Which of these is used to compile Java code?

• javac
• java
• javadoc
• javap

Which of the following is not a Java feature?

• Object-oriented
• Platform independent
• Use of pointers
• Robust

Which keyword is used to define a class in Java?

• object
• def
• class
• new

What is the default value of an int variable in Java?

• 0
• null
• 1
• undefined

Which of the following is a valid identifier in Java?

• 2value
• value_2
• value-2
• value 2

Which concept allows multiple methods with the same name but different parameters?

• Inheritance
• Polymorphism
• Overloading
• Overriding

Which access modifier makes a member visible only within its package?

• public
• protected
• private
• default

Which interface does HashMap implement?

• List
• Map
• Set
• Queue

Which collection does not allow duplicate elements?

• List
• Map
• Set
• Queue

Which class is immutable in Java?

• String
• StringBuilder
• StringBuffer
• ArrayList

Which method in Object class is used for garbage collection request?

• delete()
• dispose()
• finalize()
• collect()

Which API is used for functional-style operations in Java?

• Collections API
• Stream API
• IO API
• Thread API

Which keyword is used to define a lambda expression parameter type explicitly?

• val
• var
• explicit
• No keyword required

Which of these is not a state of a thread?

• Running
• Waiting
• Sleeping
• Terminated

Which collection class is best suited for implementing LRU cache?

• HashSet
• LinkedHashMap
• TreeMap
• Vector