Thread: what's wrong in this program - Rest api!

Hi , I found an error in these code when I compile it
"uses or overrides a deprecated api"

 
import oauth.signpost.OAuthConsumer;
import oauth.signpost.commonshttp.CommonsHttpOAuthConsumer;
 
import org.apache.commons.io.IOUtils;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
 
 
public class JavaRestTweet {
  static String consumerKeyStr = "####";
  static String consumerSecretStr = "####";
  static String accessTokenStr = "####";
  static String accessTokenSecretStr = "####";
 
 
  public static void main(String[] args) throws Exception {
    OAuthConsumer oAuthConsumer = new CommonsHttpOAuthConsumer(consumerKeyStr,
        consumerSecretStr);
    oAuthConsumer.setTokenWithSecret(accessTokenStr, accessTokenSecretStr);
 
    HttpPost httpPost = new HttpPost(
        "https://api.twitter.com/1.1/statuses/update.json?status=Back%20To%20Study.");
 
    oAuthConsumer.sign(httpPost);
 
    HttpClient httpClient = new DefaultHttpClient();
    HttpResponse httpResponse = httpClient.execute(httpPost);
 
    int statusCode = httpResponse.getStatusLine().getStatusCode();
    System.out.println(statusCode + ':'
        + httpResponse.getStatusLine().getReasonPhrase());
    System.out.println(IOUtils.toString(httpResponse.getEntity().getContent()));
 
  }
}