Comprog 2nd sem (prelims) BSIT 205

Xai Alexandrei Delos Reyes · 58問 · 2年前

通報

問題一覧

It is a programming methodology that defines objects whose behaviors and interactions accomplish a given task.

Object-oriented Programming

An import statement must only contain small letters

True

A class from a different package has to be in the same folder with the class that we will use it

True

This allows objects of a class to acquire the properties of objects from another class

Inheritance

Which of the Following import statement is correct?

import java.util;

Which of the following keywords indicates that an interface will be used?

implements

The data type of an object is the name of its class.

True

This contains the heading for a number of public methods

Interface

Class that are grouped together form an interface

False

It serves a blueprint for defining Objects

Class

You can use a class from a package without. specifying the class name in the import statement.

True

This is the process of combining data and actions into a single item.

Encapsulation

Local Variables are only visible to the methods in which they declared

True

The accessor changes the data stored in a private instance variable

True

If a method definition is private, the method can be invoked to within the definitions of methods in its class

False

These are variables declared within a method definition.

Local

The data type of the return value should match the declared return type

True

A private method can be invoked anywhere without restriction

False

These are variables declared outside any method

Instance

Which of the following keywords indicates that the method is NOT used in returning a value

void

Which of the following keywords represents the object's name recieving the method call

this

Static variables are always private

False

What is the constructor of the class name NewClass

NewClass()

Methods can have the same name within the same class

True

The name of the constructor is the same with the name of the class

True

What is the variable ans upon executing the statement, double ans = Math.floor(7.9)?

7.0

What is the variable ans upon executing the statement, double ans = Math.abs(7.7)?

7.7

Which of the following is a valid statement

MyClass m = new MyClass();

What is the variable ans upon executing the statement, double ans = Math.ceil(7.4)?

8.0

A constructor has a return type

False

A static variable can reference an instance variable of the class

False

A derived class inherits the constructor of the base class

False

An abstract class should always have an abstract method

False

An abstract class can be instantiated

False

In the class declaration, public class ABC Extends Xyz, the subclass is ABC while the superclass is Xyz

True

It is a public method that returns data from a private instance variable

Accessor

It is a public method that changes the data stored in one (1) or more private instance variable

Modifier

It describes the structure of a class by displaying the class name (first row), variables (second row), and methods (third row).

Unified Modelling Language

The existing class that the derived class is built upon is called the...

Base Class

This class is defined by adding instance variables and methods to an existing class.

Derived Class

It is the ability of an object to take on many forms.

Polymorphism

It allows many meanings to be associated to one method name.

Dynamic Binding

It is declared as abstract and does not have an implementation. This is written without braces, followed by a semicolon.

Abstract Method

If a derived class defines a method with the same name, the same number and types of parameters, and the same return type as a method in the base class, the definition in the derived class is said to...

Override

The actions that an object can take are called

Behaviours

An object has characteristics or attributes.

True

To apply inheritance between classes, the ____ keyword is used.

extends

it is a collection of related classes and interfaces that have been grouped together into a folder.

Package

You can use all the classes that are in a package within any program or class definition by placing an ____ statement.

import

It is the list of variables in a method declaration

Parameters

It is the actual value that is passed when the method is invoked.

Arguments

It is a collection of statements that are grouped together to perform an operation.

Method

It is the mechanism for restricting access to some of the object’s components.

Information Hiding

If an instance variable is public, there are NO RESTRICTIONS on where you can use its name.

True

If an instance variable is private, its name CAN be used to access it outside of the class definition.

False

If a method definition is private, the method CANNOT be invoked within the definitions of methods in its class.

True

If the method is public, you CANNOT invoke it anywhere without restriction.

False

The address of the object’s memory location is called a...

Reference

It occurs when multiple methods have the same name within the same class.

Overloading

A method’s name and the number and types of its parameters are called the method’s...

Signature

A variable that is accessible to any class

Public Class

A variable that is only accessible only within the class where it is declared

Private Class

A modifier used to prevent a class from being inherited

Final

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