Java OOP principles Summative test

Indicate if the following lines of codes are legal or illegal. If legal select the resulting value. If illegal select Error.

String hello = new String("Hello world!");

int len = hello.length();

• legal

• 11

• illegal

• Error

interface and implement keywords should be used side by side to run the program with abstraction.

• True

• False

which keyword is used in a program to set the variable or identifier's value fixed?

• constant

• const

• cons

• consts

When a derived class is defined it also has all the attributes and methods of the base class

• Polymorphism

• Encapsulation

• Inheritance

The ability of a programming language to process objects differently  depending on their class.

• Inheritance

• Encapsulation

• Polymorphism

An object's attributes are contained in the object and access to them is restricted to operations of that class

• Inheritance

• Polymorphism

• Encapsulation

The process of creating an actual named instance of class.

• Instantiation

• Overrriding

• Method

• Attribute

What are the three access modifiers?

• Private

  Protected

  Public

• Private

  Protect

  Public

• Private

  Protects

  Static

• Main

  Protected

  Public

A method in a subclass or derived class which has the same name as a method in one or more of its superclass

• Instantiation

• Method

• Attribute

• Overrriding

A program routine contained within an object designed to perform a particular task on the data within the object

• Method

• Attribute

• Overrriding

• Instantiation