Java in a Nutshell, 5th Edition

Name

DatagramPacket

Synopsis

This class implements a packet of data that may be sent or received over the network through a DatagramSocket. Create a DatagramPacket to be sent over the network with one of the consructor methods that includes a network address. Create a DatagramPacket into which data can be received using one of the constructors that does not include a network address argument. The receive( ) method of DatagramSocket waits for data and stores it in a DatagramPacket created in this way. The contents and sender of a received packet can be queried with the DatagramPacket instance methods.

New constructors and methods were added to this class in Java 1.4 to support the SocketAddress abstraction of a network address.

public final class DatagramPacket {
// Public Constructors
     public DatagramPacket(byte[ ] buf, int length);  
1.4  public DatagramPacket(byte[ ] buf, int length, SocketAddress address) 
throws SocketException;  
1.2  public DatagramPacket(byte[ ] buf, int offset, int length);  
     public DatagramPacket(byte[ ] buf, int length, InetAddress address, 
     int port);  
1.4  public DatagramPacket(byte[ ] buf, int offset, int length, 
SocketAddress address) throws SocketException;  
1.2  public DatagramPacket(byte[ ] buf, int offset, int length, 
InetAddress address, int port);  
// Public Instance Methods
     public InetAddress getAddress( );               synchronized
     public byte[ ] getData( );               synchronized
     public int getLength( );                  synchronized
                  1.2  public int getOffset( );                    synchronized
     public int getPort ...