Builder Pattern

来源：互联网发布：养老保险的算法编辑：程序博客网时间：2024/05/21 22:29

import java.io.*;abstract class Builder{public abstract void makeTitle(String title);public abstract void makeString(String str);public abstract void makeItems(String[] items);public abstract Object getResult();}; class Director{private Builder builder;public Director(Builder builder){this.builder = builder;}public Object construct(){builder.makeTitle("Greeting");builder.makeString("´ÓÔçÉÏµ½°×Ìì½áÊø");builder.makeItems(new String[]{"Ôç°²","Îç°²",});builder.makeString("µ½ÁËÍíÉÏ");builder.makeItems(new String[]{"Íí°²","×£ÄãÓÐ¸öºÃÃÎ","ÔÙ¼û",});return builder.getResult();}}; class TextBuilder extends Builder{private StringBuffer buffer = new StringBuffer();public void makeTitle(String title){buffer.append("======================/n");buffer.append("¡¶"+title+"¡·");buffer.append("/n");}public void makeString(String str){buffer.append("ss"+str+"/n");buffer.append("/n");}public void makeItems(String[] items){for(int i=0;i<items.length;i++){buffer.append("."+items[i] +"/n");}buffer.append("/n");}public Object getResult(){buffer.append("======================/n");return buffer.toString();}}; class HTMLBuilder extends Builder{private String filename;private PrintWriter writer;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>");writer.println("<h1>"+title+"</h1>");}public void makeString(String str){writer.println("<p>"+str+"</p>");}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>");}public Object getResult(){writer.println("</body></html>");writer.close();return filename;}}; class Main{public static void main(String[] args){if(args.length != 1){usage();System.exit(0);}if(args[0].equals("plain")){Director director = new Director(new TextBuilder());String result = (String)director.construct();System.out.println(result);}else if(args[0].equals("html")){Director director = new Director(new HTMLBuilder());String filename = (String)director.construct();System.out.println("ÒÑ²úÉú"+filename+".");}else{usage();System.exit(0);}}public static void usage(){System.out.println("Usage:java Main plain ²úÉúÒ»°ã¸ñÊ½µÄÎÄ¼þ");System.out.println("Usage:java Main Html ²úÉúHTML¸ñÊ½µÄÎÄ¼þ");}};