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Презентация на тему 4. Java OOP. 5. Abstract Classes

Содержание

2. Abstract ClassesAn abstract class is a class
3. Abstract Methods An abstract method is a
4. An Abstract Classes IIA subclass of an
5. Example: Abstract DepoBase ClassModify 442InterestSum project using DepoBase as an abstract class.*Infopulse Training CenterSum = 1763.41
6. Example: Abstract DepoBase ClassSee 451AbstractDepo project for the full text*Infopulse Training Center
7. How to Create and Use LibraryTo create
8. InterfacesAn interface is a reference type, similar
9. Defining an InterfaceAn interface declaration consists of:
10. Interface Definition Examplepublic interface GroupedInterface extends Interface1,
11. The Interface BodyThe interface body contains method
12. Use an InterfaceTo use an interface, you
13. Interfaces and Multiple InheritanceIn Java, a class
14. Using an Interface as a TypeYou can
15. Exercise: InterestInterfaceModify 442InterestSum project using interface*Infopulse Training Center
16. Exercise: InterestInterfaceSee 452InterfaceDepo project for the full text*Infopulse Training Center
17. Cloning (1 of 2)Use clone() method to
18. Cloning (2 of 2)The clone method is
19. Deep CloningTo make a deep copy, you
20. Example: DepoBase Cloningpublic abstract class DepoBase implements
21. Interfaces in Java SE 8The interface body
22. Interface Default MethodsYou specify that a method
23. Exercise: Default MethodModify 452InterfaceDepo project:Remove abstract DepoBase
24. Exercise: Default MethodSee 453DefaultMethod project for the full text
25. Functional InterfacesA functional interface is any interface
26. Lambda ExpressionA lambda expression looks a lot
27. Example of Lambda Expression Ipublic class Calculator
28. Example of Lambda Expression II public
29. Example of Lambda ExpressionSee 454LambdaCalulator for the full text
30. Lambda Expression Syntax IA lambda expression consists
31. Lambda Expression Syntax IIYou can omit the
32. Скачать презентацию
33. Похожие презентации

Abstract ClassesAn abstract class is a class that is declared abstractAbstract classes cannot be instantiated, but they can be subclassed*Infopulse Training Center

4. Java OOP 5. Abstract Classes. Interfaces

Abstract Methods An abstract method is a method that is declared without

An Abstract Classes IIA subclass of an abstract class usually provides implementations

Example: Abstract DepoBase ClassModify 442InterestSum project using DepoBase as an abstract class.*Infopulse Training CenterSum = 1763.41

Example: Abstract DepoBase ClassSee 451AbstractDepo project for the full text*Infopulse Training Center

How to Create and Use LibraryTo create depo library:Right click on the

InterfacesAn interface is a reference type, similar to a class, that can

Defining an InterfaceAn interface declaration consists of: modifiers the keyword interface the

Interface Definition Examplepublic interface GroupedInterface extends Interface1, Interface2, Interface3 {

The Interface BodyThe interface body contains method declarations for all the methods

Use an InterfaceTo use an interface, you write a class that implements

Interfaces and Multiple InheritanceIn Java, a class can inherit from only one

Using an Interface as a TypeYou can use interface names anywhere you

Exercise: InterestInterfaceModify 442InterestSum project using interface*Infopulse Training Center

Exercise: InterestInterfaceSee 452InterfaceDepo project for the full text*Infopulse Training Center

Cloning (1 of 2)Use clone() method to get independent object instead of

Cloning (2 of 2)The clone method is a protected method of Object,

Deep CloningTo make a deep copy, you have clone the mutable instance

Example: DepoBase Cloningpublic abstract class DepoBase implements Cloneable{ . .

