Adapter 模式的小例子以及分析

Adapter 模式的小例子以及分析

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package com.eric.interfaceAndInnerClass;

/**

* Apply 类主要处理Process类型的方法，在下面的UperStringProcess，LowerStringProcess

* 由于实现了Process的借口所以理所当然的会被Apply的处理

* NumberOperator借口的子类由于并没有显示process借口,所以其子类是不能被Apply方法所调用，而通常情况下类似于NumberOperator这样的类往往是库函数定义好的，我们也不能去更改，

* 这个时候如果想让其被Apply类处理的话，Adapter模式就发挥其作用了，具体请康NumberAdapter类

*

* */

public class AdapterPartner {

public static void main(String[] args) {

String str = "I Come From Chinses";

Process uperStr = new UperStringProcess();

Process lowStr = new LowerStringProcess();

Apply.Process(uperStr, str);

Apply.Process(lowStr, str);

NumberOperator noAdd = new AddNumber();

NumberOperator noSub = new SubNumber();

NumberAdapter naAdd = new NumberAdapter(noAdd);

NumberAdapter naSub = new NumberAdapter(noSub);

Apply.Process(naAdd, "numer add:");

Apply.Process(naSub, "numer sub:");

}

}

interface Process {

String name();

void process(Object obj);

}

class Apply {

static void Process(Process process, Object obj) {

System.out.println("Class name is:" + process.name());

process.process(obj);

}

}

abstract class StringProcess implements Process {

public String name() {

return this.getClass().getName();

}

public abstract void process(Object obj);

}

class UperStringProcess extends StringProcess {

@Override

public void process(Object obj) {

System.out.println("to uper case:" + ((String) obj).toUpperCase());

}

}

class LowerStringProcess extends StringProcess {

@Override

public void process(Object obj) {

System.out.println("to lower case:" + ((String) obj).toLowerCase());

}

}

class NumberAdapter implements Process{

private NumberOperator no;

public NumberAdapter(NumberOperator no){

this.no=no;

}

public String name() {

return no.name();

}

public void process(Object obj) {

no.process(obj);

}

}

interface NumberOperator {

int numbe1 = 10;

int number2 = 5;

String name();

void process(Object obj);

}

class AddNumber implements NumberOperator {

public String name() {

return "two number added!";

}

public void process(Object obj) {

System.out.println(obj);

System.out.println(numbe1 + number2);

}

}

class SubNumber implements NumberOperator {

public String name() {

return "two number sub!";

}

public void process(Object obj) {

System.out.println(obj);

System.out.println(numbe1 - number2);

}

}