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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

1.

Which of these is a return type of getAddress() method of DatagramPacket class?(a) DatagramPacket(b) DatagramSocket(c) InetAddress(d) ServerSocketI had been asked this question in an interview for internship.I'd like to ask this question from Networking in division Serialization & Networking of Java

Answer»

The CORRECT OPTION is (C) InetAddress

Best EXPLANATION: NONE.
Discussion
2.

Which of these method of DatagramPacket class is used to find the destination address?(a) findAddress()(b) getAddress()(c) Address()(d) whois()This question was posed to me in an interview.My question is from Networking in chapter Serialization & Networking of Java

Answer»

Correct OPTION is (B) GETADDRESS()

Easy EXPLANATION: None.
Discussion
3.

Which of these class must be used to send a datagram packets over a connection?(a) InetAdress(b) DatagramPacket(c) DatagramSocket(d) All of the mentionedThe question was asked in an interview.Question is taken from Networking in portion Serialization & Networking of Java

Answer»

The correct option is (d) All of the mentioned

Explanation: By using 5 CLASSES we can send and receive data between CLIENT and server, these are INETADDRESS, Socket, ServerSocket, DatagramSocket, and DatagramPacket.
Discussion
4.

Which of these methods of DatagramPacket is used to find the length of byte array?(a) getnumber()(b) length()(c) Length()(d) getLength()This question was addressed to me by my college professor while I was bunking the class.My question is taken from Networking topic in section Serialization & Networking of Java

Answer»

Correct ANSWER is (d) GETLENGTH()

For 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.
Discussion
5.

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()The question was asked at a job interview.The question is from Networking in portion Serialization & Networking of Java

Answer»

Correct answer is (a) GETDATA()

EASIEST explanation: NONE.
Discussion
6.

Which of these method of DatagramPacket is used to find the port number?(a) port()(b) getPort()(c) findPort()(d) recievePort()This question was posed to me in unit test.I want to ask this question from Networking topic in section Serialization & Networking of Java

Answer» RIGHT CHOICE is (B) getPort()

EXPLANATION: NONE.
Discussion
7.

Which of these class is necessary to implement datagrams?(a) DatagramPacket(b) DatagramSocket(c) All of the mentioned(d) None of the mentionedI had been asked this question at a job interview.I would like to ask this question from Networking topic in portion Serialization & Networking of Java

Answer» RIGHT OPTION is (C) All of the mentioned

The BEST explanation: NONE.
Discussion
8.

Which of these is a bundle of information passed between machines?(a) Mime(b) Cache(c) Datagrams(d) DatagramSocketThis question was addressed to me by my school teacher while I was bunking the class.The question is from Networking topic in chapter Serialization & Networking of Java

Answer» RIGHT choice is (c) DATAGRAMS

Explanation: The Datagrams are the BUNDLE of information PASSED between machines.
Discussion
9.

Which of these methods is used to know the type of content used in the URL?(a) ContentType()(b) contentType()(c) getContentType()(d) GetContentType()I had been asked this question at a job interview.Question is from HttpResponse & URLConnection Class topic in section Serialization & Networking of Java

Answer»

The CORRECT ANSWER is (C) getContentType()

For EXPLANATION: NONE.
Discussion
10.

Which of these methods is used to know when was the URL last modified?(a) LastModified()(b) getLastModified()(c) GetLastModified()(d) getlastModified()()The question was asked during an online interview.This question is from HttpResponse & URLConnection Class in section Serialization & Networking of Java

Answer» RIGHT OPTION is (B) getLastModified()

The EXPLANATION: NONE.
Discussion
11.

Which of these transfer protocol must be used so that URL can be accessed by URLConnection class object?(a) http(b) https(c) Any Protocol can be used(d) None of the mentionedThis question was posed to me in semester exam.My question is from HttpResponse & URLConnection Class in division Serialization & Networking of Java

Answer»

Correct OPTION is (a) http

The EXPLANATION is: For a URL to be ACCESSED from remote location http protocol must be USED.
Discussion
12.

