Java学习源代码检索系统免费版

				//==============================================================
				// Dictionary.java - Create dictionary using TreeMap and LinkedList
				//
				// Java学习源代码检索系统 Ver 1.0 20031015 免费正式版
				// 版权所有: 中国IT认证实验室(www.ChinaITLab.com)
				// 程序制作: ChinaITLab网校教研中心
				// 主页地址: www.ChinaITLab.com    中国IT认证实验室
				// 论坛地址: bbs.chinaitlab.com  
				// 电子邮件: Java@ChinaITLab.com
				//==============================================================
				
				import java.util.*;
				import java.io.*;
				
				class Dictionary {
				
				// Construct TreeMap dictionary container
				  static TreeMap dict = new TreeMap();
				
				// Lookup and show definition for the specified word (key)
				 static void showDefinition(String word) {
				  LinkedList defs = (LinkedList)dict.get(word);
				  if (defs == null) return;  // Ignore if not there
				  ListIterator L = defs.listIterator();
				  int count = 1;  // Definition counter
				  System.out.println("\n" + word);
				  while (L.hasNext()) {
				    String definition = (String)L.next();
				    System.out.println(count++ + ". " + definition);
				  }   
				 }
				
				// Display entire dictionary
				 static void showDictionary() {
				  Iterator I = dict.keySet().iterator();
				  while (I.hasNext())
				   showDefinition((String)I.next());
				 }
				
				// Add a new word and/or definition
				 static void addWord(String word, String definition) {
				  if (dict.containsKey(word)) {
				   LinkedList defs = (LinkedList)dict.get(word);
				   defs.add(definition);  // Add new definition only
				  } else {
				   LinkedList defs = new LinkedList();  // New list
				   defs.add(definition);  // Add definition to new list
				   dict.put(word, defs);  // Add word and defs association
				  }
				 }
				
				 public static void main(String args[]) {
				
				// Read words and definitions into the container
				  try {
				   FileReader fr = new FileReader("Dictionary.txt");
				   BufferedReader br = new BufferedReader(fr);
				   String word = br.readLine();
				   while (word != null) {
				    addWord(word, br.readLine());  // Add word and definition
				    br.readLine();         // Skip blank line
				    word = br.readLine();  // Read next word
				   }
				  } catch (FileNotFoundException e) {
				   System.out.println("File not found: " + e.getMessage());
				  } catch (IOException e) {
				   System.out.println("I/O error: " + e.getMessage());
				  }
				
				// Look up one word or show entire dictionary
				 if (args.length == 0)
				  showDictionary();         // Show all
				 else
				  showDefinition(args[0]);  // Show selection
				
				 }  // main
				} // class