wordsearchexample.java

java 完全探索的随书源码

import java.util.StringTokenizer;
import java.io.*;

public class WordSearchExample
{
  private String fileName = null;

  // Default Constructor
  public WordSearchExample( String fileName )
  {
    super();
    this.fileName = fileName;
  }

  // Private Accessor
  private String getFilename()
  {
    return fileName;
  }

  // Method that actually performs the search
  public int doSearch( String word )
  {
    LineNumberReader reader = null;
    int count = 0;
    StringTokenizer tokenizer = null;
    String currentString = null;
    String tempString = null;
    try
    {
      reader = new LineNumberReader( new FileReader( getFilename() ) );
      while( (currentString = reader.readLine()) != null )
      {

        // No sense tokenizing an empty string
        if ( currentString.equals( "" ) )
          continue;

        System.out.println( "Searching: " + currentString );
        tokenizer = new StringTokenizer( currentString );
        while( tokenizer.hasMoreTokens() )
        {
          tempString = tokenizer.nextToken();
          if ( !tempString.equals("") && tempString.equals( word ))
          {
            System.out.println( "Found on line " + reader.getLineNumber() + ": " + currentString );
            System.out.println( "\n" );
            count++;
          }
        }
      }
    }
    catch( IOException ex )
    {
      System.out.println( "Problem locating or opening the file: " + getFilename() );
    }

    // return the number of instances that were found
    return count;
  }

  // Main Method
  public static void main( String[] args )
  {
    if ( args.length != 2 )
    {
      System.out.println( "Usage: java WordSearchExample <Filename>" );
      System.exit( 0 );
    }

    // Get the strings passed in from the command line
    String fileName = args[0];
    String word = args[1];

    // Create an instance of the Example Class
    WordSearchExample example = new WordSearchExample( args[0] );

    int count = example.doSearch( word );
    System.out.println ( count + " instances of the word: " + word + " found!" );
  }
}