Java in a Nutshell, 5th Edition [Electronic resources]

This class is a subclass of FilterOutputStream that allows you to write Java primitive data types in a portable binary format. Create a DataOutputStream by specifying the OutputStream that is to be filtered in the call to the constructor. DataOutputStream has methods that output only primitive types; use ObjectOutputStream to output object values.

Many of this class''s methods write a single Java primitive type, in binary format, to the output stream. write( ) writes a single byte, an array, or a subarray of bytes. flush( ) forces any buffered data to be output. size( ) returns the number of bytes written so far. writeUTF( ) outputs a Java string of Unicode characters using a slightly modified version of the UTF-8 transformation format. UTF-8 is an ASCII-compatible encoding of Unicode characters that is often used for the transmission and storage of Unicode text. Except for the writeUTF( ) method, this class is used for binary output of data. Textual output should be done with PrintWriter (or PrintStream in Java 1.0).

public class 
DataOutputStream  extends FilterOutputStream implements DataOutput {
// Public Constructors
public 
DataOutputStream (OutputStream 
out );  
// Public Instance Methods
public final int 
size ( );  
// Methods Implementing DataOutput
public void 
write (int 
b ) throws IOException;                 synchronized
public void 
write (byte[ ] 
b , int 
off , int 
len ) throws IOException;     synchronized
public final void 
writeBoolean (boolean 
v ) throws IOException;  
public final void 
writeByte (int 
v ) throws IOException;  
public final void 
writeBytes (String 
s ) throws IOException;  
public final void 
writeChar (int 
v ) throws IOException;  
public final void 
writeChars (String 
s ) throws IOException;  
public final void 
writeDouble (double 
v ) throws IOException;  
public final void 
writeFloat (float 
v ) throws IOException;  
public final void 
writeInt (int 
v ) throws IOException;  
public final void 
writeLong (long 
v ) throws IOException;  
public final void 
writeShort (int 
v ) throws IOException;  
public final void 
writeUTF (String 
str ) throws IOException;  
// Public Methods Overriding FilterOutputStream
public void 
flush ( ) throws IOException;  
// Protected Instance Fields
protected int 
written ;  
}