Java Quiz

Java Quiz

Quiz

 

1. Java is a ________ language.
   1.   weakly typed
   2.   strongly typed
   3.   moderate typed
   4.   none
2. How many primitive data types are there in java?
   1.   6
   2.   7
   3.   8
   4.   9
3. Size of int in java is
   1.   16 bit
   2.   32 bit
   3.   64 bit
   4.   Depends on environment
4. Smallest integer type is__________ and its size is ______ bits.
   1.   short, 8
   2.   byte, 8
   3.   short, 16
   4.   byte, 16
5. In Java byte, short, int and long all of these are
   1.   signed
   2.   unsigned
   3.   both
   4.   none
6. In java arrays are
   1.   objects
   2.   object references
   3.   primitive data type
   4.   none
7. What will be the return type of a method that not returns any value?
   1.   void
   2.   double
   3.   int
   4.   none
8. Which of the following options is the best for generating random integer 0 or 1 ?
   1.   (int)Math.random()
   2.   (int)Math.random() + 1
   3.   (int)(Math.random() + 0.5)
   4.   (int)(Math.random() + 0.2)
9. What is Math.floor(3.6)?
   1.   3.0
   2.   3
   3.   4
   4.   4.0
10. The class at the top of exception class hierarchy is _______
    1.   Arthimetic Exception
    2.   Throwable
    3.   Object
    4.   Exception
11. In which of the following package Exception class exist?
    1.   java.util
    2.   java.file
    3.   java.io
    4.   java.lang
12. Exception generated in try block is caught in ______ block.
    1.   catch
    2.   throw
    3.   throws
    4.   finally
13. Which keyword is used to explicitly throw an exception?
    1.   try
    2.   throwing
    3.   catch
    4.   throw
14. Which exception is thrown when divide by zero statement executes?
    1.   Number Format Exception
    2.   Arthmetic Exception
    3.   Null Pointer Exception
    4.   none
15. System class is defined in______
    1.   java.util package
    2.   java.lang package
    3.   java.io package
    4.   none
16. Which of these classes defined in java.io and used for file-hanfling are abstract?
    1.   Input Stream
    2.   Print Stream
    3.   Reader
    4.   A and C
17. When comparing java.io.BufferedWriter and java.io.FileWriter, which capability exist as a method in only one of two?
    1.   closing the stream
    2.   flushing the stream
    3.   writing a line separator to the stream
    4.   none
18. Which of the following class definitions defines a legal abstract class?
    1.   class A { abstract void unfinished() { } }
    2.   class A { abstract void unfinished(); }
    3.   abstract class A { abstract void unfinished();}
    4.   public abstract class A { abstract void unfinished();}
19. Which of the following declares an abstract method in an java class?
    1.   public abstract method();
    2.   public abstract void method();
    3.   public void abstract Method();
    4.   public void method() {}
20. Which of the following statements regarding abstract classes are true?
    1.   An abstract class can be extended.
    2.   A subclass of a non-abstract superclass can be abstract.
    3.   A subclass can override a concrete method in a superclass to declare it abstract.
    4.   All of the above.

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