This set of Java Multiple Choice Questions & Answers (MCQs) focuses on “Networking – Datagrams”.
1. Which of these is a bundle of information passed between machines?
a) Mime
b) Cache
c) Datagrams
d) DatagramSocket
View Answer
Explanation: The Datagrams are the bundle of information passed between machines.
2. Which of these class is necessary to implement datagrams?
a) DatagramPacket
b) DatagramSocket
c) All of the mentioned
d) None of the mentioned
View Answer
Explanation: None.
3. Which of these method of DatagramPacket is used to find the port number?
a) port()
b) getPort()
c) findPort()
d) recievePort()
View Answer
Explanation: None.
4. Which of these method of DatagramPacket is used to obtain the byte array of data contained in a datagram?
a) getData()
b) getBytes()
c) getArray()
d) recieveBytes()
View Answer
Explanation: None.
5. Which of these method of DatagramPacket is used to find the length of byte array?
a) getnumber()
b) length()
c) Length()
d) getLength()
View Answer
Explanation: getLength returns the length of the valid data contained in the byte array that would be returned from the getData () method. This typically is not equal to length of whole byte array.
6. Which of these class must be used to send a datatgram packets over a connection?
a) InetAdress
b) DatagramPacket
c) DatagramSocket
d) All of the mentioned
View Answer
Explanation: By using 5 classes we can send and receive data between client and server, these are InetAddress, Socket, ServerSocket, DatagramSocket, and DatagramPacket.
7. What is the output of this program?
import java.net.*;
class networking{public static void main(String[] args) throws Exception
{URL obj = new URL("https://www.sanfoundry.com/javamcq");
URLConnection obj1 = obj.openConnection();
System.out.print(obj1.getContentType());
}}
Note: Host URL is written in html and simple text.
a) html
b) text
c) html/text
d) text/html
View Answer
Explanation: None.
Output:
$ javac networking.java
$ java networking
text/html
8. Which of these method of DatagramPacket class is used to find the destination address?
a) findAddress()
b) getAddress()
c) Address()
d) whois()
View Answer
Explanation: None.
9. Which of these is a return type of getAddress() method of DatagramPacket class?
a) DatagramPacket
b) DatagramSocket
c) InetAddress
d) ServerSocket
View Answer
Explanation: None.
10. Which API gets the SocketAddress (usually IP address + port number) of the remote host that this packet is being sent to or is coming from.
a) getSocketAddress()
b) getAddress()
c) address()
d) none of the mentioned
View Answer
Explanation: getSocketAddress() is used to get the socket address
Sanfoundry Global Education & Learning Series – Java Programming Language.
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