Chapter 1 Flashcards
Java is platform neutral. What does that mean?
It can run without modification on different computing environments.
An approach to building computer programs that mimics how objects relate to each other in the real world is known as…
Object-oriented programming
A template used to create an object is called a…
Class
A self-contained element of a computer program that has certain attributes and can accomplish certain tasks is called an…
Object
In a class, attributes are defined using…
Variables
Variables that define an attribute of a particular object are called…
Instance variables, or object variables
Variables that have the same value in all objects of a class are called…
Class variables
The behavior that a class is capable of is defined by …
Methods
Groups of related statements in a class that perform a specific task are called…
Methods
How many tasks does a well-defined method typically perform?
One
What is the Java command for printing text and
moving to the next line?
System.out.println(“Text goes here”);
The mechanism that enables one class to possess all the behavior and attributes of another class is called…
Inheritance
A class that inherits from another class is called a…
Subclass
A class that passes its attributes and behavior to another class is called a
Superclass
At the top of the Java class hierarchy is the class called _____________
Object
If you create a new class that doesn’t indicate a superclass, Java assumes that the new class inherits directly from what superclass?
Object
When you invoke the method of a particular object, how does Java go about attempting to find it in the object hierarchy?
Java looks for the method in the current object. If it doesn’t find it, it moves up the class hierarchy until it finds it.
What does it mean to override a method?
Replacing the behavior defined in a method higher up the class hierarchy by creating a method that has the same name.
How many superclasses can a Java class have?
One.
This differs from some other languages, such as C++, which can have multiple superclasses.
A group of related classes and interfaces is called a ________________.
Package
What is the name of the package in which the class “java.lang.Object” is found?
java.lang
By default, objects in which Java package do NOT need to include a reference to the package?
java.lang
What command is used to import a package so that the classes in those packages can be referenced without including their package names?
import
When a Java class imports an entire package, does it increase the compiled size of that class?
No, the sole reason for using the import command is to eliminate the need to refer to the full package names in your code.
When you create a subclass, what must you define about that class?
Anything that is different from its superclass.