Which of these is a wrapper around everything associated with a reply from an http server?(a) HTTP(b) HttpResponse(c) HttpRequest(d) httpserverI got this question in an online interview.My question comes from HttpResponse & URLConnection Class in division Serialization & Networking of Java

Answer»

The CORRECT option is (b) HttpResponse

Explanation: HttpResponse is wrapper AROUND everything associated with a REPLY from an HTTP server.
Discussion
13.

Which of these methods is used to know the full URL of an URL object?(a) fullHost()(b) getHost()(c) ExternalForm()(d) toExternalForm()I have been asked this question during an online exam.I would like to ask this question from URL Class topic in chapter Serialization & Networking of Java

Answer»

Right choice is (d) toExternalForm()

To EXPLAIN I WOULD SAY: NONE.
Discussion
14.

Which of these methods is used to know host of an URL?(a) host()(b) getHost()(c) GetHost()(d) gethost()This question was posed to me during an interview for a job.My question comes from URL Class in chapter Serialization & Networking of Java

Answer» CORRECT OPTION is (B) getHost()

The EXPLANATION: NONE.
Discussion
15.

Which of these exceptions is thrown by URL class’s constructors?(a) URLNotFound(b) URLSourceNotFound(c) MalformedURLException(d) URLNotFoundExceptionThis question was addressed to me in class test.The doubt is from URL Class topic in division Serialization & Networking of Java

Answer» RIGHT CHOICE is (C) MalformedURLException

Best EXPLANATION: NONE.
Discussion
16.

What does URL stands for?(a) Uniform Resource Locator(b) Uniform Resource Latch(c) Universal Resource Locator(d) Universal Resource LatchThis question was addressed to me in a national level competition.Enquiry is from URL Class in section Serialization & Networking of Java

Answer»

Right ANSWER is (a) UNIFORM RESOURCE Locator

Explanation: URL is Uniform Resource Locator.
Discussion
17.

Which of these method is used to start a server thread?(a) run()(b) start()(c) runThread()(d) startThread()The question was asked during an online exam.The doubt is from Networking in portion Serialization & Networking of Java

Answer»

Right CHOICE is (a) run()

To explain: run() method is called when the SERVER THREAD is started.
Discussion
18.

Which of these method of httpd class is used to write UrlCacheEntry object into local disk?(a) writeDiskCache()(b) writetoDisk()(c) writeCache()(d) writeDiskEntry()This question was addressed to me during an internship interview.The doubt is from Networking topic in division Serialization & Networking of Java

Answer»

Right answer is (a) writeDiskCache()

For explanation: The writeDiskCache() method takes an UrlCacheEntry object and writes it PERSISTENTLY into the local DISK. It constructs directory NAMES out of URL, making SURE to replace the slash(/) characters with system dependent seperatorChar.
Discussion
19.

Which of these variables stores the number of hits that are successfully served out of cache?(a) hits(b) hitstocache(c) hits_to_cache(d) hits.to.cacheI got this question in final exam.My enquiry is from Networking topic in division Serialization & Networking of Java

Answer»

The CORRECT ANSWER is (d) hits.to.cache

To EXPLAIN: NONE.
Discussion
20.

Which of these method of httpd class is used to get report on each hit to HTTP server?(a) log()(b) logEntry()(c) logHttpd()(d) logResponse()The question was posed to me during an internship interview.My question is taken from Networking topic in portion Serialization & Networking of Java

Answer»

Right CHOICE is (B) logEntry()

EASY EXPLANATION: None.
Discussion
21.

Which of these methods are used to find a URL from the cache of httpd?(a) findfromCache()(b) findFromCache()(c) serveFromCache()(d) getFromCache()I have been asked this question in an online interview.My doubt stems from Networking in chapter Serialization & Networking of Java

Answer»

The correct option is (c) serveFromCache()

To explain I would say: serveFromCatche() is a boolean METHOD that ATTEMPTS to FIND a particular URL in the cache. If it is successful then the content of that cache entry are written to the client, OTHERWISE it RETURNS false.
Discussion
22.

