- java.lang.Object
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- java.net.DatagramSocket
 
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- All Implemented Interfaces:
- Closeable,- AutoCloseable
 - Direct Known Subclasses:
- MulticastSocket
 
 public class DatagramSocket extends Object implements Closeable This class represents a socket for sending and receiving datagram packets.A datagram socket is the sending or receiving point for a packet delivery service. Each packet sent or received on a datagram socket is individually addressed and routed. Multiple packets sent from one machine to another may be routed differently, and may arrive in any order. Where possible, a newly constructed DatagramSockethas theSO_BROADCASTsocket option enabled so as to allow the transmission of broadcast datagrams. In order to receive broadcast packets a DatagramSocket should be bound to the wildcard address. In some implementations, broadcast packets may also be received when a DatagramSocket is bound to a more specific address.Example: DatagramSocket s = new DatagramSocket(null); s.bind(new InetSocketAddress(8888));Which is equivalent to:DatagramSocket s = new DatagramSocket(8888);Both cases will create a DatagramSocket able to receive broadcasts on UDP port 8888.- Since:
- 1.0
- See Also:
- DatagramPacket,- DatagramChannel
 
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Constructor SummaryConstructors Modifier Constructor Description DatagramSocket()Constructs a datagram socket and binds it to any available port on the local host machine.DatagramSocket(int port)Constructs a datagram socket and binds it to the specified port on the local host machine.DatagramSocket(int port, InetAddress laddr)Creates a datagram socket, bound to the specified local address.protectedDatagramSocket(DatagramSocketImpl impl)Creates an unbound datagram socket with the specified DatagramSocketImpl.DatagramSocket(SocketAddress bindaddr)Creates a datagram socket, bound to the specified local socket address.
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Method SummaryAll Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description voidbind(SocketAddress addr)Binds this DatagramSocket to a specific address and port.voidclose()Closes this datagram socket.voidconnect(InetAddress address, int port)Connects the socket to a remote address for this socket.voidconnect(SocketAddress addr)Connects this socket to a remote socket address (IP address + port number).voiddisconnect()Disconnects the socket.booleangetBroadcast()Tests if SO_BROADCAST is enabled.DatagramChannelgetChannel()Returns the uniqueDatagramChannelobject associated with this datagram socket, if any.InetAddressgetInetAddress()Returns the address to which this socket is connected.InetAddressgetLocalAddress()Gets the local address to which the socket is bound.intgetLocalPort()Returns the port number on the local host to which this socket is bound.SocketAddressgetLocalSocketAddress()Returns the address of the endpoint this socket is bound to.<T> TgetOption(SocketOption<T> name)Returns the value of a socket option.intgetPort()Returns the port number to which this socket is connected.intgetReceiveBufferSize()Get value of the SO_RCVBUF option for thisDatagramSocket, that is the buffer size used by the platform for input on thisDatagramSocket.SocketAddressgetRemoteSocketAddress()Returns the address of the endpoint this socket is connected to, ornullif it is unconnected.booleangetReuseAddress()Tests if SO_REUSEADDR is enabled.intgetSendBufferSize()Get value of the SO_SNDBUF option for thisDatagramSocket, that is the buffer size used by the platform for output on thisDatagramSocket.intgetSoTimeout()Retrieve setting for SO_TIMEOUT. 0 returns implies that the option is disabled (i.e., timeout of infinity).intgetTrafficClass()Gets traffic class or type-of-service in the IP datagram header for packets sent from this DatagramSocket.booleanisBound()Returns the binding state of the socket.booleanisClosed()Returns whether the socket is closed or not.booleanisConnected()Returns the connection state of the socket.voidreceive(DatagramPacket p)Receives a datagram packet from this socket.voidsend(DatagramPacket p)Sends a datagram packet from this socket.voidsetBroadcast(boolean on)Enable/disable SO_BROADCAST.static voidsetDatagramSocketImplFactory(DatagramSocketImplFactory fac)Sets the datagram socket implementation factory for the application.<T> DatagramSocketsetOption(SocketOption<T> name, T value)Sets the value of a socket option.voidsetReceiveBufferSize(int size)Sets the SO_RCVBUF option to the specified value for thisDatagramSocket.voidsetReuseAddress(boolean on)Enable/disable the SO_REUSEADDR socket option.voidsetSendBufferSize(int size)Sets the SO_SNDBUF option to the specified value for thisDatagramSocket.voidsetSoTimeout(int timeout)Enable/disable SO_TIMEOUT with the specified timeout, in milliseconds.voidsetTrafficClass(int tc)Sets traffic class or type-of-service octet in the IP datagram header for datagrams sent from this DatagramSocket.Set<SocketOption<?>>supportedOptions()Returns a set of the socket options supported by this socket.
 
