Monday, 28 October 2013

Java Interview Questions - 5

Java Interview Questions

In our past post we have seen lot of Java interview question like programming. In this post lets see few multiple choice questions in Java. Lets get some basic knowledge on various topics in Java 

1. Enumeration doesn't have which of the following method?

a) Hasnext()
b) Next()
c) Both a & b
d) Remove()

2. The servlet handles zero or more client’s requests through which method?

a) Init()
b) Destroy()
c) Paint()
d) Service()

3. Which is an Interface that extends Serializable Interface?
a) Package
b) Classes
c) Externalizable
d) Abstract

4. Which of the following is a software component that has been designed to be reusable in a variety of different environments?
a) Jar file
b) Java bean
c) JVM
d) JDK

5. Which of the following is the software component that enables java application to interact with the database?
b) API
c) JDK

6. Who control the java collector?
a) Class
b) Java interface
c) Applets
d) JVM

7. Which allows null key and values?
a) Hashtables
b) Hashkeys
c) Hash set
d) Hash map

8. Which of the following is the JDBC driver?
a) AWT driver
b) Network protocol driver
c) JVM driver
d) JAR driver

9. Which method returns -1 when it has reached the end of a file?
a) Write()
b) Read()
c) Lock()
d) All the above

10. Which class of interface is used, where there is a collection with no duplicates and you don’t care about order when you iterate through it?
a) Tree set
b) Enum set
c) Hashset
d) Linked hashset

11. Which concept of object oriented programming helps you group features of an object?
a) Packages
b) Inheritance
c) Data abstraction
d) Expert system

12. Write down the syntax to set null layout?

a) SetLayout(null)
b) Layout(null)
c) Layout(set null)
d) Null layout

13. What is the base class of all the classes?
a) Java.lang
b) Java.object
c) Java.lang.object
d) Java.lang.class

Public class test {
static class innerclass { 
Public static void innermethod() {
System.out.ptintln("static inner class!";

Public static void main(string args[]) { 

14. What will be the output of the above program?
a) Static inner class
b) 16
c) 14
d) None of the above

15. The <an applet> tag enables to pass an applet parameter in an applet using which of the following tag?
a) Alt
b) Code
c) Align
d) Param

16. Which frees the memory occupies by the unreachable objects during the java program by deleting these unreachable objects?
a) Interface
b) JVM
c) Source code
d) Garbage collector

17. Which of the following modifier makes that the programmer cannot change the value anymore?
a) Protected
b) Private
c) Public
d) Final

18. Which of the following is the correct syntax to create static variable?
a) Type static <var>
b) Static <identifier> type
c) Static[] type <identifier>
d) Static type <identifier>

19. Which is a method of Object class which will be executed by the JVM just before garbage collecting object to give a final chance for resource?
a) String ()
b) Finalize()
c) Math()
d) Final()

20. Which of the following code shows how to call the garbage collector?
a) Get.gc()
b) Garbage collector()
c) Runtime.gc()
d) System.gc()

21. Which encapsulates the state changes in the event source?
a) Event source
b) Event object
c) Event listener
d) Event management

22. Which is the default layout of jpanel?
a) Text layout
b) Label layout
c) Frame layout
d) Flow layout

23. Which is the relationship between the two classes?
a) Encapsulation
b) Inheritance
c) Polymorphism
d) Association

24. Which is Set implementation to use with enum types?
b) Java.util.enumset
c) Enumset.util
d) Java.enum

25. Which method can be accessed by the classes within the same package or by the sub-classes of the class in any package?
a) Public
b) Protected
c) Private
d) Void

26. Which of the following view lets you navigate through the various files that make up an Eclipse project?
a) Problem view
b) Explorer view
c) Debug view
d) Java view

27. Which of the following is the king of bugs of java program?
a) Incorrect result
b) Program crashes
c) Both a & b
d) None of the above

28. Which of the following option Skips the highlighted statement and executes the next statement, and then suspends the thread?
a) Run to return
b) Step into
c) Step over
d) Resume

29. Which of the following element specified the element that can occur 1 or more times?
a) Element *
b) Element -
c) Element +
d) Element ?

30. Which is a control that the user can click to either check or uncheck?
a) Radio button
b) Check box
c) Drop down List
d) All the above

31. After you compile a Java program with no errors, you can run it by choosing which key combination?
a) Ctrl+f2
b) Ctrl+8
c) Ctrl+4
d) Ctrl+2

32. In Java, a _______ is a unit of code that can calculate and return a value?
a) Identifier
b) Method
c) Variable
d) Data

33. Which of the java compiler option specifies where to find input source files?
a) -d <directory>
b) -extdirs <dirs>
c) -classpath <path>
d) -sourcepath <path>

34. Which command is called the Java dis-assembler because it takes apart class files and tells you what’s inside them?
a) Javac
b) Java
c) Javap
d) Javah

35. Which is a name and value pair that’s written inside of the start tag for an element?
a) DTD
b) Script
c) Code
d) Attribute

36. Which is a read-only technique for processing XML that lets you read the elements of an XML document from a file and react to them as they come?
a) SAX
b) DOM
c) XML

37. _______spells out exactly what elements can appear in an XML document and in what order the elements can appear?
a) DOM
b) SAX
c) Validate form
d) DTD

38. Which of the following java command option displays the JRE version number, then stops?
a) -version
b) –verbose
c) –showversion
d) –server

39. Which of the following operator is used to compile all the files in a folder of java programs?
a) $
b) *
c) @
d) &

40. Which of the following performs calculations?
a) Expression statement
b) Variables
c) Keywords
d) Declaration statement

41. Which is a line in your program where you want the program to be suspended?
a) Breakpoint
b) Trace
c) Stepping
d) Debug

42. Which of the following is based on interfaces rather than classes?
a) XML
b) Javascript
c) ASP

43. Which is the basic Eclipse desktop environment?
a) editor
b) workbench
c) applets
d) javadoc

44. The text editor you wish to create the text files that contain your Java programs is called ______?
a) Source file
b) Destination file
c) Application file
d) System file

45. What is the size of offline version of java?
a) 100 gb
b) 45 mb
c) 90 mb
d) 150 mb

46. In text pad which is a collection of files that you work on together?
a) Preference
b) Javadoc
c) Applets
d) Workspace

47. Which method of the slider control sets the tool-tip text that’s displayed if the user rests the mouse over the slider for a few moments?
a) void setPaintLabels
b) void setToolTipText
c) setOrientation
d) void setMinimum()

48. Which document format that can be understood by most word processing programs?
a) JRE
b) RTF
c) Bin
d) Demo

49. Which is a group of one or more statements that’s enclosed in braces?
a) White space
b) Variable
c) Keyword
d) Blocks

50. When debugging is executing program statements one at a time is called _____?
a) Threads
b) Program crashes
c) Bugs
d) Stepping

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