案例：通過不同的紙張和不同類型墨盒的組合，來裝配出一臺打印機。
架構目錄：
步驟一：在ink包下創建Ink接口和其實現類
Ink接口
public interface Ink {
public String getColor();
}
實現類ColorInk
public class ColorInk implements Ink {
public String getColor() {
return "彩色墨盒";
}
}
實現類GrayInk
public class GrayInk implements Ink{
// 打印採用灰色
public String getColor() {
return "灰色墨盒";
}
}
步驟二：在paper包下創建Paper接口及其實現類
Paper接口
public interface Paper {
public String getContent();
}
Paper實現類
public class A4Paper implements Paper {
public String getContent() {
return "一張淡定的A4紙";
}
}
步驟三：在printer包下創建Print類
public class Print {
private Ink ink;
private Paper paper;
public void print(){
System.out.println("用X顏色的墨盒在紙上打印內容");
}
public Ink getInk() {
return ink;
}
public void setInk(Ink ink) {
this.ink = ink;
}
public Paper getPaper() {
return paper;
}
public void setPaper(Paper paper) {
this.paper = paper;
}
}
步驟四：在applicationContext.xml中配置
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="colorInk" class="cn.happy.ink.ColorInk"/>
<bean id="grayInk" class="cn.happy.ink.GrayInk"/>
<!--對Paper的初始化 -->
<bean id="paper" class="cn.happy.paper.A4Paper"/>
<!-- 對打印機進行配置-->
<bean id="printer"class="cn.happy.printer.Print">
<property name="ink" ref="colorInk"></property>
<property name="paper" ref="paper"></property>
</bean>
</beans>
步驟五：通過Test類測試
public static void main(String[] args) {
ApplicationContextcontext = new ClassPathXmlApplicationContext("applicationContext.xml");
Printprinter = (Print)context.getBean("printer");
Stringcolor=printer.getInk().getColor();
Stringcontent=printer.getPaper().getContent();
System.out.println(color);
System.out.println("===========");
System.out.println(content);
}
