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Java Programming 1000+ MCQ with answer for SSC JHT

Thursday 9th of March 2023

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1. Submit button always fires doPost(...)
A. True
B. False
C.
D.
Answer : B
2. 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
3. An EJB is a server-side component that encapsulates the business logic of an application
A. True
B. False
C.
D.
Answer : A
4. Which of the following will produce a value of 10 if x = 9.7?
A. floor(x)
B. abs(x)
C. rint(x)
D. round(x)
Answer : D
5. DriverManager.getConnection("jdbc:odbc:dsn_name") method does not depend on the class.forName(...) method.
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. Members of a class specified as private are accessible only to the methods of the class.
A. True
B. False
C.
D.
Answer : A
8. Declaring a method synchronized guarantees that the deadlock cannot occur.
A. True
B. False
C.
D.
Answer : A
9. Frames and applets cannot be used together in the same program.
A. True
B. False
C.
D.
Answer : B
10. Which of the following methods can be used to draw the outline of a square?
A. fillRect()
B. drawLine()
C. drawString()
D. all of the above
Answer : B
11. A Java monitor must either extend thread class or implement Runnable interface.
A. True
B. False
C.
D.
Answer : B
12. The modulus operator (%) can be used only with Integer operands.
A. True
B. False
C.
D.
Answer : B
13. class.forName(...) creates an instance of java ODBC driver
A. True
B. False
C.
D.
Answer : A
14. Which of the following statements are true?
A. An abstract class may not have any final methods?
B. A final class may not have any abstracts methods.
C. Transient variables must be static.
D. all of the above
Answer : B
15. We can over load methods with differences only in their return type.
A. True
B. False
C.
D.
Answer : B
16. 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
17. Two methods cannot have the same name in Java.
A. True
B. False
C.
D.
Answer : B
18. When we implement the Runnable interface, we must define the method
A. start()
B. init()
C. runnable()
D. run()
Answer : D
19. 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
20. When X is a positive number the operations x>> 2 and x>>>2 both produce the same result.
A. True
B. False
C.
D.
Answer : A
21. Any method in a supper class can be over ridden in its subclass.
A. True
B. False
C.
D.
Answer : B
22. Declarations can appear anywhere in the body of a Java method.
A. True
B. False
C.
D.
Answer : A
23. The keywords reserved but not used in the initial version of Java re:
A. Synchronized
B. Boolean
C. union
D. goto
Answer : D
24. With javadoc, which of the following denotes a javadoc comment?
A. //#
B. /*
C. /**
D. //**
Answer : C
25. A thread can make second thread ineligible for execution by calling the suspend (-) method on second thread.
A. True
B. False
C.
D.
Answer : A
26. A static class method can be invoked by simply using the name of the method alone.
A. True
B. False
C.
D.
Answer : B
27. JdbcOdbcDriver is an object of Object class
A. True
B. False
C.
D.
Answer : B
28. The use of protected keyword to a member in a class will restrict its visibility as follows:
A. Visibility only in the class and its subclasses in the same package.
B. Visibility only inside the same package.
C. Visibility in all classes in the same package and subclasses in other packages.
D. Visibility only in the class where it is declared.
Answer : C
29. 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
30. Message-Driven beans act as a listener for the Java Message Service API, processing messages synchronously
A. True
B. False
C.
D.
Answer : B
31. A method declared as static can not access non-static class members.
A. True
B. False
C.
D.
Answer : A
32. Which of the following are keywords?
A. integer
B. default
C. Boolean
D. Object
Answer : B
33. Which of the following represent legal flow control statements?
A. break;
B. break();
C. continue(inner);
D. all of the above
Answer : A
34. Which key word can protect a class in package from accessibility by the classes outside the package?
A. private
B. protected
C. final
D. don't use any keyword at all(make it default)
Answer : D
35. 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
36. Which of the following statements are valid array declarations?
A. int number();
B. float average[];
C. double[] marks;
D. counter int[];
Answer : B
37. In RMI we invoke client method from remote server
A. True
B. False
C.
D.
Answer : B
38. 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
39. In the code below, what data types the variable x can have?
A. byte b1 = 5;
B. byte b2 = 10;
C. x = b1 * b2;
D. int short
Answer : D
40. The programmer must explicitly create the system .in and system .out objects.
A. True
B. False
C.
D.
Answer : B
41. It is an error if a class with one or more abstract methods is not explicitly declared abstract.
A. True
B. False
C.
D.
Answer : A
42. 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
43. To delete a file, we can use an instance of class file.
A. True
B. False
C.
D.
Answer : A
44. Every call to wait has a corresponding call to notify that will eventually end the wafting.
A. True
B. False
C.
D.
Answer : A
45. Which of the following are the wrapper classes?
A. Random
B. Vector
C. Byte
D. all of the above
Answer : C
46. 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
47. Which javadoc tag is used to denote a comment for methods parameters?
A. @method
B. @parameter
C. @argument
D. @param
Answer : D
48. When present, package must be the first no comment statement in the file.
A. True
B. False
C.
D.
Answer : A
49. Which exception is thrown by the read() method of InputStream class?
A. IOException
B. FileNotFoundException
C. ReadException
D. None of the above
Answer : A
50. For all insert, update, delete, query operations on a database, ResultSet object creation is mandatory.
A. True.
B. False.
C.
D.
Answer : B
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