Which of these methods of httpd class is used to read data from the stream?(a) getDta()(b) GetResponse()(c) getStream()(d) getRawRequest()The question was asked during a job interview.The origin of the question is Networking topic in division Serialization & Networking of Java

Answer» RIGHT option is (d) getRawRequest()

Best explanation: The getRawRequest() method reads data froma STREAM until it gets TWO CONSECUTIVE newline CHARACTERS.
Discussion
23.

Which of these is an instance variable of class httpd?(a) port(b) cache(c) log(d) All of the mentionedI got this question in unit test.I want to ask this question from Networking topic in section Serialization & Networking of Java

Answer»

The CORRECT CHOICE is (d) All of the mentioned

To explain: There are 5 instance VARIABLES: PORT, docRoot, log, CACHE and stopFlag. All of them are private.
Discussion
24.

Which of these method of MimeHeader is used to return the string equivalent of the values stores on MimeHeader?(a) string()(b) toString()(c) convertString()(d) getString()The question was asked in an interview.My question is taken from Networking in portion Serialization & Networking of Java

Answer»

Right option is (b) toString()

To elaborate: toString() does the REVERSE of parse() method, it is used to RETURN the string EQUIVALENT of the VALUES stores on MIMEHEADER.
Discussion
25.

Which of these methods is used to make raw MIME formatted string?(a) parse()(b) toString()(c) getString()(d) parseString()The question was asked in an interview for internship.Asked question is from Networking topic in chapter Serialization & Networking of Java

Answer»

Right ANSWER is (a) PARSE()

Easiest EXPLANATION: None.
Discussion
26.

Which of these class is used for operating on request from the client to the server?(a) http(b) httpDecoder(c) httpConnection(d) httpdThe question was asked in unit test.I'm obligated to ask this question of Networking in chapter Serialization & Networking of Java

Answer» RIGHT ANSWER is (d) httpd

For EXPLANATION: NONE.
Discussion
27.

Which of these is a standard for communicating multimedia content over email?(a) http(b) https(c) Mime(d) httpdThis question was posed to me during an interview.The doubt is from Networking topic in division Serialization & Networking of Java

Answer»

Correct answer is (c) Mime

Explanation: MIME is an INTERNET standard for communicating multimedia content over EMAIL. The HTTP protocol uses and extends the notion of MIME headers to PASS attribute pairs between HTTP CLIENT and SERVER.
Discussion
28.

Which of these class is used to create servers that listen for either local or remote client programs?(a) httpServer(b) ServerSockets(c) MimeHeader(d) HttpResponseThe question was asked in homework.Question is taken from Networking in portion Serialization & Networking of Java

Answer»

The CORRECT OPTION is (B) ServerSockets

Easy EXPLANATION: NONE.
Discussion
29.

Which of these class is used to create servers that listen for either local or remote client programs?(a) httpServer(b) ServerSockets(c) MimeHeader(d) HttpResponseI got this question in an interview for internship.This key question is from Networking in division Serialization & Networking of Java

Answer»
Discussion
30.

Which of these interface abstractes the output of messages from httpd?(a) LogMessage(b) LogResponse(c) Httpdserver(d) httpdResponseI have been asked this question during a job interview.I'd like to ask this question from Networking topic in portion Serialization & Networking of Java

Answer»

The CORRECT option is (a) LogMessage

To explain I would say: LogMessage is a simple interface that is USED to ABSTRACT the output of MESSAGES from the httpd.
Discussion
31.

How many bits are in a single IP address?(a) 8(b) 16(c) 32(d) 64I have been asked this question in homework.My query is from Networking Basics topic in division Serialization & Networking of Java

Answer» RIGHT answer is (c) 32

The BEST I can EXPLAIN: NONE.
Discussion
32.

