代码文件结构：
星巴兹案例：
CondimentDecorator
package Chapter3_DecorativeObjects.Decorators;
import Chapter3_DecorativeObjects.Beverage;
/**
* @Author 竹心
* @Date 2023/8/3
**/
public abstract class CondimentDecorator extends Beverage {
Beverage beverage;
public abstract String getDescription();
public Size getSize(){
return this.beverage.getSize();
}
}
Mocha
package Chapter3_DecorativeObjects.Decorators;
import Chapter3_DecorativeObjects.Beverage;
/**
* @Author 竹心
* @Date 2023/8/3
**/
public class Mocha extends CondimentDecorator{
public Mocha(Beverage beverage){
//在前一种饮料的基础上加上装饰
//然后就可以通过 this.beverage.cost()来获取前者的花费，递归获取最终花费
this.beverage = beverage;
}
@Override
public String getDescription() {
return this.beverage.getDescription()+", Mocha";//摩卡
}
@Override
public double cost() {
//递归获取最终花费
double cost = this.beverage.cost();
if(this.beverage.getSize() == Size.TALL){
cost+=0.15;
}else if(this.beverage.getSize() == Size.GRANDE){
cost+=0.20;
}else if(this.beverage.getSize() == Size.VENTI){
cost+=0.25;
}
return cost;
}
}
Soy
package Chapter3_DecorativeObjects.Decorators;
import Chapter3_DecorativeObjects.Beverage;
/**
* @Author 竹心
* @Date 2023/8/3
**/
public class Soy extends CondimentDecorator{
public Soy(Beverage beverage){
this.beverage = beverage;
}
@Override
public String getDescription() {
return this.beverage.getDescription()+", Soy";//豆奶
}
@Override
public double cost() {
//递归获取最终花费
double cost = this.beverage.cost();
if(this.beverage.getSize() == Size.TALL){
cost+=0.10;
}else if(this.beverage.getSize() == Size.GRANDE){
cost+=0.15;
}else if(this.beverage.getSize() == Size.VENTI){
cost+=0.20;
}
return cost;
}
}
Whip
package Chapter3_DecorativeObjects.Decorators;
import Chapter3_DecorativeObjects.Beverage;
/**
* @Author 竹心
* @Date 2023/8/3
**/
public class Whip extends CondimentDecorator{
public Whip(Beverage beverage){
this.beverage = beverage;
}
@Override
public String getDescription() {
return this.beverage.getDescription()+", Whip";//奶泡
}
@Override
public double cost() {
//递归获取最终花费
double cost = this.beverage.cost();
if(this.beverage.getSize() == Size.TALL){
cost+=0.08;
}else if(this.beverage.getSize() == Size.GRANDE){
cost+=0.10;
}else if(this.beverage.getSize() == Size.VENTI){
cost+=0.12;
}
return cost;
}
}
Beverage
package Chapter3_DecorativeObjects;
/**
* @Author 竹心
* @Date 2023/8/3
**/
public abstract class Beverage {
String description = "Unknown Beverage";
//加入小杯、中杯和大杯（tall, grande, venti）
public enum Size{TALL, GRANDE, VENTI};
Size size = Size.TALL;
public Size getSize() {
return size;
}
public void setSize(Size size) {
this.size = size;
}
public String getDescription(){
return this.description;
}
public abstract double cost();
}
Espresso
package Chapter3_DecorativeObjects;
/**
* @Author 竹心
* @Date 2023/8/3
**/
public class Espresso extends Beverage{
public Espresso(){
this.description = "Espresso";//浓缩咖啡
}
@Override
public double cost() {
return 1.99;
}
}
HouseBlends
package Chapter3_DecorativeObjects;
/**
* @Author 竹心
* @Date 2023/8/3
**/
public class HouseBlends extends Beverage{
public HouseBlends(){
this.description = "House Blend Coffee";//家常综合咖啡
}
@Override
public double cost() {
return 0.89;
}
}
StarbuzzCoffee
package Chapter3_DecorativeObjects;
import Chapter3_DecorativeObjects.Decorators.Mocha;
import Chapter3_DecorativeObjects.Decorators.Soy;
import Chapter3_DecorativeObjects.Decorators.Whip;
/**
* @Author 竹心
* @Date 2023/8/3
**/
public class StarbuzzCoffee {
public static void main(String[] args) {
Beverage beverage = new Espresso();//浓缩咖啡
System.out.println(beverage.getDescription()+" $"+beverage.cost());
Beverage beverage1 = new HouseBlends();
beverage1 = new Mocha(beverage1);//在家常综合咖啡里面加入摩卡
beverage1 = new Whip(beverage1);//再加入奶泡
beverage1 = new Soy(beverage1);//再加入豆奶
beverage1 = new Mocha(beverage1);//双倍摩卡
System.out.println(beverage1.getDescription()+" $"+beverage1.cost());
Beverage beverage2 = new HouseBlends();
beverage2.setSize(Beverage.Size.VENTI);//选择大杯
beverage2 = new Mocha(beverage2);//在家常综合咖啡里面加入摩卡
beverage2 = new Whip(beverage2);//再加入奶泡
beverage2 = new Soy(beverage2);//再加入豆奶
beverage2 = new Mocha(beverage2);//双倍摩卡
System.out.println(beverage2.getDescription()+" $"+beverage2.cost());
}
}
运行结果：
myJavaIO案例
LowerCaseInputStream
package Chapter3_DecorativeObjects.MyJavaIO;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* @Author 竹心
* @Date 2023/8/3
**/
public class LowerCaseInputStream extends FilterInputStream {
public LowerCaseInputStream(InputStream in){
super(in);//在任意一种输入组件的基础上加入我们自己的装饰
}
@Override
public int read() throws IOException {
//按字节为输入
int c = in.read();
//将每个字符转成小写
//这里可以根据自己的需求更改
return (c == -1 ? c : Character.toLowerCase((char)c));
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
//按字节数组为输入
int result = read(b, off, len);
for(int i = off; i< off+result;i++){
b[i] = (byte) Character.toLowerCase((char)b[i]);
}
return result;
}
}
InputTest
package Chapter3_DecorativeObjects.MyJavaIO;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* @Author 竹心
* @Date 2023/8/3
**/
public class InputTest {
public static void main(String[] args) {
int c;
try{
InputStream in = new LowerCaseInputStream(
new BufferedInputStream(
new FileInputStream("D:\\JAVA\\Code\\DesignPatterns\\src\\Chapter3_DecorativeObjects\\MyJavaIO\\test.txt")));
while((c = in.read()) >= 0){
System.out.print((char)c);
}
in.close();
}catch (IOException e){
e.printStackTrace();
}
}
}
test.txt
Try My Best To Beat You!运行结果：
