java設計模式--裝飾者模式
照例搬一篇文章連線，我一般會選擇帶有uml圖的 方便理解，我只貼程式碼，因為我覺得別人理解的比我透徹，寫的比我好 http://www.cnblogs.com/stonefeng/p/5679638.html
裝飾者模式可以給物件新增一些額外的東西，設計模式那種書中舉例是星巴克的例子，如果每一種做法都寫一個類的話大概會爆炸，所以選擇靈活的方式
1.建立抽象類，定義基本的行為，裝飾者和被裝飾著都去繼承他
public abstract class Component {
public String desc = "我是抽象元件，他們的共同父類";
public String getDesc() {
return desc;
}
public abstract int price();
}
2.被裝飾者
public class ACupCoffe extends Component{
public ACupCoffe() {
desc = "一杯咖啡";
}
@Override
public int price() {
// TODO Auto-generated method stub
return 10;
}
}
3.裝飾者
public abstract class Decorator extends Component{
public abstract String getDesc();
}
4.具體裝飾者1
public class Coffee extends Decorator{
private Component acupcoffe;
public Coffee(Component acupcoffe) {
this.acupcoffe = acupcoffe;
}
@Override
public String getDesc() {
// TODO Auto-generated method stub
return acupcoffe.getDesc() + "咖啡";
}
@Override
public int price() {
// TODO Auto-generated method stub
return acupcoffe.price() + 10;
}
}
5.具體裝飾者2
public class Sugar extends Decorator{
private Component acupcoffe;
public Sugar(Component aCupCoffe) {
this.acupcoffe = aCupCoffe;
}
@Override
public String getDesc() {
return acupcoffe.getDesc() + "糖";
}
@Override
public int price() {
// TODO Auto-generated method stub
return acupcoffe.price() + 10;
}
}
6.客戶端
public class Client {
public static void main(String[] args) {
Component aCupCoffe = new ACupCoffe();
aCupCoffe = new Sugar(aCupCoffe);
System.out.println(aCupCoffe.getDesc());
System.out.println(aCupCoffe.price());
aCupCoffe = new Coffee(aCupCoffe);
System.out.println(aCupCoffe.getDesc());
System.out.println(aCupCoffe.price());
}
}