Which of these is a protocol for breaking and sending packets to an address across a network?(a) TCP/IP(b) DNS(c) Socket(d) Proxy ServerThe question was posed to me in an interview for job.My query is from Networking Basics in portion Serialization & Networking of Java

Answer» RIGHT option is (a) TCP/IP

Explanation: TCP/IP –Transfer control PROTOCOL/Internet Protocol is used to BREAK data into SMALL packets an send them to an address across a network.
Discussion
33.

Which of these is a full form of DNS?(a) Data Network Service(b) Data Name Service(c) Domain Network Service(d) Domain Name ServiceI had been asked this question during an online interview.I would like to ask this question from Networking Basics topic in division Serialization & Networking of Java

Answer» RIGHT CHOICE is (d) Domain Name Service

Easiest EXPLANATION: NONE.
Discussion
34.

How many ports of TCP/IP are reserved for specific protocols?(a) 10(b) 1024(c) 2048(d) 512The question was asked in an interview for job.This key question is from Networking Basics in section Serialization & Networking of Java

Answer»

The CORRECT ANSWER is (B) 1024

Explanation: NONE.
Discussion
35.

Which of these package contains classes and interfaces for networking?(a) java.io(b) java.util(c) java.net(d) java.networkI had been asked this question during an online exam.My query is from Networking Basics in section Serialization & Networking of Java

Answer» RIGHT OPTION is (C) java.net

Easiest EXPLANATION: NONE.
Discussion
36.

Which of these is a method of ObjectInput interface used to deserialize an object from a stream?(a) int read()(b) void close()(c) Object readObject()(d) Object WriteObject()I had been asked this question by my college professor while I was bunking the class.This interesting question is from Serialization & Deserialization in section Serialization & Networking of Java

Answer»

Correct ANSWER is (C) Object readObject()

EASY EXPLANATION: None.
Discussion
37.

Which of these process occur automatically by java run time system?(a) Serialization(b) Memory allocation(c) Deserialization(d) All of the mentionedI had been asked this question by my school teacher while I was bunking the class.This key question is from Serialization & Deserialization in portion Serialization & Networking of Java

Answer» CORRECT option is (d) All of the mentioned

Easy explanation: SERIALIZATION, deserialization and Memory allocation occur automatically by java run TIME SYSTEM.
Discussion
38.

Which of these interface extends DataInput interface?(a) Serializable(b) Externalization(c) ObjectOutput(d) ObjectInputI had been asked this question in quiz.The above asked question is from Serialization & Deserialization topic in portion Serialization & Networking of Java

Answer»

Correct OPTION is (d) OBJECTINPUT

The best EXPLANATION: ObjectInput interface extends the DataInput interface and supports object SERIALIZATION.
Discussion
39.

Which of these is a process of extracting/removing the state of an object from a stream?(a) Serialization(b) Externalization(c) File Filtering(d) DeserializationThis question was posed to me in my homework.My doubt is from Serialization & Deserialization in division Serialization & Networking of Java

Answer»

Correct CHOICE is (d) Deserialization

The best I can EXPLAIN: Deserialization is a process by which the DATA WRITTEN in the stream can be EXTRACTED out from the stream.
Discussion
40.

Which of the following methods is not used while Serialization and DeSerialization?(a) readObject()(b) readExternal()(c) readWriteObject()(d) writeObject()I got this question during an interview.My enquiry is from Serialization in division Serialization & Networking of Java

Answer»

The CORRECT choice is (c) readWriteObject()

Easy EXPLANATION: USING readObject(), writeObject(), readExternal() and writeExternal() methods Serialization and DESERIALIZATION are implemented.
Discussion
41.

Which of the following methods is used to avoid serialization of new class whose super class already implements Serialization?(a) writeObject()(b) readWriteObject()(c) writeReadObject()(d) unSerializaedObject()I have been asked this question by my school teacher while I was bunking the class.My query is from Serialization in division Serialization & Networking of Java

Answer» CORRECT ANSWER is (a) writeObject()

EXPLANATION: writeObject() and readObject() METHODS should be implemented to avoid Java serialization.
Discussion
42.

