20070329 Object Oriented Programing Tips

public class Shape{
protected int h,w;
public void setWidth(int w){
this.w = w;
}
public void setHeight(int h){
this.h = h; →
}
}
public class Rectangele extends Shape{
}

public class Square extends Rectangle{
protected int h,w;
this.w = w; →
this.h = h;
}
this.w = w;
this.h = h;
}
}

LSP
public class Shape{
protected int h,w;
ArrayList<Rectangele> list
public void setWidth(int w){ = new ArrayList<Rectangele>();
this.w = w;
}
public void setHeight(int h){ for(Rectangler r : list){
}
this.h = h; r.setWidth(20);
} r.setHeight(10);
}
public class Rectangele extends Shape{
}

public class Square extends Rectangle{
protected int h,w;
this.w = w;
this.h = h;
} List Square
this.w = w;
this.h = h;
}
}

public class User{
public void dosth(Shape s){ public Interface Shape{
s.dosth(); public void dosth();
} }
}

public class Rectangle implements Shape{ public class Square implements Shape{
public void dosth(){ public void dosth(){
System.out.println(“do something”); System.out.println(“do something”);
} }
} }

Light Weight
POJP Plain Old Java Object



 Gof
 23 new

 →

 Temprate Method
 Strategy

 Factory Method

 Command
 State
 Null Object

Template Method
public abstract class DBInterface{ public class OracleInterface extends DBInterface{
public Date getData(){ protected void init(){
init(); //
Data data = getData();
exit();
return data; }
} protected Data getData(){
protected abstract void init(); //
protected abstract Data getData(); }
protected abstract void exit(); protected void exit(){
} //

}
extends }ublic class FireBirdInterface extends DBInterface{
p
////
}
 Data


 DBInterface
=
=public

Strategy
public Interface DBInterface{ public class OracleInterface implements DBInterface{
public void init(); public void init(){
public Data getData(); //
public void exit(); }
} public Data getData(){
//
}
implements public void exit(){
//
}
}

public class FireBirdInterface implements DBInterface{
////
}

 Template


 DBInterface

Template Method Strategy
public class TemlePrinter { Template Method
main(){
DBInterface di = new OracleInterface();
print(di.getData()); uses
} getData()
}

public class StratPrinter {
main(){ Strategy
DBInterface di = new OracleInterface();
di.init()
print(di.getData()); uses init() getData()
di.exit();
} exit()
}

 Template Method Strategy

 = Template Method
Strategy
Strategy init
DB Template Method

Factory Method
public Interface Bond{
public Interface BondFactory{ creates public int getMaturity();
public Bond getBondInstance();
public BigDecimal getFairValue();
}
}

implements implements

public class TreasuryFactory implements BondFactory{ public class Treasury implements Bond{
public Bond getBondInstance(){ ////
return new Treasury(); }
}
}

public class ConvertibleFactory implements BondFactory{ public class Convertible implements Bond{
public Bond getBondInstance(){ ////
return new Convertible();
}
}
}





 Bond Strategy Template
Factory Factory

Command

public class User{
public void dosth(Tranzaction t,String id){
t.do(id); public Interface Tranzaction{
} public void do(String id);
} }

public class addCommand implements Tranzaction{
public void do(String id){
//
}
}

public class removeCommand implements Tranzaction{
//
}
}

State

public class User{
State s = n;
public void dosth(){ public Interface State{
s.do(); public int do();
} }
}

public class GoodState implements State{
public void do(){
System.ouit.println(“Good State”);
}
}

public class BadState implements State{
public void do(){
System.ouit.println(“Good State”);
}
}

Null Object

Null

public class User{
public void dosth(Tranzaction t,String id){ public Interface Tranzaction{
t.do(id); public void do(String id);
} }
}

public class NullCommand implements Tranzaction{
//
}
}

DI Dipendency Injection

public class User{
public void dosth(Tranzaction t,String id){
t.do(id); public Interface Tranzaction{
} public void do(String id);
} }

DI

Tranzaction

public class removeCommand implements Tranzaction{
//
}
}

DI
 new

–

–

 DI
– Spring
– Seaser2
– EJB 3.0

Strategy/Temprate Method

DI

20070329 Object Oriented Programing Tips

20070329 Object Oriented Programing Tips

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