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Constructor Detail- 
DatagramSocketpublic DatagramSocket() throws SocketExceptionConstructs a datagram socket and binds it to any available port on the local host machine. The socket will be bound to thewildcardaddress, an IP address chosen by the kernel.If there is a security manager, its checkListenmethod is first called with 0 as its argument to ensure the operation is allowed. This could result in a SecurityException.- Throws:
- SocketException- if the socket could not be opened, or the socket could not bind to the specified local port.
- SecurityException- if a security manager exists and its- checkListenmethod doesn't allow the operation.
- See Also:
- SecurityManager.checkListen(int)
 
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DatagramSocketprotected DatagramSocket(DatagramSocketImpl impl) Creates an unbound datagram socket with the specified DatagramSocketImpl.- Parameters:
- impl- an instance of a DatagramSocketImpl the subclass wishes to use on the DatagramSocket.
- Since:
- 1.4
 
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DatagramSocketpublic DatagramSocket(SocketAddress bindaddr) throws SocketException Creates a datagram socket, bound to the specified local socket address.If, if the address is null, creates an unbound socket.If there is a security manager, its checkListenmethod is first called with the port from the socket address as its argument to ensure the operation is allowed. This could result in a SecurityException.- Parameters:
- bindaddr- local socket address to bind, or- nullfor an unbound socket.
- Throws:
- SocketException- if the socket could not be opened, or the socket could not bind to the specified local port.
- SecurityException- if a security manager exists and its- checkListenmethod doesn't allow the operation.
- Since:
- 1.4
- See Also:
- SecurityManager.checkListen(int)
 
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DatagramSocketpublic DatagramSocket(int port) throws SocketExceptionConstructs a datagram socket and binds it to the specified port on the local host machine. The socket will be bound to thewildcardaddress, an IP address chosen by the kernel.If there is a security manager, its checkListenmethod is first called with theportargument as its argument to ensure the operation is allowed. This could result in a SecurityException.- Parameters:
- port- port to use.
- Throws:
- SocketException- if the socket could not be opened, or the socket could not bind to the specified local port.
- SecurityException- if a security manager exists and its- checkListenmethod doesn't allow the operation.
- See Also:
- SecurityManager.checkListen(int)
 
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DatagramSocketpublic DatagramSocket(int port, InetAddress laddr) throws SocketExceptionCreates a datagram socket, bound to the specified local address. The local port must be between 0 and 65535 inclusive. If the IP address is 0.0.0.0, the socket will be bound to thewildcardaddress, an IP address chosen by the kernel.If there is a security manager, its checkListenmethod is first called with theportargument as its argument to ensure the operation is allowed. This could result in a SecurityException.- Parameters:
- port- local port to use
- laddr- local address to bind
- Throws:
- SocketException- if the socket could not be opened, or the socket could not bind to the specified local port.
- SecurityException- if a security manager exists and its- checkListenmethod doesn't allow the operation.
- Since:
- 1.1
- See Also:
- SecurityManager.checkListen(int)
 
 
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Method Detail- 
bindpublic void bind(SocketAddress addr) throws SocketException Binds this DatagramSocket to a specific address and port.If the address is null, then the system will pick up an ephemeral port and a valid local address to bind the socket.- Parameters:
- addr- The address and port to bind to.
- Throws:
- SocketException- if any error happens during the bind, or if the socket is already bound.
- SecurityException- if a security manager exists and its- checkListenmethod doesn't allow the operation.
- IllegalArgumentException- if addr is a SocketAddress subclass not supported by this socket.
- Since:
- 1.4
 
