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1000+ Java Programming Multiple Choice Question Answer [Solved]

Thursday 9th of March 2023

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1. 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
2. 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
3. The keywords reserved but not used in the initial version of Java re:
A. Synchronized
B. Boolean
C. union
D. goto
Answer : D
4. When present, package must be the first no comment statement in the file.
A. True
B. False
C.
D.
Answer : A
5. Which of the following classes are available in the java.lang package?
A. Random
B. Stack
C. String Buffer
D. Vector
Answer : A
6. 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
7. What does the following line of code do?
TextField text=new TextField(10);
A. Creates text object that can hold 10 rows of text.
B. Creates text object that can hold 10 columns of text.
C. Creates the object text and initializes it with the value 10.
D. The code is illegal.
Answer : B
8. 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
9. 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
10. The import statement is always the first no comment statement in a Java program files.
A. True
B. False
C.
D.
Answer : B
11. 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
12. 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
13. It is perfectly legal to refer to any instance variable inside of a static method.
A. True
B. False
C.
D.
Answer : B
14. EJBs can be of the following type(s)
None of the above
A. Entity Bean
B. Session Bean
C. Message-driven bean
D. All of the above
Answer : D
15. 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
16. Message-Driven beans act as a listener for the Java Message Service API, processing messages synchronously
A. True
B. False
C.
D.
Answer : B
17. The programmer must explicitly create the system .in and system .out objects.
A. True
B. False
C.
D.
Answer : B
18. 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
19. Every method of a final in class is implicitly final.
A. True
B. False
C.
D.
Answer : A
20. A variable declared inside the for loop control can not be referenced out side the loop.
A. True
B. False
C.
D.
Answer : A
21. It is perfectly legal to assign a subclass object to a supper class reference.
A. True
B. False
C.
D.
Answer : A
22. Declarations can appear anywhere in the body of a Java method.
A. True
B. False
C.
D.
Answer : A
23. Connection, Statement are interfaces and ResultSet is a class.
A. True.
B. False.
C.
D.
Answer : B
24. 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
25. Give file is a file object, which of the following are legal statements to create a new file.
A. file.create();
B. FileOutputStream fos=new FileOutputStream(file);
C. FileInputStream fis=new FileInputStream(file);
D. all of the above
Answer : B
26. 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
27. A class may be both abstract and final.
A. True
B. False
C.
D.
Answer : B
28. 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
29. All methods in an abstract class must be declared abstract.
A. True
B. False
C.
D.
Answer : B
30. 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
31. Members of a class specified as private are accessible only to the methods of the class.
A. True
B. False
C.
D.
Answer : A
32. Submit button always fires doPost(...)
A. True
B. False
C.
D.
Answer : B
33. We can add more than one class(es) at the time of compilation Java Beans.
A. True.
B. False.
C.
D.
Answer : A
34. When we invoke repaint () for a Component, the AWT invokes the method:
A. draw()
B. update()
C. show()
D. paint()
Answer : B
35. The length of a string object 's1' can be obtained using the expression s1.length.
A. True
B. False
C.
D.
Answer : B
36. A method declared as static can not access non-static class members.
A. True
B. False
C.
D.
Answer : A
37. Any method in a supper class can be over ridden in its subclass.
A. True
B. False
C.
D.
Answer : B
38. class.forName(...) creates an instance of java ODBC driver
A. True
B. False
C.
D.
Answer : A
39. An EJB is a server-side component that encapsulates the business logic of an application
A. True
B. False
C.
D.
Answer : A
40. Which of the following methods can be used to change the size of a
size() *
resize()
A. component
B. dimension()
C. setSize()
D. size()
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. 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
43. Objects are passed to a method by use of call-by-reference.
A. True
B. False
C.
D.
Answer : A
44. A catch can have comma-separated multiple arguments.
A. True
B. False
C.
D.
Answer : B
45. Frames and applets cannot be used together in the same program.
A. True
B. False
C.
D.
Answer : B
46. 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
47. 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
48. Which exception is thrown by the read() method of InputStream class?
A. IOException
B. FileNotFoundException
C. ReadException
D. None of the above
Answer : A
49. JSP files creates ________________
A. html files
B. html files and java files
C. java files and class files
D. None of the above.
Answer : C
50. JdbcOdbcDriver is an object of Object class
A. True
B. False
C.
D.
Answer : B
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