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1000+ Java Programming Multiple Choice Question Answer [Solved]

Thursday 9th of March 2023

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1. The import statement is always the first no comment statement in a Java program files.
A. True
B. False
C.
D.
Answer : B
2. Java always provides a default constructor to a class.
A. True
B. False
C.
D.
Answer : B
3. The name of the RMI compiler is ___________
A. rmicom
B. rmic
C. jrmi
D. none of the above
Answer : B
4. Consider the following class definition.
Class Student extends String
{
}
What happens when we try to compile this class?
A. Will not compile because class body is not defined
B. Will not compile because class is not declared public
C. Will compile successfully.
D. Will not compile because String is abstract
Answer : D
5. It is an error to have a method with the same signature in both the super class and its subclass.
A. True
B. False
C.
D.
Answer : B
6. The check box group class is a subclass of the component class.
A. True
B. False
C.
D.
Answer : B
7. Which of the following keywords are used to control access to a class member?
A. default
B. protected
C. interface
D. None of the above
Answer : B
8. The methods wait() and noify() are defined in
A. java.lang.Thread
B. java.lang.Runnable
C. java.lang.Object
D. java.lang.ThreadGroup
Answer : C
9. Submit button always fires doPost(...)
A. True
B. False
C.
D.
Answer : B
10. With javadoc, which of the following denotes a javadoc comment?
A. //#
B. /*
C. /**
D. //**
Answer : C
11. What is wrong in the following class definitions? 
abstract class print { 
abstract show();
} 
class Display extends print {
}
A. Nothing is wrong
B. Wrong Method show() should have a return type
C. Wrong Methods show() is not implemented in Display
D. Wrong Display does not contain any members.
Answer : C
12. The concept of multiple inheritance is implemented in Java by
A. extending two or more classes
B. extending one class and implementing one or more interfaces
C. all the above
D.
Answer : B
13. Servlet has ___________
A. init method
B. doGet(------) method
C. All of the above methods.
D.
Answer : C
14. A variable declared inside the for loop control can not be referenced out side the loop.
A. True
B. False
C.
D.
Answer : A
15. If a=10 and b= 15, then the statement x =(a>b)?a:b; assigns the value 15 to x.
A. True
B. False
C.
D.
Answer : A
16. Consider the following code snippet: 
try 
{
int x=0; int y=50/x; 
System.out.println("Division by zero"); 
}
catch(ArithmeticException e) 
{
System.out.println("catch block");
}

What will be the output?
A. Error. Won't compile
B. Division by zero
C. Catch block
D. Division by zero catch block
Answer : C
17. All the bitwise operators have the same level of precedence in Java.
A. True
B. False
C.
D.
Answer : A
18. An EJB is a server-side component that encapsulates the business logic of an application
A. True
B. False
C.
D.
Answer : A
19. What is java -g used for?
A. Using the jdb tool
B. Executing a class with optimization turned off
C. To provided information about deprecated methods
D. Non of the above
Answer : B
20. Which of the following statements are true?
A. UTF characters are all 24 bits.
B. Reader class has methods that can read integers and floats.
C. Unicode characters are all 16 bits.
D. all of the above
Answer : C
21. A catch can have comma-separated multiple arguments.
A. True
B. False
C.
D.
Answer : B
22. executeUpdate automatically updates data because___________
A. auto commit is on, by default
B. It performs a hidden commit statement as well
C. Does not commit
D. None of the above.
Answer : A
23. In a single Servlet class we can use____________
A. doGet(...) method only
B. doPost(...) method only
C. doGet(...) method and doPost(...) method both at a time.
D. Either 'a' or 'b'
Answer : C
24. The expression (x == y && a<b) is true If either x == y is true or a<b is true.
A. True
B. False
C.
D.
Answer : B
25. DataInput is
A. An abstract class defined is java.io.
B. A class we can use to read primitive data types.
C. An interface that defines methods to open files.
D. An interface that defines methods to read primitive data types.
Answer : D
26. Connection, Statement are interfaces and ResultSet is a class.
A. True.
B. False.
C.
D.
Answer : B
27. Which of the following classes are available in the java.lang package?
A. Random
B. Stack
C. String Buffer
D. Vector
Answer : A
28. Which are the valid ways to create DataInputStream streams?
A. new DataInputStream(new File("in.dat"));
B. new DataInputStream(new FileInputStream("in.dat"));
C. new DataInputStream("in.dat");
D. new DataInputStream("in.data","r");
Answer : B
29. When we implement an interface method, it should be declared as public.
A. True
B. False
C.
D.
Answer : A
30. If you want to assign a value of 99 to the variable year, then which of the following lines can be used within an <applet> tags?
A. number=getParameter(99)
B. <number==99>
C. D. <param = radius value ==99>
Answer : C
31. The default case is always required in the switch selection structure.
A. True
B. False
C.
D.
Answer : B
32. Frames and applets cannot be used together in the same program.
A. True
B. False
C.
D.
Answer : B
33. If m and n are int type variables, what will be the result of the expression
'm % n' when m = -14 and n = -3?
A. 4
B. 2
C. -2
D. -4
Answer : C
34. It is perfectly legal to assign a subclass object to a supper class reference.
A. True
B. False
C.
D.
Answer : A
35. Which of the following string can be used as mode string for creating a RandomAccessFile object?
A. "rw"
B. "wr"
C. "0"
D. 'w''
Answer : A
36. Every method of a final in class is implicitly final.
A. True
B. False
C.
D.
Answer : A
37. class.forName(...) creates an instance of java ODBC driver
A. True
B. False
C.
D.
Answer : A
38. Consider the following statements: 
int x = 10, y = 15; 
x = ((x < y) ? (y + x) : (y - x);

What will be the value of x after executing these statements?
A. 25
B. 15
C. 5
D. Error can't be executed.
Answer : A
39. In RMI before running the client program we must start RMI Registry.
A. True.
B. False.
C.
D.
Answer : A
40. Which of the following represent legal flow control statements?
A. break();
B. continue(inner);
C. return;
D. exit();
Answer : C
41. We would like to make a member of a class visible in all subclasses regardless of what package they are in. Which one of the following keywords would achieve this?
A. private
B. protected
C. public
D. private protected
Answer : D
42. putValue(...) method takes _____________________-
A. Two arguments of object type
B. First one is of a character type and second one is of an object type
C. First one is of an object type and second one is of a character type
D. None of the above.
Answer : A
43. What is error in the following class definitions? 
abstract class xy { 
abstract sum(int x, int y) {
} 
}
A. class header is not define properly
B. constructor is no defined
C. method is not defined properly
D. no error
Answer : C
44. Consider the following class definitions:
 class maths { 
student student1; 
} 
class student { 
String name; 
}

This code represents:
A. an 'is a' relationship
B. a 'has a' relationship
C. both
D. neither
Answer : B
45. Declaring a method synchronized guarantees that the deadlock cannot occur.
A. True
B. False
C.
D.
Answer : A
46. The programmer must explicitly create the system .in and system .out objects.
A. True
B. False
C.
D.
Answer : B
47. forName() is a static factory method
A. True
B. False
C.
D.
Answer : A
48. The setBackground() method is part of the class
A. Applet
B. Component
C. Container
D. Object
Answer : B
49. Which of the following methods can be used to remove a component from the display?
A. remove()
B. desappear()
C. hide()
D. move()
Answer : C
50. JdbcOdbcDriver is an object of Object class
A. True
B. False
C.
D.
Answer : B
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