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connectpublic void connect(InetAddress address, int port) Connects the socket to a remote address for this socket. When a socket is connected to a remote address, packets may only be sent to or received from that address. By default a datagram socket is not connected.If the remote destination to which the socket is connected does not exist, or is otherwise unreachable, and if an ICMP destination unreachable packet has been received for that address, then a subsequent call to send or receive may throw a PortUnreachableException. Note, there is no guarantee that the exception will be thrown. If a security manager has been installed then it is invoked to check access to the remote address. Specifically, if the given addressis amulticast address, the security manager'scheckMulticastmethod is invoked with the givenaddress. Otherwise, the security manager'scheckConnectandcheckAcceptmethods are invoked, with the givenaddressandport, to verify that datagrams are permitted to be sent and received respectively.When a socket is connected, receiveandsendwill not perform any security checks on incoming and outgoing packets, other than matching the packet's and the socket's address and port. On a send operation, if the packet's address is set and the packet's address and the socket's address do not match, anIllegalArgumentExceptionwill be thrown. A socket connected to a multicast address may only be used to send packets.- Parameters:
- address- the remote address for the socket
- port- the remote port for the socket.
- Throws:
- IllegalArgumentException- if the address is null, or the port is out of range.
- SecurityException- if a security manager has been installed and it does not permit access to the given remote address
- See Also:
- disconnect()
 
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connectpublic void connect(SocketAddress addr) throws SocketException Connects this socket to a remote socket address (IP address + port number).If given an InetSocketAddress, this method behaves as if invokingconnect(InetAddress,int)with the given socket addresses IP address and port number.- Parameters:
- addr- The remote address.
- Throws:
- SocketException- if the connect fails
- IllegalArgumentException- if- addris- null, or- addris a SocketAddress subclass not supported by this socket
- SecurityException- if a security manager has been installed and it does not permit access to the given remote address
- Since:
- 1.4
 
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disconnectpublic void disconnect() Disconnects the socket. If the socket is closed or not connected, then this method has no effect.- See Also:
- connect(java.net.InetAddress, int)
 
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isBoundpublic boolean isBound() Returns the binding state of the socket.If the socket was bound prior to being closed, then this method will continue to returntrueafter the socket is closed.- Returns:
- true if the socket successfully bound to an address
- Since:
- 1.4
 
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isConnectedpublic boolean isConnected() Returns the connection state of the socket.If the socket was connected prior to being closed, then this method will continue to returntrueafter the socket is closed.- Returns:
- true if the socket successfully connected to a server
- Since:
- 1.4
 
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getInetAddresspublic InetAddress getInetAddress() Returns the address to which this socket is connected. Returnsnullif the socket is not connected.If the socket was connected prior to being closed, then this method will continue to return the connected address after the socket is closed.- Returns:
- the address to which this socket is connected.
 
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getPortpublic int getPort() Returns the port number to which this socket is connected. Returns-1if the socket is not connected.If the socket was connected prior to being closed, then this method will continue to return the connected port number after the socket is closed.- Returns:
- the port number to which this socket is connected.
 
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getRemoteSocketAddresspublic SocketAddress getRemoteSocketAddress() Returns the address of the endpoint this socket is connected to, ornullif it is unconnected.If the socket was connected prior to being closed, then this method will continue to return the connected address after the socket is closed.- Returns:
- a SocketAddressrepresenting the remote endpoint of this socket, ornullif it is not connected yet.
- Since:
- 1.4
- See Also:
- getInetAddress(),- getPort(),- connect(SocketAddress)
 
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getLocalSocketAddresspublic SocketAddress getLocalSocketAddress() Returns the address of the endpoint this socket is bound to.- Returns:
- a SocketAddressrepresenting the local endpoint of this socket, ornullif it is closed or not bound yet.
- Since:
- 1.4
- See Also:
- getLocalAddress(),- getLocalPort(),- bind(SocketAddress)
 
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sendpublic void send(DatagramPacket p) throws IOException Sends a datagram packet from this socket. TheDatagramPacketincludes information indicating the data to be sent, its length, the IP address of the remote host, and the port number on the remote host.If there is a security manager, and the socket is not currently connected to a remote address, this method first performs some security checks. First, if p.getAddress().isMulticastAddress()is true, this method calls the security manager'scheckMulticastmethod withp.getAddress()as its argument. If the evaluation of that expression is false, this method instead calls the security manager'scheckConnectmethod with argumentsp.getAddress().getHostAddress()andp.getPort(). Each call to a security manager method could result in a SecurityException if the operation is not allowed.- Parameters:
- p- the- DatagramPacketto be sent.
- Throws:
- IOException- if an I/O error occurs.
- SecurityException- if a security manager exists and its- checkMulticastor- checkConnectmethod doesn't allow the send.
- PortUnreachableException- may be thrown if the socket is connected to a currently unreachable destination. Note, there is no guarantee that the exception will be thrown.
- IllegalBlockingModeException- if this socket has an associated channel, and the channel is in non-blocking mode.
- IllegalArgumentException- if the socket is connected, and connected address and packet address differ.
- See Also:
- DatagramPacket,- SecurityManager.checkMulticast(InetAddress),- SecurityManager.checkConnect(java.lang.String, int)
 
