Question 1: Which keyword is used to create a constant variable in Java?

• static
• final
• constant
• fixed

Question 2: What is the output of: System.out.println(5 / 2);

• 2.5
• 2
• 2.0
• 3

Question 3: Which of these is a valid method declaration?

• public void myMethod()
• public void myMethod();
• public void myMethod(){}
• public void MyMethod()

Question 4: What does JRE stand for?

• Java Runtime Environment
• Java Runtime Engine
• Java Resource Environment
• Java Runtime Extension

Question 5: Which operator is used for object comparison by reference?

• equals()
• ==
• compareTo()
• ===

Question 6: What is the purpose of an abstract class?

• To create final classes
• To prevent inheritance
• To provide partial implementation
• To create utility classes

Question 7: Which keyword is used to implement an interface?

• extends
• implements
• interface
• abstract

Question 8: What is method overloading?

• Same method name, different return types
• Same method name, different parameters
• Same method name in parent and child class
• Multiple methods with same signature

Question 9: Which concept is demonstrated when a Child class method overrides a Parent class method?

• Method overloading
• Method overriding
• Method hiding
• Method polymorphism

Question 10: What is the default access modifier for interface methods?

• private
• protected
• public
• default

Question 11: What is the output of: String str = null; System.out.println(str.length());

• 0
• 4
• null
• null

Question 12: How do you initialize an array of integers with values 1,2,3?

• int[] arr = {1,2,3};
• int[] arr = new int[1,2,3];
• int arr = [1,2,3];
• int[] arr = new int[]{1,2,3};

Question 13: Which String method compares strings ignoring case?

• equals()
• compareTo()
• equalsIgnoreCase()
• equalsIgnoreCase()

Question 14: What is the index of the first element in an array?

• 0
• 1
• -1
• first

Question 15: Which block must be accompanied by either catch or finally?

• try
• catch
• finally
• throw

Question 16: What is the parent class of all exceptions?

• Error
• RuntimeException
• Throwable
• Exception

Question 17: Which exception occurs when dividing by zero?

• NullPointerException
• ArithmeticException
• IllegalArgumentException
• DivisionException

Question 18: Which collection does NOT allow duplicate elements?

• ArrayList
• LinkedList
• HashSet
• Vector

Question 19: What is the purpose of generics in Java?

• Improve performance
• Provide type safety
• Reduce code size
• Enable multiple inheritance

Question 20: Which interface provides the compare() method for sorting?

• Comparable
• Comparator
• Sortable
• Orderable