java 设计模式之生成器模式

生成器模式：将一个复杂对象的构建与它的表示分离，使同样的构建过程可以创建不同的表示（Separate the construction of a complex object from its representation so that the same construction process can create different representations）。

生成器模式结构中的四种角色。

产品(Product）： 所要构建的复杂对象。

抽象生成器(Builder): 抽象生成器是一个接口，该接口除了为创建一个Product对象的各个组件定义若干个方法外，还要定义返回Product对象的方法。

具体生成器(ConcreteBuilder): 实现Buidler接口的类。

指挥者(Director): 指挥者是一个类，该类需含有Builder接口申明的变量，指挥者的职责是负责向用户提供具体的生成器，利用具体生成器构造复杂的Product对象。

 

代码如下：

Product类：

 1 package cn.zj.qiao.designPattern.builder;
 2 
 3 import javax.swing.JButton;
 4 import javax.swing.JLabel;
 5 import javax.swing.JPanel;
 6 import javax.swing.JTextField;
 7 
 8 public class PanelProduct extends JPanel {
 9     /**
10      * 
11      */
12     private static final long serialVersionUID = 1L;
13     JButton button;
14     JLabel label;
15     JTextField textField;
16 }

Builder 接口：

 1 package cn.zj.qiao.designPattern.builder;
 2 
 3 import javax.swing.JButton;
 4 import javax.swing.JLabel;
 5 import javax.swing.JPanel;
 6 import javax.swing.JTextField;
 7 
 8 public class PanelProduct extends JPanel {
 9     /**
10      * 
11      */
12     private static final long serialVersionUID = 1L;
13     JButton button;
14     JLabel label;
15     JTextField textField;
16 }

ConcreteBuilder 如下两个类（ConcreteBuilderOne和ConcreteBuilderTwo)：

 1 package cn.zj.qiao.designPattern.builder;
 2 
 3 
 4 import javax.swing.JButton;
 5 import javax.swing.JLabel;
 6 import javax.swing.JPanel;
 7 import javax.swing.JTextField;
 8 
 9 public class ConcreteBuilderOne implements Builder {
10     private PanelProduct panel;    //创建需要的容器
11     
12     ConcreteBuilderOne(){
13         panel = new PanelProduct();
14     }
15     @Override
16     public void buildButton() {
17         panel.button = new JButton("btn");
18 
19     }
20 
21     @Override
22     public void buildLabel() {
23         panel.label = new JLabel("lable");
24 
25     }
26 
27     @Override
28     public void buildTextField() {
29         panel.textField = new JTextField("hello");
30 
31     }
32 
33     @Override
34     public JPanel getPanel() {
35         panel.add(panel.button);
36         panel.add(panel.label);
37         panel.add(panel.textField);
38         return panel;
39     }
40 
41 }
42 
43 
44 package cn.zj.qiao.designPattern.builder;
45 
46 import javax.swing.JButton;
47 import javax.swing.JLabel;
48 import javax.swing.JPanel;
49 import javax.swing.JTextField;
50 
51 public class ConcreteBuilderTwo implements Builder {
52     private PanelProduct panel;
53     
54     ConcreteBuilderTwo(){
55         panel = new PanelProduct();
56     }
57     @Override
58     public void buildButton() {
59         panel.button = new JButton("btn");
60 
61     }
62 
63     @Override
64     public void buildLabel() {
65         panel.label = new JLabel("label");
66 
67     }
68 
69     @Override
70     public void buildTextField() {
71         panel.textField = new JTextField("helo");
72 
73     }
74 
75     @Override
76     public JPanel getPanel() {
77         panel.add(panel.textField);
78         panel.add(panel.label);
79         panel.add(panel.button);
80         return panel;
81     }
82 
83 }

Director类：

 1 package cn.zj.qiao.designPattern.builder;
 2 
 3 import javax.swing.JPanel;
 4 
 5 public class Director {
 6     private Builder builder;
 7     
 8     Director(Builder builder){
 9         this.builder = builder;
10     }
11     
12     public JPanel constructProduct(){
13         builder.buildButton();
14         builder.buildLabel();
15         builder.buildTextField();
16         return     builder.getPanel();
17     }
18 }

下面是测试代码：

 1 package cn.zj.qiao.designPattern.builder;
 2 
 3 import java.awt.Container;
 4 
 5 import javax.swing.JFrame;
 6 import javax.swing.JPanel;
 7 
 8 public class Application {
 9     public static void main(String[] args){
10             Builder builder = new ConcreteBuilderOne();
11             Director dir = new Director(builder);
12             JPanel panel = dir.constructProduct();
13             JFrame frameOne = new JFrame("hello");
14             Container con = frameOne.getContentPane();
15             con.add(panel);
16             frameOne.setBounds(12, 12, 200, 120);
17             frameOne.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
18             frameOne.setVisible(true);
19             
20             builder = new ConcreteBuilderTwo();
21             dir = new Director(builder);
22             panel = dir.constructProduct();
23             JFrame frameTwo = new JFrame("hello");
24             con = frameTwo.getContentPane();
25             con.add(panel);
26             frameTwo.setBounds(222, 12, 200, 120);
27             frameTwo.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
28             frameTwo.setVisible(true);
29             
30         }
31 }