Software Dev Exam 2016 Flashcards
What is the size of a byte variable?
8 bits
What is the default value of a byte variable?
0
Which is true about the private access modifier?
Variables, methods and constructors which are declared private can only be accessed by the members of the same class.
What is an instance variable?
Instance variables are variables within a class but outside any method.
Which arithmetic operations can result in the throwing of an arithmetic exception?
/ & %
Which of the following is not a keyword in Java?
Seal
Which of the following is true about the public access modifier?
Variables, methods and constructors which are declared public can be accessed by any class lying in the same package.
What is the size of the char variable?
16 bits
Which method must be implemented by all threads?
Run()
What is the default value of short variable?
0
What is a class in Java?
A class is a blueprint from which individual objects are created. A class can contain fields and methods to describe the behavior of an object.
What is a class variable?
Class variables are variables declared within a class, outside any method, with the static keyword.
What is encapsulation?
It is the technique of making the fields in a class private and providing access to the fields via public methods. If a field is declared private, it cannot be accessed by anyone outside the class, thereby hiding the fields within the class. Therefore encapsulation is also referred to as data hiding.
What is an instance variable?
They are variables within a class but outside any method. These variables are instantiated when the class is loaded.
What is an applet?
An applet is a small internet based Java program that runs in a web browser.
What is polymorphism?
Polymorphism is the ability of an object to take on many forms. The most common use of polymorphism in OOP occurs when a parent class reference is used to refer to a child class object.
What is inheritance?
It is the process where one object acquires the properties of another. With the use of inheritance the information is made manageable in a hierarchical order.
What is a local variable?
Variables defined inside methods, constructors or blocks are called local variables. The variable will be declared and initialized within the method and it will be destroyed when the method has completed.
What is abstraction?
It refers to the ability to make a class abstract in OOP. It helps reduce the complexity and also improves the maintainability of the system.
What is JIT compiler?
JIT, which stands for Just In Time, improves the runtime performance of computer programs based on bytecode.
