we need int as argument? public void write(byte[] b) Writes complete byte array in to an outputstream. public void write(byte[] b, int offset, int len) Write a subrange from offset to specified length[number of bytes]. public void flush() Flushes the output buffer. Ensures the contents are written to the destination. public void close() Closes the outputstream. Further write will generate IOException Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 12
  • 13. Methods of Writer Class public void write(int ch) Writes a single character to an output stream. Why we need int as argument? Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 13
  • 14. Methods of Writer Class public void write(int ch) Writes a single character to an output stream. Why we need int as argument? public void write(char[] ch) Writes complete character array in to an outputstream. Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 14
  • 15. Methods of Writer Class public void write(int ch) Writes a single character to an output stream. Why we need int as argument? public void write(char[] ch) Writes complete character array in to an outputstream. public void write(char[] b, int offset, int len) Write a subrange from offset to specified length[number of character]. Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 15
  • 16. Methods of Writer Class public void write(int ch) Writes a single character to an output stream. Why we need int as argument? public void write(char[] ch) Writes complete character array in to an outputstream. public void write(char[] b, int offset, int len) Write a subrange from offset to specified length[number of character]. public void flush() Flushes the output buffer. Ensures the contents are written to the destination. Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 16
  • 17. Methods of Writer Class public void write(int ch) Writes a single character to an output stream. Why we need int as argument? public void write(char[] ch) Writes complete character array in to an outputstream. public void write(char[] b, int offset, int len) Write a subrange from offset to specified length[number of character]. public void flush() Flushes the output buffer. Ensures the contents are written to the destination. public void close() Closes the writer. Further write will generate IOException Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 17
  • 18. Methods of Writer Class Extra String is a sequence of Character. public void write(String s) Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 18
  • 19. Methods of Writer Class Extra String is a sequence of Character. public void write(String s) public void write(String s, int offset, int len) Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 19
  • 20. Methods of Writer Class Extra String is a sequence of Character. public void write(String s) public void write(String s, int offset, int len) public void append(char ch) Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 20
  • 21. Methods of Writer Class Extra String is a sequence of Character. public void write(String s) public void write(String s, int offset, int len) public void append(char ch) public void append(CharSequence cs) Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 21
  • 22. Methods of Writer Class Extra String is a sequence of Character. public void write(String s) public void write(String s, int offset, int len) public void append(char ch) public void append(CharSequence cs) public void append(CharSequence cs, int offset, int len) Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 22
  • 23. Methods of InputStream Class public int read() Read the integer representation of the next available byte of input. Returns -1 when the end of file is encountered. Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 23
  • 24. Methods of InputStream Class public int read() Read the integer representation of the next available byte of input. Returns -1 when the end of file is encountered. public int read(byte[] b) Attempt to read up to b.length bytes in the the b array. Returns the number of actual bytes read. -1 is returned when the end of file is encountered. Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 24
  • 25. Methods of InputStream Class public int read() Read the integer representation of the next available byte of input. Returns -1 when the end of file is encountered. public int read(byte[] b) Attempt to read up to b.length bytes in the the b array. Returns the number of actual bytes read. -1 is returned when the end of file is encountered. public int read(byte[] b, int offset, int len) Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 25
  • 26. Methods of InputStream Class public int read() Read the integer representation of the next available byte of input. Returns -1 when the end of file is encountered. public int read(byte[] b) Attempt to read up to b.length bytes in the the b array. Returns the number of actual bytes read. -1 is returned when the end of file is encountered. public int read(byte[] b, int offset, int len) public long skip(long count) count indicates number of bytes to be skipped and return the number of byte skipped or -1 in case of end of file. Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 26
  • 27. Methods of InputStream Class public int read() Read the integer representation of the next available byte of input. Returns -1 when the end of file is encountered. public int read(byte[] b) Attempt to read up to b.length bytes in the the b array. Returns the number of actual bytes read. -1 is returned when the end of file is encountered. public int read(byte[] b, int offset, int len) public long skip(long count) count indicates number of bytes to be skipped and return the number of byte skipped or -1 in case of end of file. public int available() Number of bytes available for reading. Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 27
  • 28. Methods of InputStream Class public int read() Read the integer representation of the next available byte of input. Returns -1 when the end of file is encountered. public int read(byte[] b) Attempt to read up to b.length bytes in the the b array. Returns the number of actual bytes read. -1 is returned when the end of file is encountered. public int read(byte[] b, int offset, int len) public long skip(long count) count indicates number of bytes to be skipped and return the number of byte skipped or -1 in case of end of file. public int available() Number of bytes available for reading. public void mark(int readlimit) Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 28
