1
2
3
4
5 import java.io.*;
6
7 abstract class Builder {
8 public abstract void makeTitle(String title);
9 public abstract void makeString(String str);
10 public abstract void makeItems(String[] items);
11 public abstract Object getResult();
12 }
13
14 class Director {
15 private Builder builder;
16 public Director(Builder builder) {
17 this.builder = builder;
18 }
19 public Object construct() {
20 builder.makeTitle("Greeting");
21 builder.makeString("In the morning and afternoon...");
22 builder.makeItems(new String[] {
23 "Good morning",
24 "Good afternoon",
25 });
26 builder.makeString("In the evening...");
27 builder.makeItems(new String[] {
28 "Hello",
29 "Good evening",
30 "Good nignt",
31 });
32 return builder.getResult();
33 }
34 }
35
36 class TextBuilder extends Builder {
37 private StringBuffer buffer = new StringBuffer();
38 public void makeTitle(String title) {
39 buffer.append("=====================\n");
40 buffer.append("["+title+"]");
41 buffer.append("\n");
42 }
43 public void makeString(String str) {
44 buffer.append(" * "+str+"\n");
45 buffer.append("\n");
46 }
47 public void makeItems(String[] items) {
48 for(int i=0; i < items.length; i++) {
49 buffer.append(" . "+items[i]+"\n");
50 }
51 buffer.append("\n");
52 }
53 public Object getResult() {
54 buffer.append("=======================\n");
55 return buffer.toString();
56 }
57 }
58
59 class HTMLBuilder extends Builder {
60 private String filename;
61 private PrintWriter writer;
62 public void makeTitle(String title) {
63 filename = title+".html";
64 try {
65 writer = new PrintWriter(new FileWriter(filename));
66 } catch(IOException e) {
67 e.printStackTrace();
68 }
69 writer.println("<html><head><title>"+title+"</title></head><body>");
70 writer.println("<h1>"+title+"</h1>");
71 }
72 public void makeString(String str) {
73 writer.println("<p>"+str+"</p>");
74 }
75 public void makeItems(String[] items) {
76 writer.println("<ul>");
77 for(int i=0; i < items.length; i++) {
78 writer.println("<li>"+items[i]+"</li>");
79 }
80 writer.println("</ul>");
81 }
82 public Object getResult() {
83 writer.println("</body></html>");
84 writer.close();
85 return filename;
86 }
87 }
88
89 public class BuilderDoc {
90 public static void main(String[] args) {
91 Director d1 = new Director(new TextBuilder());
92 String result = (String)d1.construct();
93 System.out.println(result);
94
95 Director d2 = new Director(new HTMLBuilder());
96 String filename = (String)d2.construct();
97 System.out.println(filename);
98 }
99 }
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