Interfaces in Java SE 8The interface body can contain:abstract methods (followed by

Interface Default MethodsYou specify that a method definition in an interface is

Exercise: Default MethodModify 452InterfaceDepo project:Remove abstract DepoBase classAdd calculateInterest method as default

Exercise: Default MethodSee 453DefaultMethod project for the full text

Functional InterfacesA functional interface is any interface that contains only one abstract method

Lambda ExpressionA lambda expression looks a lot like a method declarationYou can

Example of Lambda Expression Ipublic class Calculator { interface IntegerMath { int

Example of Lambda Expression II public static void main(String... args) {

Example of Lambda ExpressionSee 454LambdaCalulator for the full text

Lambda Expression Syntax IA lambda expression consists of the following: a comma-separated

Lambda Expression Syntax IIYou can omit the data type of the parameters

Manualshttp://docs.oracle.com/javase/tutorial/java/IandI/index.html*Infopulse Training Center

Слайды презентации

Слайд 2 Abstract Classes
An abstract class is a class that

Abstract ClassesAn abstract class is a class that is declared abstractAbstract

is declared abstract
Abstract classes cannot be instantiated, but they

can be subclassed

Infopulse Training Center

Слайд 3 Abstract Methods
An abstract method is a method

Abstract Methods An abstract method is a method that is declared

that is declared without an implementation:
abstract void moveTo(double deltaX,

double deltaY);
If a class includes abstract methods, the class itself must be declared abstract

Infopulse Training Center

Слайд 4 An Abstract Classes II
A subclass of an abstract

An Abstract Classes IIA subclass of an abstract class usually provides

class usually provides implementations for all of the abstract

methods in its parent class
If it does not, the subclass must also be declared abstract
Abstract classes can contain fields and implemented methods (partial implementation)
An abstract class may have static fields and static methods. You can use these static members with a class reference as you would with any other class

Infopulse Training Center

Слайд 5 Example: Abstract DepoBase Class
Modify 442InterestSum project using DepoBase

as an abstract class.
*
Infopulse Training Center
Sum = 1763.41

Слайд 6 Example: Abstract DepoBase Class
See 451AbstractDepo project for the

full text

*
Infopulse Training Center

Слайд 7 How to Create and Use Library
To create depo

How to Create and Use LibraryTo create depo library:Right click on

library:
Right click on the app package -> Export ->

Java -> JAR file -> Next
JAR file = depo.jar
Finish
How you can use depo.jar library:
Create new project 451aAbstractDepo
Right click on the project name -> Build Path
-> Configure Build Path
Go to Library tab -> Add External JARs -> find and click on depo.jar -> Open -> Ok

Слайд 8 Interfaces
An interface is a reference type, similar to

InterfacesAn interface is a reference type, similar to a class, that

a class, that can contain only constants, method signatures,

and nested types
There are no method bodies
Interfaces cannot be instantiated—they can only be implemented by classes or extended by other interfaces

Infopulse Training Center

Слайд 9 Defining an Interface
An interface declaration consists of:
modifiers

Defining an InterfaceAn interface declaration consists of: modifiers the keyword interface

the keyword interface
the interface name
a comma-separated list

of parent interfaces (if any)
the interface body
An interface can extend any number of interfaces

Infopulse Training Center

Слайд 10 Interface Definition Example
public interface GroupedInterface extends
Interface1, Interface2,

Interface3 {
// constant declarations
double

E = 2.718282;
// method signatures void doSomething (int i, double x);
int doSomethingElse(String s);
}

Infopulse Training Center

Слайд 11 The Interface Body
The interface body contains method declarations

The Interface BodyThe interface body contains method declarations for all the

for all the methods included in the interface
A method

declaration within an interface is followed by a semicolon, but no braces
All methods declared in an interface are implicitly public
An interface can contain constant declarations in addition to method declarations
All constant values defined in an interface are implicitly public, static, and final

Infopulse Training Center

Слайд 12 Use an Interface
To use an interface, you write

Use an InterfaceTo use an interface, you write a class that

a class that implements the interface
When an instantiable class

implements an interface, it provides a method body for each of the methods declared in the interface
public class OperateBMW760i implements GroupedInterface {
. . . .
}

Infopulse Training Center

Слайд 13 Interfaces and Multiple Inheritance
In Java, a class can

Interfaces and Multiple InheritanceIn Java, a class can inherit from only

inherit from only one class but it can implement

more than one interface
This means that if a variable is declared to be the type of an interface, its value can reference any object that is instantiated from any class that implements the interface

Infopulse Training Center

Слайд 14 Using an Interface as a Type
You can use

Using an Interface as a TypeYou can use interface names anywhere

interface names anywhere you can use any other data

type name
If you define a reference variable whose type is an interface, any object you assign to it must be an instance of a class that implements the interface

Infopulse Training Center

Слайд 15 Exercise: InterestInterface
Modify 442InterestSum project using interface

