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 }