Java Test

Which of the following statements are true about local inner class within a method?

IT CAN BE MARKED AS STATIC

IT CAN ONLY ACCESS FINAL MEMBERS OF ITS ENCLOSING CLASS

IT HAS ACCESS TO ALL MEMBERS OF ITS ENCLOSING CLASS

NONE OF THE ABOVE

What is the output of the given program? public class Test96 { public static void main(String[] args) { int[] a = new int[2]; System.out.println(a.length); } }

3

0

1

2

Which of the following statements about threading is incorrect?

YOU CAN OBTAIN A MUTUALLY EXCLUSIVE LOCK ON ANY OBJECT

THREAD SCHEDULING ALGORITHMS ARE PLATFORM DEPENDENT

YOU CAN ONLY OBTAIN A MUTUALLY EXCLUSIVE LOCK ON METHODS IN A CLASS THAT EXTENDS THREAD OR IMPLEMENTS RUNNABLE

A THREAD CAN OBTAIN A MUTUALLY EXCLUSIVE LOCK ON AN OBJECT BY CALLING A SYNCHRONIZED METHOD ON THAT OBJECT

What will the length() method in the File class return?

THE NUMBER OF CHARACTERS IN THE FILE

THE NUMBER OF BYTES IN THE FILE

THE NUMBER OF LINES IN THE FILE

NONE OF THE ABOVE

Choose the correct statement:

A CONSTRUCTOR WITH NO ARGUMENTS WILL BE THE DEFAULT CONSTRUCTOR

CONSTRUCTORS CANNOT BE OVERLOADED

A CALL TO A CONSTRUCTOR IN A PARENT CLASS CAN ONLY BE MADE FROM WITHIN A CONSTRUCTOR

A CONSTRUCTOR MAY NOT BE DECLARED AS PRIVATE

What is the superclass of java.net.DatagramSocket?

JAVA.NET.SOCKET

JAVA.NET.UDPSOCKET

JAVA.NET.SOCKETINTERFACE

JAVA.LANG.OBJECT

Which of the following statements is true of the HashMap class?

IT STORES INFORMATION AS KEY/VALUE PAIRS

ELEMENTS ARE RETURNED IN THE ORDER THEY WERE ADDED

IT DOES NOT PERMIT NULL KEYS

IT DOES NOT PERMIT NULL VALUES

Which of the following statements are correct with regard to Polymorphism?

Note: Select more than 1 option as correct answer

POLYMORPHISM IS A METHOD IN WHICH A CLASS CAN EXIST IN MULTIPLE FORMS

POLYMORPHISM IS A METHOD IN WHICH A CLASS CAN EXIST IN ONLY TWO FORMS

POLYMORPHISM IS A METHOD IN WHICH DIFFERENT INSTANCES OF AN OBJECT DISPLAYS DIFFERENT BEHAVIOR

POLYMORPHISM IS A METHOD IN WHICH DIFFERENT INSTANCES OF AN OBJECT DISPLAYS SAME BEHAVIOR

What is true regarding the User Datagram Protocol (UDP)?

Note: Select more than 1 option as correct answer

A MESSAGE IS NEVER PARTIAL

MESSAGES ORDER IS GUARANTEED

MESSAGES ARE NOT GUARANTEED TO ARRIVE AT DESTINATION

UDP IS MTU INDEPENDANT

What is the return type of the method ceil(double) from the Math class?

INT

FLOAT

DOUBLE

INTEGER

Which of the following is the correct syntax for suggesting that the JVM perform garbage collection?

SYSTEM.SETGARBAGECOLLECTION();

SYSTEM.OUT.GC();

SYSTEM.GC();

SYSTEM.FREE();

You want to loop through an array and stop when you come to the last element. Which of the following give information about the size of array, if its name is arMark?

ARMARK.SIZE

ARMARK.SIZE();

ARMARK.LENGTH;

ARMARK.LENGTH();

A method can be defined as native to:

Note: Select more than 1 option as correct answer

OVERCOME THE LIMITATION OF THE PRIVATE SCOPE OF A METHOD

GET TO ACCESS HARDWARE THAT JAVA DOES NOT KNOW ABOUT

WRITE OPTIMIZED CODE FOR PERFORMANCE IN A LANGUAGE SUCH AS C/C++

DEFINE A NEW DATA TYPE SUCH AS AN UNSIGNED INTEGER

Which of the following are not Java keyword?

STRICTFP

FOR

WAIT

WHILE

Which of the following are wrapper classes?

Note: Select more than 1 option as correct answer

JAVA.LANG.MATH

JAVA.LANG.BOOLEAN

JAVA.LANG.LONG

JAVA.LANG.FLOAT

Which of the following methods is used to get the parameters of an applet?

GETAPPLETCONTEXT()

GETAPPLETINFO()

GETPARAMETER()

GETPARAMETERS()

Which of the following is a benefit derived from using OOPS?

ELIMINATION OF REDUNDANT CODE

ABILITY TO ENHANCE AND EXTEND PREVIOUSLY WRITTEN CODE FOR NEW MODULES

CO-EXISTENCE OF MULTIPLE INSTANCES OF OBJECTS

ALL OF THE ABOVE

Which of the following cannot apply to constructors?

