Add basic javadoc to demo classes.

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@381422 13f79535-47bb-0310-9956-ffa450edef68

src/demo/org/apache/lucene/demo/DeleteFiles.java

@@ -22,8 +22,13 @@ import org.apache.lucene.index.IndexReader;
 import org.apache.lucene.index.Term;
 //import org.apache.lucene.index.Term;
 
-class DeleteFiles {
 
+/** Deletes documents from an index that do not contain a term. */
+public class DeleteFiles {
+  
+  private DeleteFiles() {}                         // singleton
+
+  /** Deletes documents from an index that do not contain a term. */
   public static void main(String[] args) {
     String usage = "java org.apache.lucene.demo.DeleteFiles <unique_term>";
     if (args.length == 0) {

src/demo/org/apache/lucene/demo/IndexFiles.java

@@ -24,10 +24,14 @@ import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.util.Date;
 
-class IndexFiles {
+/** Index all text files under a directory. */
+public class IndexFiles {
+  
+  private IndexFiles() {}
 
   static final File INDEX_DIR = new File("index");
   
+  /** Index all text files under a directory. */
   public static void main(String[] args) {
     String usage = "java org.apache.lucene.demo.IndexFiles <root_directory>";
     if (args.length == 0) {
@@ -64,7 +68,7 @@ class IndexFiles {
     }
   }
 
-  public static void indexDocs(IndexWriter writer, File file)
+  static void indexDocs(IndexWriter writer, File file)
     throws IOException {
     // do not try to index files that cannot be read
     if (file.canRead()) {

src/demo/org/apache/lucene/demo/IndexHTML.java

@@ -26,13 +26,16 @@ import java.io.File;
 import java.util.Date;
 import java.util.Arrays;
 
-class IndexHTML {
+/** Indexer for HTML files. */
+public class IndexHTML {
+  private IndexHTML() {}
 
   private static boolean deleting = false;	  // true during deletion pass
   private static IndexReader reader;		  // existing index
   private static IndexWriter writer;		  // new index being built
   private static TermEnum uidIter;		  // document id iterator
 
+  /** Indexer for HTML files.*/
   public static void main(String[] argv) {
     try {
       String index = "index";

src/demo/org/apache/lucene/demo/SearchFiles.java

@@ -33,7 +33,8 @@ import org.apache.lucene.search.Query;
 import org.apache.lucene.search.Hits;
 import org.apache.lucene.queryParser.QueryParser;
 
-class SearchFiles {
+/** Simple command-line based search demo. */
+public class SearchFiles {
 
   /** Use the norms from one field for all fields.  Norms are read into memory,
    * using a byte of memory per document per searched field.  This can cause
@@ -53,6 +54,9 @@ class SearchFiles {
     }
   }
 
+  private SearchFiles() {}
+
+  /** Simple command-line based search demo. */
   public static void main(String[] args) throws Exception {
     String usage =
       "Usage: java org.apache.lucene.demo.SearchFiles [-index dir] [-field f] [-repeat n] [-queries file] [-raw] [-norms field]";