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receivepublic void receive(DatagramPacket p) throws IOException Receives a datagram packet from this socket. When this method returns, theDatagramPacket's buffer is filled with the data received. The datagram packet also contains the sender's IP address, and the port number on the sender's machine.This method blocks until a datagram is received. The lengthfield of the datagram packet object contains the length of the received message. If the message is longer than the packet's length, the message is truncated.If there is a security manager, a packet cannot be received if the security manager's checkAcceptmethod does not allow it.- Parameters:
- p- the- DatagramPacketinto which to place the incoming data.
- Throws:
- IOException- if an I/O error occurs.
- SocketTimeoutException- if setSoTimeout was previously called and the timeout has expired.
- PortUnreachableException- may be thrown if the socket is connected to a currently unreachable destination. Note, there is no guarantee that the exception will be thrown.
- IllegalBlockingModeException- if this socket has an associated channel, and the channel is in non-blocking mode.
- See Also:
- DatagramPacket,- DatagramSocket
 
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getLocalAddresspublic InetAddress getLocalAddress() Gets the local address to which the socket is bound.If there is a security manager, its checkConnectmethod is first called with the host address and-1as its arguments to see if the operation is allowed.- Returns:
- the local address to which the socket is bound,
          nullif the socket is closed, or anInetAddressrepresentingwildcardaddress if either the socket is not bound, or the security managercheckConnectmethod does not allow the operation
- Since:
- 1.1
- See Also:
- SecurityManager.checkConnect(java.lang.String, int)
 
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getLocalPortpublic int getLocalPort() Returns the port number on the local host to which this socket is bound.- Returns:
- the port number on the local host to which this socket is bound,
                -1if the socket is closed, or0if it is not bound yet.
 
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setSoTimeoutpublic void setSoTimeout(int timeout) throws SocketExceptionEnable/disable SO_TIMEOUT with the specified timeout, in milliseconds. With this option set to a non-zero timeout, a call to receive() for this DatagramSocket will block for only this amount of time. If the timeout expires, a java.net.SocketTimeoutException is raised, though the DatagramSocket is still valid. The option must be enabled prior to entering the blocking operation to have effect. The timeout must be> 0. A timeout of zero is interpreted as an infinite timeout.- Parameters:
- timeout- the specified timeout in milliseconds.
- Throws:
- SocketException- if there is an error in the underlying protocol, such as an UDP error.
- Since:
- 1.1
- See Also:
- getSoTimeout()
 
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getSoTimeoutpublic int getSoTimeout() throws SocketExceptionRetrieve setting for SO_TIMEOUT. 0 returns implies that the option is disabled (i.e., timeout of infinity).- Returns:
- the setting for SO_TIMEOUT
- Throws:
- SocketException- if there is an error in the underlying protocol, such as an UDP error.
- Since:
- 1.1
- See Also:
- setSoTimeout(int)
 
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setSendBufferSizepublic void setSendBufferSize(int size) throws SocketExceptionSets the SO_SNDBUF option to the specified value for thisDatagramSocket. The SO_SNDBUF option is used by the network implementation as a hint to size the underlying network I/O buffers. The SO_SNDBUF setting may also be used by the network implementation to determine the maximum size of the packet that can be sent on this socket.As SO_SNDBUF is a hint, applications that want to verify what size the buffer is should call getSendBufferSize().Increasing the buffer size may allow multiple outgoing packets to be queued by the network implementation when the send rate is high. Note: If send(DatagramPacket)is used to send aDatagramPacketthat is larger than the setting of SO_SNDBUF then it is implementation specific if the packet is sent or discarded.- Parameters:
- size- the size to which to set the send buffer size. This value must be greater than 0.
- Throws:
- SocketException- if there is an error in the underlying protocol, such as an UDP error.
- IllegalArgumentException- if the value is 0 or is negative.
- See Also:
- getSendBufferSize()
 
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getSendBufferSizepublic int getSendBufferSize() throws SocketExceptionGet value of the SO_SNDBUF option for thisDatagramSocket, that is the buffer size used by the platform for output on thisDatagramSocket.- Returns:
- the value of the SO_SNDBUF option for this DatagramSocket
- Throws:
- SocketException- if there is an error in the underlying protocol, such as an UDP error.
- See Also:
- setSendBufferSize(int)
 