  • 29. Methods of InputStream Class public int read() Read the integer representation of the next available byte of input. Returns -1 when the end of file is encountered. public int read(byte[] b) Attempt to read up to b.length bytes in the the b array. Returns the number of actual bytes read. -1 is returned when the end of file is encountered. public int read(byte[] b, int offset, int len) public long skip(long count) count indicates number of bytes to be skipped and return the number of byte skipped or -1 in case of end of file. public int available() Number of bytes available for reading. public void mark(int readlimit) public void reset() Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 29
  • 30. Methods of InputStream Class public int read() Read the integer representation of the next available byte of input. Returns -1 when the end of file is encountered. public int read(byte[] b) Attempt to read up to b.length bytes in the the b array. Returns the number of actual bytes read. -1 is returned when the end of file is encountered. public int read(byte[] b, int offset, int len) public long skip(long count) count indicates number of bytes to be skipped and return the number of byte skipped or -1 in case of end of file. public int available() Number of bytes available for reading. public void mark(int readlimit) public void reset() public boolean markSupported() Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 30
  • 31. Methods of InputStream Class public int read() Read the integer representation of the next available byte of input. Returns -1 when the end of file is encountered. public int read(byte[] b) Attempt to read up to b.length bytes in the the b array. Returns the number of actual bytes read. -1 is returned when the end of file is encountered. public int read(byte[] b, int offset, int len) public long skip(long count) count indicates number of bytes to be skipped and return the number of byte skipped or -1 in case of end of file. public int available() Number of bytes available for reading. public void mark(int readlimit) public void reset() public boolean markSupported() public void close() Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 31
  • 32. Methods of Reader Class public int read() Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 32
  • 33. Methods of Reader Class public int read() public int read(char[] b) Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 33
  • 34. Methods of Reader Class public int read() public int read(char[] b) public int read(char[] b, int offset, int len) Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 34
  • 35. Methods of Reader Class public int read() public int read(char[] b) public int read(char[] b, int offset, int len) public long skip(long count) Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 35
  • 36. Methods of Reader Class public int read() public int read(char[] b) public int read(char[] b, int offset, int len) public long skip(long count) public boolean ready() Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 36
  • 37. Methods of Reader Class public int read() public int read(char[] b) public int read(char[] b, int offset, int len) public long skip(long count) public boolean ready() public void mark(int readlimit) Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 37
  • 38. Methods of Reader Class public int read() public int read(char[] b) public int read(char[] b, int offset, int len) public long skip(long count) public boolean ready() public void mark(int readlimit) public void reset() Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 38
  • 39. Methods of Reader Class public int read() public int read(char[] b) public int read(char[] b, int offset, int len) public long skip(long count) public boolean ready() public void mark(int readlimit) public void reset() public boolean markSupported() Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 39
  • 40. Methods of Reader Class public int read() public int read(char[] b) public int read(char[] b, int offset, int len) public long skip(long count) public boolean ready() public void mark(int readlimit) public void reset() public boolean markSupported() public void close() Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 40
  • 41. InputStream Usage Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 41
  • 42. OutputStream Usage Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 42
  • 43. Bridge Classes OutputStreamWriter and InputStreamReader Character Base Stream Classes which inturns work on bytes. Handles unicode character and bytes both. Encoding and Decoding of unicode character from and to various character set. java.nio.charset package has classes which handle encoding and decoding. class Charset represents different character set. Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 43
  • 44. OutputStreamWriter Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 44
  • 45. InputStream Reader Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 45
  • 46. FileInput and FileOutput Stream Output and input of binary files. Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 46
  • 47. FileInput and FileOutput Stream Output and input of binary files. FileOutputStream create and write bytes in to physical file. Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 47
  • 48. FileInput and FileOutput Stream Output and input of binary files. FileOutputStream create and write bytes in to physical file. If file exists it overwrites it until append flag is used. Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 48
  • 49. FileInput and FileOutput Stream Output and input of binary files. FileOutputStream create and write bytes in to physical file. If file exists it overwrites it until append flag is used. Inherits all the methods from the OutputStream. Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 49
  • 50. FileInput and FileOutput Stream Output and input of binary files. FileOutputStream create and write bytes in to physical file. If file exists it overwrites it until append flag is used. Inherits all the methods from the OutputStream. Additional methods are public FileDescriptor getFD() public FileChannel getChannel() Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 50
  • 51. FileDescriptor Whenever any file is opened for input or output, it uses a file descriptor. Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 51
  • 52. FileDescriptor Whenever any file is opened for input or output, it uses a file descriptor. 0=Standard Input Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 52
  • 53. FileDescriptor Whenever any file is opened for input or output, it uses a file descriptor. 0=Standard Input 1=Standard Output Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 53
  • 54. FileDescriptor Whenever any file is opened for input or output, it uses a file descriptor. 0=Standard Input 1=Standard Output 2=Standard Error Prof. AshishSingh Bhatia, [email protected], [email protected], Web: asbspace.in, M:9879009551 54