I have a program which counts the amount of times each word is mentioned in tweets and then stores them in a hash map. A fellow stackexchange member helped me store the top 5 words in a map.
Class where all work is being done:
package readtweets;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import twitter4j.*;
import twitter4j.conf.ConfigurationBuilder;
public class ReadTweets {
//change this to true to enable the print lines
static boolean DEBUG = false;
//Creates map of words
HashMap<String, Integer> wordMap = new HashMap();
/**
* @param args the command line arguments
*/
public HashMap<String, Integer> readTweets(String twitterQuery, String[] args) throws TwitterException {//CHANGE MAIN TO READTWEETS OR SOMETHING
// TODO code application logic here
//Set up user authentication
ConfigurationBuilder configBuilder = new ConfigurationBuilder();
configBuilder.setOAuthConsumerKey("wwwwwwwwwwwwwwwwwwwwwwwww");
configBuilder.setOAuthConsumerSecret("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
configBuilder.setOAuthAccessToken("yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy");
configBuilder.setOAuthAccessTokenSecret("zzzzzzzzzzzzzzzzzzzzzzzzzzzzz");
//Create instance of twitter for searching
TwitterFactory tf = new TwitterFactory(configBuilder.build());
Twitter twitter = tf.getInstance();
//Build Query
Query query = new Query(twitterQuery);
//Number of results pulled each time
query.setCount(100);
//Set the language of the tweets that we want
query.setLang("en");
//How many results do we want to retrieve
int numResults = 400;
//Filter out duplicate tweets and keep track of how many tweets we have downloaded
HashMap<Long, Boolean> tweetIDMap = new HashMap();
//Run query without max_id set
QueryResult result = twitter.search(query);
//Run query until we have the required number of tweets or until there are no more tweets
while (result.getCount() > 0 && tweetIDMap.size() <= numResults) {
//Minimum ID of the retued results. Used to get sequence of tweets
long minID = -1;
//Get the results
List<Status> tweets = result.getTweets();
//Work through the results
for (Status tweet : tweets) {
String userName = tweet.getUser().getName();
long userId = tweet.getUser().getId();
Date creationDate = tweet.getCreatedAt();
String tweetText = tweet.getText();
//Print out the information
if (DEBUG) {
System.out.println("Tweet created by " + userName + "(" + userId + ") on date " + creationDate);
}
if (DEBUG) {
System.out.println("Tweet text: " + tweetText + "n");
}
if (minID == -1 || tweet.getId() < minID) {
minID = tweet.getId();
}
tweetIDMap.put(tweet.getId(), Boolean.TRUE);
//wordMap.put("cat", wordMap.get("cat").intValue()++);
//String hey = new String("hey there world");
for (String word : tweetText.toLowerCase().split("\s+")) {
word = word.replaceAll("^[^a-zA-Z]+", ""); //removes leading punctionation
word = word.replaceAll("[^a-zA-Z]+$", ""); //removes trailing punctionation
word = word.replaceAll("https?://\S+\s?", ""); // removes links
wordMap.put(word, wordMap.getOrDefault(word, 0) + 1);
}
wordMap.remove("");
wordMap.remove("rt");
wordMap.remove("the");
wordMap.remove("to");
wordMap.remove("a");
wordMap.remove("of");
wordMap.remove("and");
wordMap.remove("i");
wordMap.remove("in");
wordMap.remove("have");
wordMap.remove("are");
wordMap.remove("for");
wordMap.remove("is");
wordMap.remove("the");
wordMap.remove("you");
wordMap.remove("my");
wordMap.remove("not");
wordMap.remove("that");
wordMap.remove("me");
wordMap.remove("be");
wordMap.remove("with");
wordMap.remove("like");
wordMap.remove("as");
wordMap.remove("https");
wordMap.remove("they");
wordMap.remove("who");
wordMap.remove("on");
wordMap.remove("but");
wordMap.remove("this");
wordMap.remove("by");
wordMap.remove("so");
wordMap.remove("seen");
wordMap.remove("your");
wordMap.remove("these");
wordMap.remove("do");
wordMap.remove("their");
wordMap.remove("if");
wordMap.remove("just");
//debugging - finds the most common word in hashmap
Map.Entry<String, Integer> maxEntry = null;
for (Map.Entry<String, Integer> entry : wordMap.entrySet()) {
if (maxEntry == null || entry.getValue().compareTo(maxEntry.getValue()) > 0) {
maxEntry = entry;
}
}
System.out.println(maxEntry);
}
query.setMaxId(minID - 1);
result = twitter.search(query);
//Prints the hashmap of words
if (DEBUG) {
System.out.println(wordMap + "n");
}
}
//Prints amount of tweets downloaded
if (DEBUG) {
System.out.println(tweetIDMap.size() + " unique tweets downloaded.");
}
retu wordMap;
}
}
JavaFX Class:
package readtweets;
import java.util.HashMap;
import javafx.application.Application;
import static javafx.application.Application.launch;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import twitter4j.*;
public class Gui extends Application {
TextField tf = new TextField();
//makes the hashmap accessible in this class
ReadTweets tweets = new ReadTweets();
HashMap<String, Integer> wordMap = tweets.getHashmap();
@Override
public void start(Stage primaryStage) {
VBox pane = new VBox();
pane.setSpacing(10);
pane.setAlignment(Pos.CENTER);
Button button = new Button("Ok");
button.setOnAction(new okHandler());
pane.getChildren().add(tf);
pane.getChildren().add(button);
Scene scene = new Scene(pane, 300, 250);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
}
class okHandler implements EventHandler<ActionEvent> {
public void handle(ActionEvent e) {
String text = tf.getText();
String[] strArr = {"cats", "dogs"};
try {
tweets.readTweets(text, strArr);
System.out.println(wordMap);
} catch (TwitterException ex) {
ex.printStackTrace();
}
}
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}
I can retrieve the wordMap hashmap, i tested this by printing the hashmap. However, when i try to print the top5 hashmap, it prints an empty hashmap.
How do i retrieve the top5 hashmap within the javafx class so that i can use the data to create a pie chart?