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setReceiveBufferSizepublic void setReceiveBufferSize(int size) throws SocketExceptionSets the SO_RCVBUF option to the specified value for thisDatagramSocket. The SO_RCVBUF option is used by the network implementation as a hint to size the underlying network I/O buffers. The SO_RCVBUF setting may also be used by the network implementation to determine the maximum size of the packet that can be received on this socket.Because SO_RCVBUF is a hint, applications that want to verify what size the buffers were set to should call getReceiveBufferSize().Increasing SO_RCVBUF may allow the network implementation to buffer multiple packets when packets arrive faster than are being received using receive(DatagramPacket).Note: It is implementation specific if a packet larger than SO_RCVBUF can be received. - Parameters:
- size- the size to which to set the receive buffer size. This value must be greater than 0.
- Throws:
- SocketException- if there is an error in the underlying protocol, such as an UDP error.
- IllegalArgumentException- if the value is 0 or is negative.
- See Also:
- getReceiveBufferSize()
 
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getReceiveBufferSizepublic int getReceiveBufferSize() throws SocketExceptionGet value of the SO_RCVBUF option for thisDatagramSocket, that is the buffer size used by the platform for input on thisDatagramSocket.- Returns:
- the value of the SO_RCVBUF option for this DatagramSocket
- Throws:
- SocketException- if there is an error in the underlying protocol, such as an UDP error.
- See Also:
- setReceiveBufferSize(int)
 
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setReuseAddresspublic void setReuseAddress(boolean on) throws SocketExceptionEnable/disable the SO_REUSEADDR socket option.For UDP sockets it may be necessary to bind more than one socket to the same socket address. This is typically for the purpose of receiving multicast packets (See MulticastSocket). TheSO_REUSEADDRsocket option allows multiple sockets to be bound to the same socket address if theSO_REUSEADDRsocket option is enabled prior to binding the socket usingbind(SocketAddress).Note: This functionality is not supported by all existing platforms, so it is implementation specific whether this option will be ignored or not. However, if it is not supported then getReuseAddress()will always returnfalse.When a DatagramSocketis created the initial setting ofSO_REUSEADDRis disabled.The behaviour when SO_REUSEADDRis enabled or disabled after a socket is bound (SeeisBound()) is not defined.- Parameters:
- on- whether to enable or disable the
- Throws:
- SocketException- if an error occurs enabling or disabling the- SO_RESUEADDRsocket option, or the socket is closed.
- Since:
- 1.4
- See Also:
- getReuseAddress(),- bind(SocketAddress),- isBound(),- isClosed()
 
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getReuseAddresspublic boolean getReuseAddress() throws SocketExceptionTests if SO_REUSEADDR is enabled.- Returns:
- a booleanindicating whether or not SO_REUSEADDR is enabled.
- Throws:
- SocketException- if there is an error in the underlying protocol, such as an UDP error.
- Since:
- 1.4
- See Also:
- setReuseAddress(boolean)
 
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setBroadcastpublic void setBroadcast(boolean on) throws SocketExceptionEnable/disable SO_BROADCAST.Some operating systems may require that the Java virtual machine be started with implementation specific privileges to enable this option or send broadcast datagrams. - Parameters:
- on- whether or not to have broadcast turned on.
- Throws:
- SocketException- if there is an error in the underlying protocol, such as an UDP error.
- Since:
- 1.4
- See Also:
- getBroadcast()
 
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getBroadcastpublic boolean getBroadcast() throws SocketExceptionTests if SO_BROADCAST is enabled.- Returns:
- a booleanindicating whether or not SO_BROADCAST is enabled.
- Throws:
- SocketException- if there is an error in the underlying protocol, such as an UDP error.
- Since:
- 1.4
- See Also:
- setBroadcast(boolean)
 
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setTrafficClasspublic void setTrafficClass(int tc) throws SocketExceptionSets traffic class or type-of-service octet in the IP datagram header for datagrams sent from this DatagramSocket. As the underlying network implementation may ignore this value applications should consider it a hint.The tc must be in the range 0 <= tc <= 255or an IllegalArgumentException will be thrown.Notes: For Internet Protocol v4 the value consists of an integer, the least significant 8 bits of which represent the value of the TOS octet in IP packets sent by the socket. RFC 1349 defines the TOS values as follows:- IPTOS_LOWCOST (0x02)
- IPTOS_RELIABILITY (0x04)
- IPTOS_THROUGHPUT (0x08)
- IPTOS_LOWDELAY (0x10)
 Setting bits in the precedence field may result in a SocketException indicating that the operation is not permitted. for Internet Protocol v6 tcis the value that would be placed into the sin6_flowinfo field of the IP header.- Parameters:
- tc- an- intvalue for the bitset.
- Throws:
- SocketException- if there is an error setting the traffic class or type-of-service
- Since:
- 1.4
- See Also:
- getTrafficClass()
 
