Very Simple Java Twitter Bot (using Twitter4J)

DFTwittterBot.java

package test;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.List;

import twitter4j.Status;
import twitter4j.StatusUpdate;
import twitter4j.Twitter;
import twitter4j.TwitterException;
import twitter4j.TwitterFactory;
import twitter4j.auth.AccessToken;
import twitter4j.auth.RequestToken;

public class DFTwitterBot implements Serializable {
private Twitter twitter;
private AccessToken aT;
private long aTID;

public static void main(String args[]) throws Exception{
DFTwitterBot dftb = new DFTwitterBot();

File file=new File("twitterdetails.dftb");
boolean exists = file.exists();
if (exists) {
dftb = readObject(dftb);
}else if(!exists){
getTwitterAccess(dftb);
}

menu(dftb);

}

private static void menu(DFTwitterBot dftb) throws TwitterException, IOException {
System.out.println("DF Bot Menu");
System.out.println("1. Update Status");
System.out.println("2. View Timeline");
System.out.println("3. Exit");

System.out.println("Please enter your choice:");

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String option = br.readLine();
int a =Integer.parseInt( option );

switch(a){
case 1: updateStatus(dftb);
case 2: viewTimeline(dftb);
case 3: System.out.println("Bye!"); System.exit(0);
default: menu(dftb);
}

}

private static void viewTimeline(DFTwitterBot dftb) throws TwitterException {
List statuses = dftb.twitter.getFriendsTimeline();
System.out.println("Showing friends timeline.");
for (Status status : statuses) {
System.out.println(status.getUser().getName() + ":" +
status.getText());
}

}

private static DFTwitterBot readObject(DFTwitterBot dftb) {
try
{
FileInputStream fileIn =
new FileInputStream("twitterdetails.dftb");
ObjectInputStream in = new ObjectInputStream(fileIn);
dftb = (DFTwitterBot) in.readObject();
in.close();
fileIn.close();
}catch(IOException i)
{
i.printStackTrace();
return dftb;
}catch(ClassNotFoundException c)
{
System.out.println(" DFTB class not found");
c.printStackTrace();
return dftb;
}

System.out.println("Deserialized Access...");
System.out.println("Access Token ID: " + dftb.aTID);
System.out.println("Access Token: " + dftb.aT.toString());
System.out.println("Tweitter: " + dftb.twitter.toString());
return dftb;

}

private static void updateStatus(DFTwitterBot dftb) throws TwitterException, IOException {
String statusUpdate = null;

System.out.println("Please enter a status:");
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
statusUpdate = br.readLine();
if(statusUpdate.length() >0){
StatusUpdate su = new StatusUpdate(statusUpdate);
Status status = dftb.twitter.updateStatus(su);
System.out.println("Successfully updated the status to [" + status.getText() + "].");
} else{
menu(dftb);
}
}

private static void getTwitterAccess(DFTwitterBot dftb) throws IOException, TwitterException {
// The factory instance is re-useable and thread safe.
dftb.twitter = new TwitterFactory().getInstance();
dftb.twitter.setOAuthConsumer("[consumer key]", "[consumer secret]");
RequestToken requestToken = dftb.twitter.getOAuthRequestToken();
dftb.aT = null;
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
while (null == dftb.aT) {
System.out.println("Open the following URL and grant access to your account:");
System.out.println(requestToken.getAuthorizationURL());
System.out.print("Enter the PIN(if aviailable) or just hit enter.[PIN]:");
String pin = br.readLine();
try{
if(pin.length() > 0){
dftb.aT = dftb.twitter.getOAuthAccessToken(requestToken, pin);
}else{
dftb.aT = dftb.twitter.getOAuthAccessToken();
}
} catch (TwitterException te) {
if(401 == te.getStatusCode()){
System.out.println("Unable to get the access token.");
}else{
te.printStackTrace();
}
}

}

dftb.aTID = dftb.twitter.verifyCredentials().getId();
writeObject(dftb);
//System.exit(0);
}

private static void writeObject(DFTwitterBot dftb) throws IOException {
FileOutputStream fileOut =
new FileOutputStream("twitterdetails.dftb");
ObjectOutputStream out =
new ObjectOutputStream(fileOut);
System.out.println("Serialising:...");
System.out.println("Access Token ID: " + dftb.aTID);
System.out.println("Access Token: " + dftb.aT.toString());
System.out.println("Tweitter: " + dftb.twitter.toString());
out.writeObject(dftb);
out.close();
fileOut.close();

}
}

very easy to follow, one of the best I've come across. Thank you!