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eQuiz - Multiple choice quiz about JAVA

Following are multiple-choice questions related to JAVA programming language, there will be 23 questions in total with no answer for each time. Let's get started!

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

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Kareem Winters

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Kareem Winters
Update 24 May 2019

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