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| 34. 10. 1. 装饰模式 |
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interface Countable {
String getName();
float getCount();
}
class Book implements Countable {
public String getName() {
return "Book";
}
public float getCount() {
return 0;
}
}
abstract class Number implements Countable {
protected Countable component;
Number(Countable component) {
this.component = component;
}
public float getCount() {
return component.getCount();
}
public abstract String getName();
}
class Integer extends Number {
private float value = 0.75f;
private String description = " integer";
public Integer(Countable component) {
super(component);
}
public float getCount() {
return component.getCount() + value;
}
public String getName() {
return component.getName() + description;
}
}
class Float extends Number {
private String description = " float";
public Float(Countable component) {
super(component);
}
public String getName() {
return component.getName() + description;
}
}
class Double extends Number {
private float value = 0.25f;
private String description = " double";
public Double(Countable component) {
super(component);
}
public float getCount() {
return component.getCount() + value;
}
public String getName() {
return component.getName() + description;
}
}
class Decimal extends Number {
private float value = 0.25f;
private String description = " decimal";
public Decimal(Countable component) {
super(component);
}
public float getCount() {
return component.getCount() + value;
}
public String getName() {
return component.getName() + description;
}
}
class Positive extends Number {
private float cost = 0.25f;
private String description = " positive";
public Positive(Countable component) {
super(component);
}
public float getCount() {
return component.getCount() + cost;
}
public String getName() {
return component.getName() + description;
}
}
class Negative extends Number {
private float value = -0.25f;
private String description = " negative";
public Negative(Countable component) {
super(component);
}
public float getCount() {
return component.getCount() + value;
}
public String getName() {
return component.getName() + description;
}
}
public class NumberCountableDemo {
public static void main(String[] args) {
Countable cappuccino = new Integer(new Double(new Book()));
System.out.println(cappuccino.getName().trim() + ": $" + cappuccino.getCount());
Countable cafeMocha = new Integer(new Decimal(new Negative(new Positive(new Float(
new Book())))));
System.out.println(cafeMocha.getName().trim() + ": $" + cafeMocha.getCount());
}
}
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