這是裝飾器模式的正確實現嗎？
[英]Is this a correct implementation of the Decorator pattern?
問題描述
主.java
package com.example.decorator;
public class Main {
public static void main(String[] args) {
Response response = new Response();
View head = new View("<title>Hello, world!</title>");
View body = new View("<h1>Hello, world!</h1>");
response.setContent(new HtmlLayout(head, body));
response.render();
}
}
響應.java
package com.example.decorator;
public class Response {
private Response content;
public Response () {}
public <T extends Response> void setContent(T content) {
this.content = content;
}
public void render() {
this.content.render();
};
}
查看.java
package com.example.decorator;
public class View extends Response {
private String content;
public View(String content) {
this.content = content;
}
public void setContent(String content) {
this.content = content;
}
public String getContent() {
return this.content;
}
public void render() {
System.out.println(this.content);
}
}
布局.java
package com.example.decorator;
public class Layout extends Response {
private Response view;
public <T extends Response> Layout(T view) {
this.view = view;
}
public void render() {
this.view.render();
}
}
HtmlLayout.java
package com.example.decorator;
public class HtmlLayout extends Response {
private Response head;
private Response body;
public <T extends Response> HtmlLayout(T head, T body) {
this.head = head;
this.body = body;
}
public void render() {
System.out.println("<!doctype html>");
System.out.println("<html>");
System.out.println("<head>");
this.head.render();
System.out.println("</head>");
System.out.println("<body>");
this.body.render();
System.out.println("</body>");
System.out.println("</html>");
}
}
2 個解決方案
解決方案1
2 2011-06-04 01:21:42
當您希望（接口）A 類型的 object 比當前執行更多操作時，使用裝飾器模式。 一個例子是：Web 適合您的物理屏幕的頁面（邏輯屏幕）不需要滾動條。 但是，如果頁面（邏輯屏幕）不適合物理屏幕，則必須用滾動條裝飾它。 用 GOF 的話來說：Decorator 的目的是動態地將額外的職責附加到 object 上。
在看起來像這樣的代碼中：
interface LogicalScreen {
void render(String physical );
}
一個實現：
class SimpleScreen implements LogicalScreen {
public void render(String physical) {
// render itself
}
}
裝飾器的實現：
class ScreenWithScrollbar implements LogicalScreen {
private final LogicalScreen decoratd;
public ScreenWithScrollbar(LogicalScreen decorated) {
this.decoratd = decorated;
}
public void render(String physical) {
// render scroll bar
// ...
// render the decorated
decoratd.render(physical);
// eventually do some more stuff
}
public doScroll() {}
}
接線方式：
public class WhatIsDecorator {
public static void main(String[] args) {
LogicalScreen l1 = new SimpleScreen();
LogicalScreen ds = new ScreenWithScrollbar(l1);
ds.render("MyMonitor");
}
}
您可以根據需要鏈接盡可能多的鏈接。 裝飾器2（裝飾器1（簡單））...
解決方案2
-1 2011-06-03 21:29:22
據我簡短地查看：
- 將您的響應更改為界面
- 您的 View.java 確實與裝飾器模式不匹配，因此請刪除 Response 的擴展，例如
此致
這是策略模式（JAVA，鴨子的飛行方法）的正確實現嗎？
[英]Is this a correct implementation of the strategy pattern (JAVA, Fly method of ducks)?
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