EQuiz - Multiple Choice Quiz About JAVA

This article presents EQuiz - Multiple Choice Quiz About JAVA in a clear, structured format. It helps readers review key concepts, test their understanding, and learn from the material.

Understanding EQuiz

• 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.
  • L?i compilation
  • Runtime error
  • 3.5
  • 3
• Question 4. Result when compiling int a1 = 5; double a2 = (float) a1.
  • L?i compilation
  • Runtime error
  • Không l?i
• 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);}}
  • L?i compilation
  • Runtime Error
  • Runtime Exception
  • The result of b is 1
• }} class B extends A {}
  • L?i compile
  • Runtime Exception
  • Không l?i
• 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 l?i
• 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