MulticastSocket getTimeToLive() in Java

getTimeToLive(): This method is available in the java.net.MulticastSocket class of Java.

Syntax:

int java.net.MulticastSocket.getTimeToLive() throws IOException

This method gets the default time-to-live for multicast packets sent out on the socket.

Parameters: NA

Returns: the default time-to-live value.

Throws:

1. IOException - if an I/O exception occurs while getting the default time-to-live value.

Approach

Java

package com.MulticastSocket;

import java.io.IOException;
import java.net.MulticastSocket;

public class MulticastSocketgetTimeToLive {
    public static void main(String[] args) throws IOException {

        MulticastSocket multicastSocket = new MulticastSocket();

        System.out.println(multicastSocket.getTimeToLive());
    }
}

Output:

1

Some other methods of MulticastSocket class

MulticastSocket(): This method constructs a multicast socket and binds it to any available port on the local host machine. 

MulticastSocket(int): This method constructs a multicast socket and binds it to the specified port on the local host machine.

MulticastSocket(SocketAddress): This method creates a multicast socket, bound to the specified local socket address.

getNetworkInterface(): This method gets the multicast network interface set.

getTimeToLive(): This method gets the default time-to-live for multicast packets sent out on the socket.

joinGroup(SocketAddress, NetworkInterface): This method joins the specified multicast group at the specified interface.

leaveGroup(SocketAddress, NetworkInterface): This method leaves a multicast group on a specified local interface.

setNetworkInterface(NetworkInterface): This method specifies the network interface for outgoing multicast datagrams sent on this socket.

setTimeToLive(int): This method sets the default time-to-live for multicast packets sent out to this MulticastSocket in order to control the scope of the multicast.

MulticastSocket getNetworkInterface() in Java

getNetworkInterface(): This method is available in the java.net.MulticastSocket class of Java.

Syntax:

NetworkInterface java.net.MulticastSocket.getNetworkInterface() throws SocketException

This method gets the multicast network interface set.

Parameters: NA

Returns: The multicast NetworkInterface is currently set. A placeholder NetworkInterface is returned when there is no interface set; it has a single InetAddress to represent any local address.

Throws:

1. SocketException - if there is an error in the underlying protocol, such as a TCP error.

Approach

Java

package com.MulticastSocket;

import java.io.IOException;
import java.net.MulticastSocket;

public class MulticastSocketgetNetworkInterface {
    public static void main(String[] args) throws IOException {

        MulticastSocket multicastSocket = new MulticastSocket();

        System.out.println(multicastSocket.getNetworkInterface());
    }
}

Output:

name:0.0.0.0

Some other methods of MulticastSocket class

MulticastSocket(): This method constructs a multicast socket and binds it to any available port on the local host machine. 

MulticastSocket(int): This method constructs a multicast socket and binds it to the specified port on the local host machine.

MulticastSocket(SocketAddress): This method creates a multicast socket, bound to the specified local socket address.

getNetworkInterface(): This method gets the multicast network interface set.

getTimeToLive(): This method gets the default time-to-live for multicast packets sent out on the socket.

joinGroup(SocketAddress, NetworkInterface): This method joins the specified multicast group at the specified interface.

leaveGroup(SocketAddress, NetworkInterface): This method leaves a multicast group on a specified local interface.

setNetworkInterface(NetworkInterface): This method specifies the network interface for outgoing multicast datagrams sent on this socket.

setTimeToLive(int): This method sets the default time-to-live for multicast packets sent out to this MulticastSocket in order to control the scope of the multicast.

MulticastSocket MulticastSocket(SocketAddress) in Java

MulticastSocket(SocketAddress): This method is available in the java.net.MulticastSocket class of Java.

Syntax:

java.net.MulticastSocket.MulticastSocket(SocketAddress bindaddr) throws IOException

This method takes one argument. This method creates a multicast socket, bound to the specified local socket address.

If the address is null an unbound socket will be created.

Parameters: One parameter is required for this method.

bindaddr: Socket address to bind to, or null for an unbound socket.

Throws:

1. IOException - if an I/O exception occurs while creating the MulticastSocket.

2. SecurityException - if a security manager exists and its checkListen method doesn't allow the operation.

Approach

Java

package com.MulticastSocket;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.MulticastSocket;
import java.net.SocketAddress;

public class MulticastSocket3 {
    public static void main(String[] args) throws IOException {

        int port = 8080;
        SocketAddress bindaddr = new InetSocketAddress(port);
        MulticastSocket multicastSocket = new MulticastSocket(bindaddr);

        System.out.println(multicastSocket);
    }
}

Output:

java.net.MulticastSocket@63d4e2ba

Some other methods of MulticastSocket class

MulticastSocket(): This method constructs a multicast socket and binds it to any available port on the local host machine. 