Default Serialization process cannot be overridden.(a) True(b) FalseI got this question in a job interview.Query is from Serialization in portion Serialization & Networking of Java

Answer»

The CORRECT OPTION is (b) False

For explanation I would say: Default SERIALIZATION process can be OVERRIDDEN.
Discussion
43.

If member does not implement serialization, which exception would be thrown?(a) RuntimeException(b) SerializableException(c) NotSerializableException(d) UnSerializedExceptionThis question was posed to me in an internship interview.My question is from Serialization in chapter Serialization & Networking of Java

Answer»

The CORRECT option is (C) NotSerializableException

The EXPLANATION: If member of a class does not implement SERIALIZATION, NotSerializationException will be thrown.
Discussion
44.

What type of members are not serialized?(a) Private(b) Protected(c) Static(d) ThrowableThis question was addressed to me in unit test.I want to ask this question from Serialization in chapter Serialization & Networking of Java

Answer» CORRECT ANSWER is (c) STATIC

The BEST explanation: All static and transient VARIABLES are not serialized.
Discussion
45.

How many methods Serializable has?(a) 1(b) 2(c) 3(d) 0This question was posed to me in an interview for internship.My question is based upon Serialization in section Serialization & Networking of Java

Answer»

Correct OPTION is (d) 0

For EXPLANATION I would say: Serializable interface does not have any method. It is also called a MARKER interface.
Discussion
46.

What is deserialization?(a) Turning object in memory into stream of bytes(b) Turning stream of bytes into an object in memory(c) Turning object in memory into stream of bits(d) Turning stream of bits into an object in memoryI have been asked this question during an online interview.My question comes from Serialization topic in division Serialization & Networking of Java

Answer»

The correct choice is (B) Turning STREAM of bytes into an object in memory

Explanation: Deserialization is the REVERSE process of SERIALIZATION which is turning stream of bytes into an object in memory.
Discussion
47.

What is serialization?(a) Turning object in memory into stream of bytes(b) Turning stream of bytes into an object in memory(c) Turning object in memory into stream of bits(d) Turning stream of bits into an object in memoryI got this question in class test.Enquiry is from Serialization in portion Serialization & Networking of Java

Answer»

The CORRECT option is (a) TURNING object in memory into stream of bytes

For explanation I would say: SERIALIZATION in JAVA is the PROCESS of turning object in memory into stream of bytes.
Discussion
48.

How an object can become serializable?(a) If a class implements java.io.Serializable class(b) If a class or any superclass implements java.io.Serializable interface(c) Any object is serializable(d) No object is serializableI have been asked this question by my school principal while I was bunking the class.Enquiry is from Serialization in division Serialization & Networking of Java

Answer»

The correct CHOICE is (b) If a CLASS or any superclass implements java.io.SERIALIZABLE interface

To EXPLAIN I would say: A Java OBJECT is serializable if class or any its superclass implements java.io.Serializable or its subinterface java.io.Externalizable.
Discussion
49.

Which of these process occur automatically by the java runtime system?(a) Serialization(b) Garbage collection(c) File Filtering(d) All of the mentionedThe question was asked during an internship interview.This intriguing question originated from Serialization topic in division Serialization & Networking of Java

Answer»

Right OPTION is (a) Serialization

Explanation: Serialization and deserialization occur AUTOMATICALLY by java runtime SYSTEM, Garbage COLLECTION ALSO occur automatically but is done by CPU or the operating system not by the java runtime system.
Discussion
50.

Which of these is a method of ObjectOutput interface used to finalize the output state so that any buffers are cleared?(a) clear()(b) flush()(c) fflush()(d) close()The question was posed to me in homework.Origin of the question is Serialization in section Serialization & Networking of Java

Answer» RIGHT ANSWER is (b) FLUSH()

EASY explanation: None.
Discussion