Java Programming MCQs SET-4

Q.61 The process that focuses on only important characteristics is known as:

• A) Encapsulation
• B) Polymorphism
• C) Abstraction
• D) Inheritance

Q.62 Which statement is true regarding an object:

• A) An object is of a class
• B) An object is an instance of a class
• C) An object is a variable
• D) An object is not an instance of class

Q.63 An object-oriented programming composition relates to:

• A) The use of consistent coding convection
• B) It refers to coherent, common, behavior
• C) It refers to procedural behavior
• D) None of these

Q.64 In object-oriented programming, new classes can be defined by extending existing classes through:

• A) Encapsulation
• B) Interface
• C) Composition
• D) Inheritance

Q.65 Given a class name Book, which one of these is a valid constructor declaration for the class:

• A) Book (Book b) {}
• B) Book Book ()
• C) Final Book ()
• D) Abstract Book ()

Q.66 The wrapping of data and functions into a single unit is called:

• A) Encapsulation
• B) Abstraction
• C) Data hiding
• D) Polymorphism

Q.67 Polymorphism is a characteristic of:

• A) JAVA language
• B) C language
• C) Cobol language
• D) None of the above

Q.68 The numerical range of a char data type in Java is:

• A) -128 to 127
• B) 0 to 256
• C) 0 to 32767
• D) 0 to 65535

Q.69 Which of the following events will cause a thread to die?

• A) The method sleep() is called
• B) The method wait() is called
• C) The execution of start() is called
• D) Execution of run() method is completed

Q.70 Which of the following is true regarding the finalize() method?

• A) It must only be declared with protected accessibility
• B) Finalize() method can be overloaded
• C) Finalize() method cannot be overloaded
• D) All of the above are true

Q.71 Which of the following is a valid method declaration in Java:

• A) void method 2
• B) int 1 method 1
• C) int method 3 () void
• D) void method ()

Q.72 The concept of multiple interface implementations is achieved in Java by:

• A) Extending two or more classes
• B) Extending one class and implementing interfaces
• C) Implementing inheritance
• D) Implementing thread

Q.73 The File class is included in which package?

• A) java.io
• B) java.lang
• C) java.awt
• D) java.util

Q.74 What is the sequence of major events in the life cycle of an applet:

• A) init, start, stop, destroy
• B) start, init, stop, destroy
• C) init, start, destroy
• D) init, destroy, stop

Q.75 Threading provides execution of:

• A) Only one module of the program at a time
• B) Only two modules of the program at a time
• C) All related program sub-blocks simultaneously
• D) None of the above

Q.76 Which of these operators is used to allocate memory to an array variable in Java?

• A) Malloc
• B) Alloc
• C) New
• D) New malloc

Q.77 Which one of the following class definitions is valid and cannot be extended?

• A) Final class link {}
• B) Static class link {}
• C) Abstract class link {}
• D) Class link {}

Q.78 Which statement is true about the accessibility of members?

• A) Private members are always accessible in the same package
• B) Private members are accessible in the class
• C) Private members are accessible outside the class
• D) None of these

Q.80 The field in an interface is implicitly specified as:

• A) Static only
• B) Protected
• C) Private
• D) Both static and final