Java Question Bank Objective Q&A

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1. Which class cannot be subclassed (or extended) in java?

1. abstract class
2. parent class
3. Final class
4. None of above

Answer: 3

2. Can we declare abstract static method

1. Yes
2. No

Answer: 2

3. pow () is associated with which class

1. Math class
2. Input stream class
3. Object class
4. None of above

Answer: 1

4. Program which executes applet is known as

1. applet engine
2. virtual machine
3. JVM
4. None of above

Answer: 1

5. Suspend thread can be revived by using

1. start() method
2. Suspend() method
3. resume() method
4. yield() method

Answer: 3

6. Runnable is

1. Class
2. Method
3. Variable
4. Interface

Answer: 4

7. Which collection class associates values witch keys, and orders the keys according to their natural order

1. java.util.HashSet
2. java.util.LinkedList
3. java.util.TreeMap
4. java.util.SortedSet

Answer: 3

8. Which method is used to perform DML statements in JDBC

1. execute()
2. executeUpdate()
3. executeQuery()
4. None of above

Answer: 2

9. Which of the following statements about arrays is syntactically wrong

1. arrayName[] p = new arrayName[5];
2. arrayName p[5];
3. arrayName[] p [];
4. arrayName p[][] = new arrayName[2][];

Answer: 2

10. Session beans are created by the client submitting the query to the database

1. True
2. False

Answer: 1


11. Which methods are utilised to control the access to an object in multi threaded programming

1. ASynchronised methods
2. Synchronised methods
3. Serialised methods
4. None of above

Answer: 2

12. In Runnable, many threads share the same object instance

1. True
2. False

Answer: 1

13. Java beans have no types

1. True
2. False

Answer: 1

14. Why we use array as a parameter of main method

1. it is syntax
2. Can store multiple values
3. Both of above
4. None of above

Answer: 2

15. Which statement is static and synchronised in JDBC API

1. executeQuery()
2. executeUpdate()
3. getConnection()
4. prepareCall()

Answer: 3

16. The JDBC-ODBC bridge is

1. Multi-threaded
2. Single-threaded
3. Both of above
4. None of above

Answer: 1

17. All raw data types should be read and uploaded to the database as an array of

1. int
2. char
3. Boolean
4. byte

Answer: 4

18. The class java.sql.Timestamp is associated with

1. java.util.Time
2. java.sql.Time
3. java.util.Date
4. None of above

Answer: 3

19. Which of the following below are valid isolation levels in J2EE

1. TRANSACTION_READ_UNCOMMITTED
2. TRANSACTION_SERIALIZABLE
3. Only A
4. Both A and B

Answer: 4

20. The Externalise interface extends the serialise interface

1. True
2. False

Answer: 1

21. Converting a primitive type data into its corresponding wrapper class object instance is called

1. boxing
2. wrapping
3. instantiation
4. autoboxing

Answer: 4

22. Package of drawstring() method is

1. java.applet
2. java.io
3. javax.swing
4. java.awt

Answer: 4

23. Which method executes only once

1. start() method
2. init() method
3. stop() method
4. destroy() method

Answer: 2

24. Object which can store group of other objects is called

1. Collection object
2. Java object
3. Package
4. Wrapper

Answer: 1

25. All collection classes are available in

1. java.io package
2. java.lang package
3. java.awt package
4. java.util package

Answer: 4

26. Thread class is available in

1. java.io package
2. java.lang package
3. java.awt package
4. java.util package

Answer: 2

27. Minimum threads in a program are

1. 1
2. 2
3. 5
4. Many

Answer: 1

28. JIT meaning

1. java in time
2. just in time
3. join in time
4. none of above

Answer: 2

29. After the compilation of the java source code, which file is created by the JVM

1. .class
2. .java
3. .cdr
4. .doc

Answer: 1

30. Can we access private class outside the package

1. Yes
2. No

Answer: 2

31. Constructor has return type

1. True
2. False

Answer: 2

32. x=x+1 is equivalent to

1. ++x
2. x++
3. x=x-1
4. None of these

Answer: 2

33. If method have same name as class name and method don’t have any return type then it is known as

1. Destructors
2. Object
3. Variable
4. Constructor

Answer: 4

34. Methods that have same name, but different Parameter list and different definition known as

1. Overriding
2. Constructor
3. Overloading
4. none of these

Answer: 3

35. Inheritance means

1. Sub class extends super class
2. Sub class extends Base class
3. Sub class create object of super class
4. All of the above

Answer: 1

36. Which type of inheritance is not supported by java

1. Single
2. Multiple
3. Multilevel
4. Hierarchical

Answer: 2

37. String is the predefined

1. Method
2. Class
3. Variable
4. Object

Answer: 2

38. Super is the predefined

1. Keyword
2. Method
3. Keyword and Method
4. None of above

Answer: 3

39. Execution of the program is always begins with

1. Main method
2. class contain main method
3. parent class
4. default package

Answer: 1

40. All methods of interface are public and abstract

1. True
2. False

Answer: 1