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Section 1

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Variable declaration

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Java

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Date created

Mar 1, 2020

Cards (41)

Section 1

(41 cards)

Variable declaration

Front

Variables can be created by writing a __ _

Back

Constructor

Front

A ________ of a class is a special kind of method that is executed automatically whenever a new instance is created.

Back

Assignment statement (=)

Front

We can store values into variables by using an _

Back

Source code

Front

Every class is defined by a ________ this code defines what objects of this class can do. You can look at it by opening the class's editor

Back

Objects

Front

Many___ can be created from a class

Back

Variables

Front

______ can be used to store information (objects or values) for later use

Back

Commands

Front

Methods with void return types represent

Back

Void Return Type

Front

Calling a method with a _ _ ______ issues a command

Back

If/else statement

Front

The _/ _____ executes a segment of code when a given condition is true, and a different segment of code when it is false.

Back

Lifetime of instance variables

Front

Instance Variables that persist as long as the object exists to hold them

Back

Types

Front

Parameters and return have ____ Examples are int for numbers and Boolean for t/f values

Back

Questions

Front

Methods with non-void return types represent ______

Back

Error message

Front

When a class is compiled, the compiler checks to see whether there are any errors. If an error is found, an ______ is displayed.

Back

instance variables (fields)

Front

__ _ are variables that belong to an object (rather than a method)

Back

if statement

Front

An _____ can be used to write instructions that are only executed when a certain condition is true.

Back

Return type

Front

Of a method specifies what a method call will return

Back

Void

Front

A method with a ____ return type does not return a value

Back

Reference

Front

Objects are stored in variables by storing a ________ to the object

Back

New

Front

Java objects van be created programmatically (from within your code) by using the _____ keyword

Back

Lifetime of a local variable

Front

Logan variables persist only during a single method execution

Back

Object types

Front

Variables of _ store objects

Back

Equal

Front

We can test wheaten two things are _______ by using a double equal sign ==

Back

Actors

Front

Objects that can be placed into the world are known as ______

Back

Non-void return type

Front

Calling a method with a ________ _ ___ asks a question.

Back

Subclass

Front

Is a class that represents a specialization of another. In greenfoot, this is shown with an arrow in the class diagram

Back

Class methods

Front

Methods that belong to classes (as opposed to objects) are marked with the key word Static in their signature. They are also called _ ____

Back

method definition

Front

A _ ___ defines a new action for objects of this class. The action is not immediately executed, but the method can be called with a method call later to execute it.

Back

Comments

Front

_________ are written into the source code as explanations for human readers. They are ignored by the computer.

Back

Parameter

Front

Additional information can be passed to some methods with the parentheses. The value passed is called a ____________.

Back

Method call

Front

a _____________ is an instruction that tells an object to perform an action. The action is defined by a method of the object.

Back

Inherits

Front

A subclass _____ all the message from its superclass. That means that it has, and can use all methods that it's superclass defines.

Back

GreenfootImage

Front

Greenfoot actors maintain their visible image by holding an object of type GreenfootImage. These are stored in an instance variable inherited from class Actor.

Back

In sequence

Front

Multiple instructions are executed _________, one after the other, in the order in which they are written.

Back

API Documentation

Front

The _ _______ lists all classes and methods available in Greenfoot. We often need to look up methods here.

Back

Primitive Types

Front

Variables of ___ _ store numbers, Boolean, and characters;

Back

Companion

Front

Computers do not understand source code. It needs to be translated to a machine code before it can be executed.

Back

dot notation

Front

When a method we wish to call is not in our own class or inherited, we need to specify the class or object that has the method before the method name, followed by a dot. This is called _ _____

Back

Classes

Front

Greenfoot senarios consist of a set of

Back

Methods

Front

Objects have ___ invoking there performs an action

Back

Parameter

Front

Is a mechanism to pass additional data to a method

Back

Signature

Front

The specification of a method, which shows its return type, name and parameters

Back

Java

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Variable declaration

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Cards (41)

Variable declaration

Variables can be created by writing a ____________ ___________

Constructor

A ________ of a class is a special kind of method that is executed automatically whenever a new instance is created.

