package builder;
public abstract class Builder {
public abstract void makeTitle(String title);
public abstract void makeString(String str);
public abstract void makeItems(String[] items);
public abstract void close();
}
package builder;
public class Director {
private Builder builder;
public Director(Builder builder) {
this.builder = builder;
}
public void construct() {
builder.makeTitle("Greeting");
builder.makeString("아침과 낮에");
builder.makeItems(new String[] {
"좋은 아침입니다.",
"안녕하세요."
});
builder.makeString("밤에");
builder.makeItems(new String[] {
"안녕하세요",
"안녕히 주무세요",
"안녕히 계세요."
});
builder.close();
}
}
package builder;
public class TextBuilder extends Builder {
private StringBuffer buffer = new StringBuffer();
@Override
public void makeTitle(String title) {
buffer.append("===============================\n");
buffer.append("『" + title + "』\n");
buffer.append("\n");
}
@Override
public void makeString(String str) {
buffer.append("■" + str + "\n");
buffer.append("\n");
}
@Override
public void makeItems(String[] items) {
for (int i = 0; i < items.length; i++) {
buffer.append("●" + items[i] + "\n");
}
buffer.append("\n");
}
@Override
public void close() {
buffer.append("===============================\n");
}
public String getResult() {
return buffer.toString();
}
}
package builder;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
public class HTMLBuilder extends Builder {
private String fileName;
private PrintWriter writer;
@Override
public void makeTitle(String title) {
fileName = title + ".html";
try {
writer = new PrintWriter(new FileWriter(fileName));
} catch (IOException e) {
e.printStackTrace();
}
writer.println("<html><head><title>" + title + "</title></head><body>");
writer.println("<h1>" + title + "</h1>");
}
@Override
public void makeString(String str) {
writer.println("<p>" + str + "</p>");
}
@Override
public void makeItems(String[] items) {
writer.println("<ul>");
for (int i = 0; i < items.length; i++) {
writer.println("<li>" + items[i] + "</li>");
}
writer.println("</ul>");
}
@Override
public void close() {
writer.println("</body></html>");
writer.close();
}
public String getResult() {
return fileName;
}
}
package builder;
public class Main {
public static void main(String[] args) {
if(args.length != 1) {
usage();
System.exit(0);
}
if(args[0].equals("plain")) {
TextBuilder textBuilder = new TextBuilder();
Director director = new Director(textBuilder);
director.construct();
String result = textBuilder.getResult();
System.out.println(result);
}else if(args[0].equals("html")) {
HTMLBuilder htmlBuilder = new HTMLBuilder();
Director director = new Director(htmlBuilder);
director.construct();
String fileName = htmlBuilder.getResult();
System.out.println(fileName + "가 작성되었습니다.");
}else {
usage();
System.exit(0);
}
}
public static void usage() {
System.out.println("NO parameter");
}
}
결과:
빌더패턴 정리
Builder(건축자)의 역할
'자바' 카테고리의 다른 글
| [자바] Observer 패턴 (0) | 2021.06.03 |
|---|---|
| [자바] 싱글톤이 보장받지 않는 상황 (0) | 2021.06.03 |
| [자바] 장식자 패턴 (0) | 2021.06.03 |
| List의 중복제거, HashSet (1) | 2021.05.24 |
| [자바] 재귀함수와 증감연산자 (0) | 2021.05.15 |