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getTrafficClasspublic int getTrafficClass() throws SocketExceptionGets traffic class or type-of-service in the IP datagram header for packets sent from this DatagramSocket.As the underlying network implementation may ignore the traffic class or type-of-service set using setTrafficClass(int)this method may return a different value than was previously set using thesetTrafficClass(int)method on this DatagramSocket.- Returns:
- the traffic class or type-of-service already set
- Throws:
- SocketException- if there is an error obtaining the traffic class or type-of-service value.
- Since:
- 1.4
- See Also:
- setTrafficClass(int)
 
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closepublic void close() Closes this datagram socket.Any thread currently blocked in receive(java.net.DatagramPacket)upon this socket will throw aSocketException.If this socket has an associated channel then the channel is closed as well. - Specified by:
- closein interface- AutoCloseable
- Specified by:
- closein interface- Closeable
 
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isClosedpublic boolean isClosed() Returns whether the socket is closed or not.- Returns:
- true if the socket has been closed
- Since:
- 1.4
 
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getChannelpublic DatagramChannel getChannel() Returns the uniqueDatagramChannelobject associated with this datagram socket, if any.A datagram socket will have a channel if, and only if, the channel itself was created via the DatagramChannel.openmethod.- Returns:
- the datagram channel associated with this datagram socket,
          or nullif this socket was not created for a channel
- Since:
- 1.4
 
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setDatagramSocketImplFactorypublic static void setDatagramSocketImplFactory(DatagramSocketImplFactory fac) throws IOException Sets the datagram socket implementation factory for the application. The factory can be specified only once.When an application creates a new datagram socket, the socket implementation factory's createDatagramSocketImplmethod is called to create the actual datagram socket implementation.Passing nullto the method is a no-op unless the factory was already set.If there is a security manager, this method first calls the security manager's checkSetFactorymethod to ensure the operation is allowed. This could result in a SecurityException.- Parameters:
- fac- the desired factory.
- Throws:
- IOException- if an I/O error occurs when setting the datagram socket factory.
- SocketException- if the factory is already defined.
- SecurityException- if a security manager exists and its- checkSetFactorymethod doesn't allow the operation.
- Since:
- 1.3
- See Also:
- DatagramSocketImplFactory.createDatagramSocketImpl(),- SecurityManager.checkSetFactory()
 
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setOptionpublic <T> DatagramSocket setOption(SocketOption<T> name, T value) throws IOException Sets the value of a socket option.- Type Parameters:
- T- The type of the socket option value
- Parameters:
- name- The socket option
- value- The value of the socket option. A value of- nullmay be valid for some options.
- Returns:
- this DatagramSocket
- Throws:
- UnsupportedOperationException- if the datagram socket does not support the option.
- IllegalArgumentException- if the value is not valid for the option.
- IOException- if an I/O error occurs, or if the socket is closed.
- SecurityException- if a security manager is set and if the socket option requires a security permission and if the caller does not have the required permission.- StandardSocketOptionsdo not require any security permission.
- NullPointerException- if name is- null
- Since:
- 9
 
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getOptionpublic <T> T getOption(SocketOption<T> name) throws IOException Returns the value of a socket option.- Type Parameters:
- T- The type of the socket option value
- Parameters:
- name- The socket option
- Returns:
- The value of the socket option.
- Throws:
- UnsupportedOperationException- if the datagram socket does not support the option.
- IOException- if an I/O error occurs, or if the socket is closed.
- NullPointerException- if name is- null
- SecurityException- if a security manager is set and if the socket option requires a security permission and if the caller does not have the required permission.- StandardSocketOptionsdo not require any security permission.
- Since:
- 9
 
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supportedOptionspublic Set<SocketOption<?>> supportedOptions() Returns a set of the socket options supported by this socket. This method will continue to return the set of options even after the socket has been closed.- Returns:
- A set of the socket options supported by this socket. This set may be empty if the socket's DatagramSocketImpl cannot be created.
- Since:
- 9
 
 
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