MulticastSocket(int): This method constructs a multicast socket and binds it to the specified port on the local host machine.

MulticastSocket(SocketAddress): This method creates a multicast socket, bound to the specified local socket address.

getNetworkInterface(): This method gets the multicast network interface set.

getTimeToLive(): This method gets the default time-to-live for multicast packets sent out on the socket.

joinGroup(SocketAddress, NetworkInterface): This method joins the specified multicast group at the specified interface.

leaveGroup(SocketAddress, NetworkInterface): This method leaves a multicast group on a specified local interface.

setNetworkInterface(NetworkInterface): This method specifies the network interface for outgoing multicast datagrams sent on this socket.

setTimeToLive(int): This method sets the default time-to-live for multicast packets sent out to this MulticastSocket in order to control the scope of the multicast.

MulticastSocket MulticastSocket(int) in Java

MulticastSocket(int): This method is available in the java.net.MulticastSocket class of Java.

Syntax:

java.net.MulticastSocket.MulticastSocket(int port) throws IOException

This method takes one argument. This method constructs a multicast socket and binds it to the specified port on the local host machine. The socket will be bound to the wildcard address.

Parameters: One parameter is required for this method.

port: port to use.

Throws:

1. IOException - if an I/O exception occurs while creating the Multicast.

2. SocketSecurityException - if a security manager exists and its checkListen method doesn't allow the operation.

3. IllegalArgumentException - if the port is out of range.

Approach 1: When no exception

Java

package com.MulticastSocket;

import java.io.IOException;
import java.net.MulticastSocket;

public class MulticastSocket2 {
    public static void main(String[] args) throws IOException {

        int port = 8080;
        MulticastSocket multicastSocket = new MulticastSocket(port);

        System.out.println(multicastSocket);
    }
}

Output:

java.net.MulticastSocket@63d4e2ba

Approach 2: IllegalArgumentException

Java

package com.MulticastSocket;

import java.io.IOException;
import java.net.MulticastSocket;

public class MulticastSocket2 {
    public static void main(String[] args) throws IOException {

        int port = 98080;
        MulticastSocket multicastSocket = new MulticastSocket(port);

        System.out.println(multicastSocket);
    }
}

Output:

Exception in thread "main" java.lang.IllegalArgumentException: port out of range:98080
	at java.base/java.net.InetSocketAddress.checkPort(InetSocketAddress.java:153)
	at java.base/java.net.InetSocketAddress.<init>(InetSocketAddress.java:198)
	at java.base/java.net.InetSocketAddress.<init>(InetSocketAddress.java:176)
	at java.base/java.net.MulticastSocket.<init>(MulticastSocket.java:202)
	at com.MulticastSocket.MulticastSocket2.main(MulticastSocket2.java:10)

Some other methods of MulticastSocket class

MulticastSocket(): This method constructs a multicast socket and binds it to any available port on the local host machine. 

MulticastSocket(int): This method constructs a multicast socket and binds it to the specified port on the local host machine.

MulticastSocket(SocketAddress): This method creates a multicast socket, bound to the specified local socket address.

getNetworkInterface(): This method gets the multicast network interface set.

getTimeToLive(): This method gets the default time-to-live for multicast packets sent out on the socket.

joinGroup(SocketAddress, NetworkInterface): This method joins the specified multicast group at the specified interface.

leaveGroup(SocketAddress, NetworkInterface): This method leaves a multicast group on a specified local interface.

setNetworkInterface(NetworkInterface): This method specifies the network interface for outgoing multicast datagrams sent on this socket.

setTimeToLive(int): This method sets the default time-to-live for multicast packets sent out to this MulticastSocket in order to control the scope of the multicast.

MulticastSocket MulticastSocket() in Java

MulticastSocket(): This method is available in the java.net.MulticastSocket class of Java.

Syntax:

java.net.MulticastSocket.MulticastSocket() throws IOException

This method constructs a multicast socket and binds it to any available port on the local host machine. The socket will be bound to the wildcard address.

Parameters: NA

Throws:

1. IOException - if an I/O exception occurs while creating the Multicast.

2. SocketSecurityException - if a security manager exists and its checkListen method doesn't allow the operation.

Approach

Java

package com.MulticastSocket;

import java.io.IOException;
import java.net.MulticastSocket;

public class MulticastSocket1 {
    public static void main(String[] args) throws IOException {

        MulticastSocket multicastSocket = new MulticastSocket();

        System.out.println(multicastSocket);
    }
}

Output:

java.net.MulticastSocket@63d4e2ba

Some other methods of MulticastSocket class

MulticastSocket(): This method constructs a multicast socket and binds it to any available port on the local host machine. 

MulticastSocket(int): This method constructs a multicast socket and binds it to the specified port on the local host machine.

