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eQuiz - Multiple choice quiz about JAVA

  1. Question 1. What is the size of 1 Char?
    1. 4 bit
    2. 7 bit
    3. 8 bit
    4. 16 bit
  2. Question 2. 1 class cannot be declared in mode
    1. Static
    2. private
    3. Default
  3. Question 3. Results after compiling int a code = 3.5
    1. Lỗi compilation
    2. Runtime error
    3. 3.5
    4. 3
  4. Question 4. Result when compiling int a1 = 5; double a2 = (float) a1
    1. Lỗi compilation
    2. Runtime error
    3. Không lỗi
  5. Question 5. The result after compiling int a = 9/0 code
    1. Compilatinon error: The division calculation must be in the try syntax
    2. Compilation error: DivideByZeroException
    3. Runtime Exception
    4. No Error: The result is NaN
  6. Question 6. Result after compiling code: float a = 9/0
    1. Compilation error: The division calculation must be in the try syntax
    2. Compilation error: DivideByZeroException
    3. Runtime Exception
    4. No Error: The result is NaN
  7. Question 7. 1 Class can work in transient - transient mode
    1. It's correct
    2. False
  8. public static void main (String [] args) {System.out.println ('b is' + b);}}
    1. Lỗi compilation
    2. Runtime Error
    3. Runtime Exception
    4. The result of b is 1
  9. }} class B extends A {}
    1. Lỗi compile
    2. Runtime Exception
    3. Không lỗi
  10. Question 10. Results after compiling code: class A {public static void main (String [] args) {A a = new B ();}} class B extends A {}
    1. Error compiler
    2. Runtime Exception
    3. Không lỗi
  11. Question 11. Structured, protected syntax can be called in any subclass of that class
    1. It's correct
    2. False
  12. Question 12. A abstract class can use the syntax of non - abstract
    1. It's correct
    2. False
  13. Question 13. Java keywords are declared in lowercase as well as in capital letters
    1. It's correct
    2. False
  14. Question 14. What is the instanceof concept?
    1. Is the structure, command syntax in 1 object
    2. Is the operator structure and keywords
  15. Question 15. Primitive datatype is allocated based on stack
    1. It's correct
    2. False
  16. Question 16. Can compare boolean value with integer
    1. It's correct
    2. False
  17. Question 17. If class A works with the interface part, it must implement all the interfaces of that interface
    1. Yes, always like that
    2. No, unless that class A is abstract
  18. Verse 18. Integer a = new Integer (2); Integer b = new Integer (2). What happens if we apply if (a == b) syntax?
    1. Error compiler
    2. Runtime Exception
    3. It's correct
    4. False
  19. Question 19. Does wait (), notify () and notifyAll () structure in an object need to be called from the synchronized code?
    1. It's correct
    2. False
  20. Question 20. The Inner class can be initialized within the building blocks
    1. It's correct
    2. False
  21. Question 21. Synchronized is a keyword used to Thread choose any object that has been locked before continuing to execute the command
    1. It's correct
    2. False
  22. Question 22. The default switch syntax is always executed
    1. It's correct
    2. False
  23. Question 23. How to prevent 1 variable - variable becomes serialized - has serial capability
    1. Marked as private
    2. Marked as volatile
    3. Marked as transient
    4. It is impossible to do
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