*
Infopulse Training Center

Слайд 16 Exercise: InterestInterface
See 452InterfaceDepo project for the full text

*
Infopulse

Training Center

Слайд 17 Cloning (1 of 2)
Use clone() method to get

Cloning (1 of 2)Use clone() method to get independent object instead

independent object instead of object’s assignment
clone() method can make

only a field-by-
field copy
Cloning is correct if a class contains only primitive fields or references to immutable objects
“Deep” cloning is necessary otherwise

Infopulse Training Center

Слайд 18 Cloning (2 of 2)
The clone method is a

Cloning (2 of 2)The clone method is a protected method of

protected method of Object, which means that your code

cannot simply call it
To make clone method accessible a class must:
Implement the Cloneable interface
Redefine the clone method with the public access modifier.

Слайд 19 Deep Cloning
To make a deep copy, you have

Deep CloningTo make a deep copy, you have clone the mutable

clone the mutable instance fields in the redefined clone

method

Слайд 20 Example: DepoBase Cloning
public abstract class DepoBase implements Cloneable{

. . . .

. .
public DepoBase clone() throws CloneNotSupportedException{
DepoBase cln = (DepoBase)super.clone();
cln.startDate = (Date)startDate.clone();
return cln;
}
. . . . . .
}

Слайд 21 Interfaces in Java SE 8
The interface body can

Interfaces in Java SE 8The interface body can contain:abstract methods (followed

contain:
abstract methods (followed by a semicolon, but no braces

– it does not contain an implementation
default methods (are defined with the default modifier)
static methods (with the static keyword)
constant declarations

Слайд 22 Interface Default Methods
You specify that a method definition

Interface Default MethodsYou specify that a method definition in an interface

in an interface is a default method with the default keyword

at the beginning of the method signature
Default method defines a default implementation
Default methods enable you to add new functionality to the interfaces of your libraries and ensure binary compatibility with code written for older versions of those interfaces
Any class that implements the interface with default method will have this method already defined

Слайд 23 Exercise: Default Method
Modify 452InterfaceDepo project:
Remove abstract DepoBase class
Add

Exercise: Default MethodModify 452InterfaceDepo project:Remove abstract DepoBase classAdd calculateInterest method as

calculateInterest method as default method of the InterestInterface

Слайд 24 Exercise: Default Method
See 453DefaultMethod project for the full

text

Слайд 25 Functional Interfaces
A functional interface is any interface that

Functional InterfacesA functional interface is any interface that contains only one abstract

contains only one abstract method
A functional interface may contain

one or more default methods or static methods
The abstract method of a functional interface can be implemented with help of lambda expression

Слайд 26 Lambda Expression
A lambda expression looks a lot like

Lambda ExpressionA lambda expression looks a lot like a method declarationYou

a method declaration
You can consider lambda expressions as anonymous

methods—methods without a name

Слайд 27 Example of Lambda Expression I
public class Calculator {

Example of Lambda Expression Ipublic class Calculator { interface IntegerMath {

interface IntegerMath {
int operation(int a, int b);
}

public int operateBinary(int a, int b, IntegerMath op) {
return op.operation(a, b);
}

Слайд 28 Example of Lambda Expression II
public static

void main(String... args) {
Calculator myApp

= new Calculator();
IntegerMath addition = (a, b) -> a + b;
IntegerMath subtraction = (a, b) -> a - b;
System.out.println("40 + 2 = " +
myApp.operateBinary(40, 2, addition));
System.out.println("20 - 10 = " +
myApp.operateBinary(20, 10, subtraction));
}
}

Слайд 29 Example of Lambda Expression
See 454LambdaCalulator for the full

text

Слайд 30 Lambda Expression Syntax I
A lambda expression consists of

Lambda Expression Syntax IA lambda expression consists of the following: a

the following:
a comma-separated list of formal parameters enclosed

in parentheses
the arrow token, ->
a body, which consists of a single expression or a statement block

Слайд 31 Lambda Expression Syntax II
You can omit the data

Lambda Expression Syntax IIYou can omit the data type of the

type of the parameters in a lambda expression
You

can omit the parentheses if there is only one parameter
If you specify a single expression, then the Java runtime evaluates the expression and then returns its value
Alternatively, you must enclose statements in braces {}