Assignment statement (=)

We can store values into variables by using an ________ _________

Source code

Every class is defined by a ________ this code defines what objects of this class can do. You can look at it by opening the class's editor

Objects

Many___ can be created from a class

Variables

______ can be used to store information (objects or values) for later use

Commands

Methods with void return types represent

Void Return Type

Calling a method with a _______ ___________ __________ issues a command

If/else statement

The ___/____ _______ executes a segment of code when a given condition is true, and a different segment of code when it is false.

Lifetime of instance variables

Instance Variables that persist as long as the object exists to hold them

Types

Parameters and return have ____ Examples are int for numbers and Boolean for t/f values

Questions

Methods with non-void return types represent ______

Error message

When a class is compiled, the compiler checks to see whether there are any errors. If an error is found, an ________ ______________ is displayed.

instance variables (fields)

__________ _________ are variables that belong to an object (rather than a method)

if statement

An __ _______ can be used to write instructions that are only executed when a certain condition is true.

Return type

Of a method specifies what a method call will return

Void

A method with a ____ return type does not return a value

Reference

Objects are stored in variables by storing a ________ to the object

New

Java objects van be created programmatically (from within your code) by using the _____ keyword

Lifetime of a local variable

Logan variables persist only during a single method execution

Object types

Variables of _________ ________ store objects

Equal

We can test wheaten two things are _______ by using a double equal sign ==

Actors

Objects that can be placed into the world are known as ______

Non-void return type

Calling a method with a __________ _____ _____ asks a question.

Subclass

Is a class that represents a specialization of another. In greenfoot, this is shown with an arrow in the class diagram

Class methods

Methods that belong to classes (as opposed to objects) are marked with the key word Static in their signature. They are also called _____ ________

method definition

A _____ _______ defines a new action for objects of this class. The action is not immediately executed, but the method can be called with a method call later to execute it.

Comments

_________ are written into the source code as explanations for human readers. They are ignored by the computer.

Parameter

Additional information can be passed to some methods with the parentheses. The value passed is called a ____________.

Method call

a _____________ is an instruction that tells an object to perform an action. The action is defined by a method of the object.

Inherits

A subclass _____ all the message from its superclass. That means that it has, and can use all methods that it's superclass defines.

GreenfootImage

Greenfoot actors maintain their visible image by holding an object of type GreenfootImage. These are stored in an instance variable inherited from class Actor.

In sequence

Multiple instructions are executed __ ___________, one after the other, in the order in which they are written.

API Documentation

The ___ _________ lists all classes and methods available in Greenfoot. We often need to look up methods here.

Primitive Types

Variables of _________ _______ store numbers, Boolean, and characters;

Companion

Computers do not understand source code. It needs to be translated to a machine code before it can be executed.

dot notation

When a method we wish to call is not in our own class or inherited, we need to specify the class or object that has the method before the method name, followed by a dot. This is called ___ _______

Classes

Variables can be created by writing a __ _

We can store values into variables by using an _

Calling a method with a _ _ ______ issues a command

The _/ _____ executes a segment of code when a given condition is true, and a different segment of code when it is false.

When a class is compiled, the compiler checks to see whether there are any errors. If an error is found, an ______ is displayed.

__ _ are variables that belong to an object (rather than a method)

An _____ can be used to write instructions that are only executed when a certain condition is true.

Variables of _ store objects

Calling a method with a ________ _ ___ asks a question.

Methods that belong to classes (as opposed to objects) are marked with the key word Static in their signature. They are also called _ ____

A _ ___ defines a new action for objects of this class. The action is not immediately executed, but the method can be called with a method call later to execute it.

Multiple instructions are executed _________, one after the other, in the order in which they are written.

The _ _______ lists all classes and methods available in Greenfoot. We often need to look up methods here.

Variables of ___ _ store numbers, Boolean, and characters;

When a method we wish to call is not in our own class or inherited, we need to specify the class or object that has the method before the method name, followed by a dot. This is called _ _____