code: import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.net.MalformedURLException;
  import java.net.URISyntaxException;
  import java.net.URL;
  import java.net.URLDecoder;
  import java.net.URLEncoder;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  class YahooSearch {
      private String query;
      // Page number
      private int page = 1;
      // Regexp to look for the individual results in the returned page
      private static final Pattern pattern = Pattern.compile(
          "<a class=\"yschttl spt\" href=\"[^*]+?\\*\\*([^\"]+?)\">(.+?)</a></h3>.*?<div class=\"(?:sm-abs|abstr)\">(.+?)</div>");
  
      public YahooSearch(String query) {
          this.query = query;
      }
  
      public List<YahooResult> search() throws MalformedURLException, URISyntaxException, IOException {
          // Build the search string, starting with the Yahoo search URL,
          // then appending the query and optionally the page number (if > 1)
          StringBuilder searchUrl = new StringBuilder("http://search.yahoo.com/search?");
          searchUrl.append("p=").append(URLEncoder.encode(query, "UTF-8"));
          if (page > 1) {searchUrl.append("&b=").append((page - 1) * 10 + 1);}
          // Query the Yahoo search engine
          URL url = new URL(searchUrl.toString());
          List<YahooResult> result = new ArrayList<YahooResult>();
          StringBuilder sb = new StringBuilder();
          // Get the search results using a buffered reader
          BufferedReader in = null;
          try {
              in = new BufferedReader(new InputStreamReader(url.openStream()));
              // Read the results line by line
              String line = in.readLine();
              while (line != null) {
                  sb.append(line);
                  line = in.readLine();
              }
          }
          catch (IOException ioe) {
              ioe.printStackTrace();
          }
          finally {
              try {in.close();} catch (Exception ignoreMe) {}
          }
          String searchResult = sb.toString();
          // Look for the individual results by matching the regexp pattern
          Matcher matcher = pattern.matcher(searchResult);
          while (matcher.find()) {
              // Extract the result URL, title and excerpt
              String resultUrl = URLDecoder.decode(matcher.group(1), "UTF-8");
              String resultTitle = matcher.group(2).replaceAll("</?b>", "").replaceAll("<wbr ?/?>", "");
              String resultContent = matcher.group(3).replaceAll("</?b>", "").replaceAll("<wbr ?/?>", "");
              // Create a new YahooResult and add to the list
              result.add(new YahooResult(resultUrl, resultTitle, resultContent));
          }
          return result;
      }
  
      public List<YahooResult> search(int page) throws MalformedURLException, URISyntaxException, IOException {
          // Set the page number and search
          this.page = page;
          return search();
      }
  
      public List<YahooResult> nextPage() throws MalformedURLException, URISyntaxException, IOException {
          // Increment the page number and search
          page++;
          return search();
      }
  
      public List<YahooResult> previousPage() throws MalformedURLException, URISyntaxException, IOException {
          // Decrement the page number and search; if the page number is 1 return an empty list
          if (page > 1) {
              page--;
              return search();
          } else return new ArrayList<YahooResult>();
      }
  }
  
  class YahooResult {
      private URL url;
      private String title;
      private String content;
  
      public URL getUrl() {
          return url;
      }
  
      public void setUrl(URL url) {
          this.url = url;
      }
  
      public void setUrl(String url) throws MalformedURLException {
          this.url = new URL(url);
      }
  
      public String getTitle() {
          return title;
      }
  
      public void setTitle(String title) {
          this.title = title;
      }
  
      public String getContent() {
          return content;
      }
  
      public void setContent(String content) {
          this.content = content;
      }
  
      public YahooResult(URL url, String title, String content) {
          setUrl(url);
          setTitle(title);
          setContent(content);
      }
  
      public YahooResult(String url, String title, String content) throws MalformedURLException {
          setUrl(url);
          setTitle(title);
          setContent(content);
      }
  
      @Override
      public String toString() {
          StringBuilder sb = new StringBuilder();
          if (title != null) {
              sb.append(",title=").append(title);
          }
          if (url != null) {
              sb.append(",url=").append(url);
          }
          return sb.charAt(0) == ',' ? sb.substring(1) : sb.toString();
      }
  }
  
  public class TestYahooSearch {
      public static void main(String[] args) throws MalformedURLException, URISyntaxException, IOException {
          // Create a new search
          YahooSearch search = new YahooSearch("Rosetta code");
          // Get the search results
          List<YahooResult> results = search.search();
          // Show the search results
          for (YahooResult result : results) {
              System.out.println(result.toString());
          }
      }
  }
  