Binary IO
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2022-07-13 12:28:42
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FileInputStream
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2 Constructors
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public FileInputStream ( String filename)
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public FileInputStream ( File file)
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FileOutputStream
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4 Constructors
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public FileOutputStream ( String filename)
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public FileOutputStream ( File file)
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public FileOutputStream ( String filename, Boolean append)
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public FileOutputStream ( File file, Boolean append)
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DataInputStream
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Constructor
public DataInputStream ( InputStream instream)
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Example:
DataInputStream infile = new DataInputStream ( new FileInputStream ( "in.dat" ) ) ;
infile.readBoolean ( ) ;
infile.readByte ( ) ;
infile.readBytes ( ) ; // Read lower byte of characters
infile.readChar ( ) ;
infile.readChars ( ) ; // Read every character
infile.readFloat ( ) ;
infile.readDouble ( ) ;
infile.readInt ( ) ;
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DataOutputStream
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Constructor
public DataOutputStream ( OutputStream outstream)
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Example:
DataOutputStream outfile = new DataOutputStream ( new FileOutputStream ( "out.dat" ) ) ;
outfile.writeBoolean ( boolTmp) ;
outfile.writeByte ( intTmp) ;
outfile.writeBytes ( strTmp) ; // Write lower byte of characters
outfile.writeChar ( charTmp) ;
outfile.writeChars ( strTmp) ; // Write every character
outfile.writeFloat ( floatTmp) ;
outfile.writeDouble ( dblTmp) ;
outfile.writeInt ( intTmp) ;
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BufferedInputStream/ BufferedOutputStream
- Using buffers to speed up I/O
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Constructor
public BufferedInputStream ( InputStream in)
public BufferedInputStream ( InputStream in, int bufferSize) -
Constructor
public BufferedOutputStream ( OutputStream out)
public BufferedOutputStream ( OutputStreamr out, int bufferSize)
ObjectInputStream/ ObjectOutputStream
- Enables to perform I/O for
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Constructor
public ObjectInputStream ( InputStream in)
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Constructor
public ObjectOutputStream ( OutputStream out)
RandomAccessFile
- to allow a file to be read from and write to at random locations
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Constructor
// Allow read and write
RandomAccessFile raf = new RandomAccessFile ( "test.dat" , "rw" ) ;
// Read only
RandomAccessFile raf = new RandomAccessFile ( "test.dat" , "r" ) ; -
Example
RandomAccessFile inout = new RandomAccessFile ( "test.dat" , "rw" ) ;
// Clear the file to destroy the old contents if exists
inout.setLength ( 0 ) ;
// Write new integers to the file
for ( int i = 0 ; i < 200 ; i++ )
inout.writeInt ( i) ;
System .out .println ( inout.length ( ) ) ; // length of the file
inout.seek ( 0 ) ; // Move the file pointer to the beginning
System .out .println ( inout.readInt ( ) ) ;
inout.seek ( 1 * 4 ) ; // Move the file pointer to the 2nd number
System .out .println ( inout.readInt ( ) ) ;
// Close file
inout.close ( ) ;
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