MulticastSocket(SocketAddress): This method creates a multicast socket, bound to the specified local socket address.

getNetworkInterface(): This method gets the multicast network interface set.

getTimeToLive(): This method gets the default time-to-live for multicast packets sent out on the socket.

joinGroup(SocketAddress, NetworkInterface): This method joins the specified multicast group at the specified interface.

leaveGroup(SocketAddress, NetworkInterface): This method leaves a multicast group on a specified local interface.

setNetworkInterface(NetworkInterface): This method specifies the network interface for outgoing multicast datagrams sent on this socket.

setTimeToLive(int): This method sets the default time-to-live for multicast packets sent out to this MulticastSocket in order to control the scope of the multicast.

MalformedURLException in Java

java.net.MalformedURLException

Thrown to indicate that a malformed URL has occurred. Either no legal protocol could be found in a specification string or the string could not be parsed.

Declaration

public class MalformedURLException extends IOException {
    @java.io.Serial
    private static final long serialVersionUID = -182787522200415866L;

   
    public MalformedURLException() {
    }

  
    public MalformedURLException(String msg) {
        super(msg);
    }
}

Methods

1. MalformedURLException()

java.net.MalformedURLException.MalformedURLException()

This method constructs a MalformedURLException with no detailed message.

Java

package com.MalformedURLException;

import java.net.MalformedURLException;

public class MalformedURLException1 {
    public static void main(String[] args) {

        MalformedURLException exception = new MalformedURLException();
        System.out.println(exception);
    }
}

Output:

java.net.MalformedURLException

2. MalformedURLException(String msg)

java.net.MalformedURLException.MalformedURLException(String msg)

This method constructs a MalformedURLException with the specified detail message.

Parameters: msg the detail message.

Java

package com.MalformedURLException;

import java.net.MalformedURLException;

public class MalformedURLException2 {
    public static void main(String[] args) {

        String msg = "exception occured";
        MalformedURLException exception = new MalformedURLException(msg);
        System.out.println(exception);
    }
}

Output:

java.net.MalformedURLException: exception occured

JarURLConnection getManifest() in Java

getManifest(): This method is available in the java.net.JarURLConnection class of Java.

Syntax:

Manifest java.net.JarURLConnection.getManifest() throws IOException

This method returns the Manifest for this connection, or null if none.

Parameters: NA

Returns: the manifest object corresponding to the JAR file object for this connection.

Throws:

1. IOException - if getting the JAR file for this connection causes an IOException to be thrown.

Approach

Java

package com.JarURLConnection;

import java.net.JarURLConnection;
import java.net.URL;

public class JarURLConnectiongetManifest {

    private final static String JAR_URL = "jar:file:/D:/testClass.jar!/";

    public static void main(String[] args) throws Exception {

        URL FileSysUrl = new URL(JAR_URL);

        JarURLConnection jarURLConn = (JarURLConnection) FileSysUrl.openConnection();

        System.out.println(jarURLConn.getManifest());

    }
}

Output:

java.util.jar.Manifest@49f83991

Some other methods of JarURLConnection class

getAttributes(): This method returns the Attributes object for this connection if its URL points to a JAR file entry, null otherwise.

getCertificates(): This method returns the Certificate objects for this connection if the URL for it points to a JAR file entry, null otherwise.

getEntryName(): This method returns the entry name for this connection.

getJarEntry(): This method returns the JAR entry object for this connection if any. 

getJarFile(): This method returns the JAR file for this connection.

getJarFileURL(): This method returns the URL for the Jar file for this connection.

getMainAttributes(): This method returns the main Attributes for the JAR file for this connection.

getManifest(): This method returns the Manifest for this connection, or null if none.

JarURLConnection class in Java

java.net.JarURLConnection

A URL Connection to a Java ARchive (JAR) file or an entry in a JAR file.

The syntax of a JAR URL is: jar:<url>!/{entry}

JarURLConnection instances can only be used to read from JAR files. It is not possible to get a java.io.OutputStream to modify or write to the underlying JAR file using this class.

Some methods of JarURLConnection class

getAttributes(): This method returns the Attributes object for this connection if its URL points to a JAR file entry, null otherwise.

getCertificates(): This method returns the Certificate objects for this connection if the URL for it points to a JAR file entry, null otherwise.

getEntryName(): This method returns the entry name for this connection.

getJarEntry(): This method returns the JAR entry object for this connection if any. 

getJarFile(): This method returns the JAR file for this connection.

getJarFileURL(): This method returns the URL for the Jar file for this connection.

getMainAttributes(): This method returns the main Attributes for the JAR file for this connection.

getManifest(): This method returns the Manifest for this connection, or null if none.

JarURLConnection getMainAttributes() in Java

getMainAttributes(): This method is available in the java.net.JarURLConnection class of Java.

