适配器模式（Adapter）

将某类的接口转换为客户所需的接口。Adapter能协调不兼容的接口，使它们共同工作。封装现有组件接口，使其适应客户端。

Target（ChemicalCompound）

定义Client要使用的特定接口

Adapter（Compound）

转换Adaptee接口为用户所要的Target接口。

Adaptee（ChemicalDatabank）

定义需要转换的现有接口。

Client(AdapterApp)

调用Target接口

代码：

//Target

public class ChemicalCompound{

protected String name;

protected float boilingPoint; //沸点

protected float meltingPoint; //溶点

protected double molecularWeight; //分子量

protected String molecularFormula; //分子式

public ChemicalCompound(String name){

this.name=name;

}

public float get BoilingPoint{

return this.boilingPoint;

}

public float getMeltingPoint {

return this.meltingPoint;

}

public float getMolecularWeight {

return this.molecularWeight;

}

public float getMolecularFormula {

return this.molecularFormula;

}

}

//Adapter

public class Compound extends ChemicalCompound{

private ChemicalDatabank bank;

public Compound(String name){

supter(name);

bank=new ChemicalDatabank();

boilingPoint=bank.GetCriticalPoint(name,”B”);

meltingPoint=bank.getCriticalPoint(name,”M”);

molecularWeight=bank.GetMolecularWeight(name);

molecularFormula=bank.getMolecularStructure(name);

}

public void Display(){

System.out.println(“Compound:”+name);

System.out.println(“ Formula:”+ molecularFormula);

System.out.println(“ Weight:”+ molecularWeight);

System.out.println(“ Melting Pt:”+ meltingPoint);

System.out.println(“ Boiling Pt:”+ boilingPoint);

}

}

//Adaptee

class ChemicalDatabank{

public float GetCriticalPoint(String compound, String point){

float temperature=0.0F;

//melting point

if(point==”M”){

if (compound.equal(”water”))

temperature=0.0F;

if(compound.equal(”benzene”))

temperature=5.5F;

if(compound.equal(”alcohol”))

temperature=-114.1F;

}else{

//Boiling Point

if (compound.equal(”water”))

temperature=100.0F;

if(compound.equal(”benzene”))

temperature=80.1F;

if(compound.equal(”alcohol”))

temperature=-78.3F;

}

return temperature;

}

public String GetMolecularStructure(String compound){

String structure=””;

if (compound.equal(”water”))

structure =”H20”;

if(compound.equal(”benzene”))

structure =”C6H6”;

if(compound.equal(”alcohol”))

structure =”C2H602”;

return structure;

}

public double GetMolecularWeight(String compound){

double weight=0.0;

if (compound.equal(”water”))

weight =18.015;

if(compound.equal(”benzene”))

weight =78.1134;

if(compound.equal(”alcohol”))

weight =46.0688;

return weight;

}

}

//adapterapp test

public class AdapterApp{

public static void main(String[] args){

Compound water=new Compound(“water”);

water.Display();

Compound benzene=new Compound(“benzene”);

benzene.Display();

Compound alcohol=new Compound(“alcohol”);

alcohol.Display();

}

}

Output

Compound: Water ------
Formula: H20
Weight : 18.015
Melting Pt: 0
Boiling Pt: 100

Compound: Benzene ------
Formula: C6H6
Weight : 78.1134
Melting Pt: 5.5
Boiling Pt: 80.1

Compound: Alcohol ------
Formula: C2H6O2
Weight : 46.0688
Melting Pt: -114.1
Boiling Pt: 78.3