NAME SAME AS CLASS NAME

VOID RETURN TYPE

CAN HAVE PARAMETERS

OVERLOADING

What protocol is used by the DatagramSocket class?

STCP

UDP

TCP

FTP

Which class contains a method to create a directory?

FILE

DATAOUTPUT

Which of the following methods are members of the Vector class and allow you to input a new element?

ADDITEM

APPEND

INSERT

ADDELEMENT

One method in your application needs to be synchronized. Which of the following options are correct for synchronization?

Note: Select more than 1 option as correct answer

PUBLIC SYNCHRONIZED VOID PROCESS(VOID){}

PUBLIC VOID PROCESS(){ SYNCHRONIZED(THIS){ } }

PUBLIC VOID SYNCHRONIZED PROCESS(){}

PUBLIC SYNCHRONIZED VOID PROCESS(){}

Which of the following help increase the code clarity?

Note: Select more than 1 option as correct answer

INHERITANCE

POLYMORPHISM

ABSTRACTION

ENCAPSULATION

What is Encapsulation?

WRAPPING FUNCTIONS INTO A SINGLE UNIT

WRAPPING FUNCTIONS AND DATA INTO A SINGLE UNIT

MAKING THE WHOLE DATA ACCESSIBLE TO THE OUTER WORLD

MAKING THE WHOLE DATA AND FUNCTIONS ACCESSIBLE TO THE OUTER WORLD

Which of the following statements is not correct with regard to threads in Java?

A CALL TO THE WAIT METHOD CAUSES THE CALLING THREAD TO PAUSE ITS EXECUTION

THE WAIT AND NOTIFY METHODS ARE DEFINED IN THE THREAD CLASS

THE SYNCHRONIZED KEYWORD CAN BE APPLIED TO EITHER A METHOD OR A BLOCK OF CODE

ANY CODE THAT HAS CALLS TO THE WAIT OR NOTIFY METHODS MUST BE SYNCHRONIZED

Which of the following require explicit try/catch exception handling by the programmer?

Note: Select more than 1 option as correct answer

ACCESSING A METHOD IN ANOTHER CLASS

ATTEMPTING TO OPEN A NETWORK SOCKET

ATTEMPTING TO OPEN A FILE

TRAVERSING EACH MEMBER OF AN ARRAY

In which class is the notify method defined?

THREAD

APPLET

RUNNABLE

OBJECT

Which of the following are the methods of the Thread class?

Note: Select more than 1 option as correct answer

STAY()

GO()

YIELD()

SLEEP(LONG MILLIS)

What will be the output of the following line? System.out.println(Math.floor(-2.1));

-2

2.0

-3

-3.0

Which of the following methods will cause a thread to stop?

INVOKING THE INTERRUPT() OF THE THREAD

INVOKING THE SLEEP() METHOD ON THREAD

WHEN EXECUTION OF THE RUN() METHOD ENDS

NONE OF THE ABOVE

Which of these interfaces are used by implementations of models for JTable?

Note: Select more than 1 option as correct answer

TABLEMODEL

TABLECOLUMNMODEL

TABLESELECTIONMODEL

LISTMODEL

What is the method by which two or more applets can communicate with each other within one HTML page?

MULTIPLE APPLETS CANNOT COMMUNICATE WITH EACH OTHER WITHIN ONE HTML PAGE

GETCODEBASE()

GETDEFAULTCONTEXT()

GETAPPLETCONTEXT()

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Exam Type:	Java MCQ Skill Test
Questions Type:	Multiple Choice Questions
Total Questions:	32
Time Limit:	30 Minutes
Last Update	June, 2025

Pass Java Exam

Java Quiz

Which of the following statements are true about local inner class within a method?

What is the output of the given program? public class Test96 { public static void main(String[] args) { int[] a = new int[2]; System.out.println(a.length); } }

Which of the following statements about threading is incorrect?

What will the length() method in the File class return?

Choose the correct statement:

What is the superclass of java.net.DatagramSocket?

Which of the following statements is true of the HashMap class?

Which of the following statements are correct with regard to Polymorphism?

What is true regarding the User Datagram Protocol (UDP)?

What is the return type of the method ceil(double) from the Math class?

Which of the following is the correct syntax for suggesting that the JVM perform garbage collection?

You want to loop through an array and stop when you come to the last element. Which of the following give information about the size of array, if its name is arMark?

A method can be defined as native to:

Which of the following are not Java keyword?

Which of the following are wrapper classes?

Which of the following methods is used to get the parameters of an applet?

Which of the following is a benefit derived from using OOPS?

Which of the following cannot apply to constructors?

What protocol is used by the DatagramSocket class?

Which class contains a method to create a directory?

Which of the following methods are members of the Vector class and allow you to input a new element?

One method in your application needs to be synchronized. Which of the following options are correct for synchronization?

Which of the following help increase the code clarity?

What is Encapsulation?

Which of the following statements is not correct with regard to threads in Java?

Which of the following require explicit try/catch exception handling by the programmer?

In which class is the notify method defined?

Which of the following are the methods of the Thread class?

What will be the output of the following line? System.out.println(Math.floor(-2.1));

Which of the following methods will cause a thread to stop?

Which of these interfaces are used by implementations of models for JTable?

What is the method by which two or more applets can communicate with each other within one HTML page?

Java Test Explained