Syntax:

Attributes java.net.JarURLConnection.getMainAttributes() throws IOException

This method returns the main Attributes for the JAR file for this connection.

Parameters: NA

Returns: the main Attributes for the JAR file for this connection.

Throws:

1. IOException - if getting the manifest causes anIOException to be thrown.

Approach

Java

package com.JarURLConnection;

import java.net.JarURLConnection;
import java.net.URL;

public class JarURLConnectiongetMainAttributes {

    private final static String JAR_URL = "jar:file:/D:/testClass.jar!/";

    public static void main(String[] args) throws Exception {

        URL FileSysUrl = new URL(JAR_URL);

        JarURLConnection jarURLConn = 
                      (JarURLConnection) FileSysUrl.openConnection();

        System.out.println(jarURLConn.getMainAttributes());

    }
}

Output:

java.util.jar.Attributes@49f83991

Some other methods of JarURLConnection class

getAttributes(): This method returns the Attributes object for this connection if its URL points to a JAR file entry, null otherwise.

getCertificates(): This method returns the Certificate objects for this connection if the URL for it points to a JAR file entry, null otherwise.

getEntryName(): This method returns the entry name for this connection.

getJarEntry(): This method returns the JAR entry object for this connection if any. 

getJarFile(): This method returns the JAR file for this connection.

getJarFileURL(): This method returns the URL for the Jar file for this connection.

getMainAttributes(): This method returns the main Attributes for the JAR file for this connection.

getManifest(): This method returns the Manifest for this connection, or null if none.

JarURLConnection getJarFileURL() in Java

getJarFileURL(): This method is available in the java.net.JarURLConnection class of Java.

Syntax:

URL java.net.JarURLConnection.getJarFileURL()

This method returns the URL for the Jar file for this connection.

Parameters: NA

Returns: the URL for the Jar file for this connection.

Exceptions: NA

Approach

Java

package com.JarURLConnection;

import java.net.JarURLConnection;
import java.net.URL;

public class JarURLConnectiongetJarFileURL {

    private final static String JAR_URL = "jar:file:/D:/testClass.jar!/";

    public static void main(String[] args) throws Exception {

        URL FileSysUrl = new URL(JAR_URL);

        JarURLConnection jarURLConn = 
            (JarURLConnection) FileSysUrl.openConnection();

        System.out.println(jarURLConn.getJarFileURL());

    }
}

Output:

file:/D:/testClass.jar

Some other methods of JarURLConnection class

getAttributes(): This method returns the Attributes object for this connection if its URL points to a JAR file entry, null otherwise.

getCertificates(): This method returns the Certificate objects for this connection if the URL for it points to a JAR file entry, null otherwise.

getEntryName(): This method returns the entry name for this connection.

getJarEntry(): This method returns the JAR entry object for this connection if any. 

getJarFile(): This method returns the JAR file for this connection.

getJarFileURL(): This method returns the URL for the Jar file for this connection.

getMainAttributes(): This method returns the main Attributes for the JAR file for this connection.

getManifest(): This method returns the Manifest for this connection, or null if none.

JarURLConnection getJarFile() in Java

getJarFile(): This method is available in the java.net.JarURLConnection class of Java.

Syntax:

JarFile java.net.JarURLConnection.getJarFile() throws IOException

This method returns the JAR file for this connection.

Parameters: NA

Returns: the JAR file for this connection. If the connection is a connection to an entry of a JAR file, the JAR file object is returned.

Throws:

1. IOException - if an IOException occurs while trying to connect to the JAR file for this connection.

Approach

Java

package com.JarURLConnection;

import java.net.JarURLConnection;
import java.net.URL;

public class JarURLConnectiongetJarFile {

    private final static String JAR_URL = "jar:file:/D:/testClass.jar!/";

    public static void main(String[] args) throws Exception {

        URL FileSysUrl = new URL(JAR_URL);

        JarURLConnection jarURLConn = 
             (JarURLConnection) FileSysUrl.openConnection();

        System.out.println(jarURLConn.getJarFile());

    }
}

Output:

sun.net.www.protocol.jar.URLJarFile@27ddd392

Some other methods of JarURLConnection class

getAttributes(): This method returns the Attributes object for this connection if its URL points to a JAR file entry, null otherwise.

getCertificates(): This method returns the Certificate objects for this connection if the URL for it points to a JAR file entry, null otherwise.

getEntryName(): This method returns the entry name for this connection.

getJarEntry(): This method returns the JAR entry object for this connection if any. 

getJarFile(): This method returns the JAR file for this connection.

getJarFileURL(): This method returns the URL for the Jar file for this connection.

getMainAttributes(): This method returns the main Attributes for the JAR file for this connection.

getManifest(): This method returns the Manifest for this connection, or null if none.