Develop Reference

Printing textdata from toString - Java

I am working on a personal Java project and learning how to print out data from a text file. My code (as you can see below) prints out the userNameGenerator and personName data perfectly fine but I want it to be printed out from the toString in my Java Class. How can I change my code to print it out from there?
This is how my toString looks like:
#Override
public String toString() {
return userNameGenerator + " -> " + "[" + personName + "]" ;
}
Full code:
import java.util.*;
import java.io.*;
public class Codes {
public static void main(String[] args) {
List<Codes2> personFile = new ArrayList<>();
try {
BufferedReader br = new BufferedReader(new FileReader("person-data.txt"));
String fileRead = br.readLine();
while (fileRead != null) {
String[] personData = fileRead.split(":");
String personName = personData[0];
String userNameGenerator = personData[1];
Codes2 personObj = new Codes2(personName, userNameGenerator);
personFile.add(personObj);
fileRead = br.readLine();
}
br.close();
}
catch (FileNotFoundException ex) {
System.out.println("File not found!");
}
catch (IOException ex) {
System.out.println("An error has occured: " + ex.getMessage());
}
Set<String> newStrSet = new HashSet<>();
for(int i = 0; i < personFile.size(); i++){
String[] regionSplit = personFile.get(i).getUserNameGenerator().split(", ");
for(int j = 0; j < regionSplit.length; j++){
newStrSet.add(regionSplit[j]);
}
}
for (String p: newStrSet) {
System.out.printf("%s -> ", p);
for (Codes2 s: personFile) {
if (s.getUserNameGenerator().contains(p)) {
System.out.printf("%s, ", s.getPersonName());
}
}
System.out.println();
}
}
}
Java Class:
public class Codes2 implements Comparable<Codes2> {
private String personName;
private String userNameGenerator;
public Codes2(String personName, String userNameGenerator) {
this.personName = personName;
this.userNameGenerator = userNameGenerator;
}
public String getPersonName() {
return personName;
}
public String getUserNameGenerator() {
return userNameGenerator;
}
#Override
public int compareTo(Codes2 o) {
return getUserNameGenerator().compareTo(o.getUserNameGenerator());
}
public int compare(Object lOCR1, Object lOCR2) {
return ((Codes2)lOCR1).userNameGenerator
.compareTo(((Codes2)lOCR2).userNameGenerator);
}
#Override
public String toString() {
return userNameGenerator + " -> " + "[" + personName + "]" ;
}
}

Everything looks right in your code.
I think you should just call the method when you are trying to print it out:
for (Codes2 s: personFile) {
if (s.getUserNameGenerator().contains(p)) {
System.out.printf("%s, ", s.toString());
}
}
This follows the fact that the class that prints out the object is not so closely coupled with the class that hold the data.

Try:
#Override
public String toString() {
return String.format("%s -> [%s]",this.userNameGenerator,this.personName);
}

Java JSON weird error

When I run my program I am getting the error:
org.json.JSONException: A JSONObject text must begin with '{' at 1 [character 2 line 1]
at org.json.JSONTokener.syntaxError(JSONTokener.java:432)
at org.json.JSONObject.<init>(JSONObject.java:184)
at MovieLibrary.<init>(MovieLibrary.java:76)
at LibraryOfMovieDescriptions.main(LibraryOfMovieDescriptions.java:11)
Also, once I run the program, I check how my "movies2.json" has changed because that's the one I'm writing to to save the file, and it changes from initially only the file being { } to the file then being ’ t {}
I don't how I end up getting that in "movies2.json".
"movies.json", the file being used in the MovieLibrary constructor is this:
{ "Minions Puppy": {
"Released": "10 Dec 2013",
"Rated": "NR",
"Actors": ["Dave", "Gru"],
"Plot": "Dave seeing many owners walk their dogs wants a puppy of his own. He finds a mini-UFO who becomes his pal. This short film released with Despicable Me 2 chronicles how Dave helps the UFO return home.",
"Runtime": "4:16 min",
"Genre": ["Animation", "Family", "Cartoon"],
"Filename": "MinionsPuppy.mp4",
"Title": "Minions Puppy"
},
"Pretty Woman": {
"Released": "10 Dec 1973",
"Rated": "NR",
"Actors": ["Roy Orbison"],
"Plot": "One of Roys most famous songs.",
"Runtime": "3 min",
"Genre": ["Country Music"],
"Filename": "RoyOrbisonPrettyWoman.mp4",
"Title": "Pretty Woman"
},
"Minions Banana Song": {
"Released": "12 Dec 2015",
"Rated": "PG",
"Actors": ["Steve", "Kevin", "Bob", "Stuart"],
"Plot": "Banana is a song sung by The Minions in the teaser trailer of Despicable Me 2. It is a parody of the Beach Boys Barbara Ann. One minion gets annoyed by another, most likely Stuart, who keeps on playing his party horn while they are singing. So, at the end, he punched Stuart.",
"Runtime": "5 min",
"Genre": ["Animation", "Family", "Cartoon"],
"Filename": "MinionsBananaSong.mp4",
"Title": "Minions Banana Song"
},
"Minions Banana": {
"Released": "12 Dec 2015",
"Rated": "PG",
"Actors": ["Steve", "Kevin", "Stuart"],
"Plot": "Minions fight over a banana. In the process, they wreak havoc in the Bomb Factory.",
"Runtime": "5 min",
"Genre": ["Animation", "Family", "Cartoon"],
"Filename": "MinionsBanana.mp4",
"Title": "Minions Banana"
},
"Squatters Rights": {
"Released": "07 Jun 1946",
"Rated": "N/A",
"Actors": ["Dessie Flynn", "James MacDonald"],
"Plot": "Chip-n-Dale have set up house in the wood stove of Mickeys cabin. Pluto knows they are there, but Mickey only knows his matches keep going out when he tries to light a fire.",
"Runtime": "7 min",
"Genre": ["Cartoon", "Animation", "Family"],
"Filename": "MMSquattersRights.mp4",
"Title": "Squatters Rights"
}
}
So I would really love any help or explanation. Thanks in advance.
Here is the code:
MAIN CLASS
import java.io.Serializable;
class LibraryOfMovieDescriptions implements Serializable {
public static void main(String[] args){
MovieLibrary movieLibrary;
movieLibrary = new MovieLibrary("movies.json");
movieLibrary.toJsonFile("movies2.json");
}
}
MovieDescription Class
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONArray;
import java.io.Serializable;
public class MovieDescription implements Serializable {
private String title;
private String rating;
private String release;
private String runtime;
private String plot;
private String filename;
private String genre;
private String actors;
public JSONObject toJSONObject() throws JSONException {
JSONObject obj = new JSONObject();
obj.put("Title", title);
obj.put("Rated", rating);
obj.put("Released", release);
obj.put("Runtime", runtime);
obj.put("Plot", plot);
obj.put("Filename", filename);
JSONArray a = new JSONArray();
String[] sArray = this.actors.split(" , ");
for(int i = 0; i < sArray.length; i++){
a.put(i);
}
obj.put("Actors", a);
JSONArray g = new JSONArray();
String[] gArray = this.genre.split(" , ");
for(int i = 0; i < gArray.length; i++){
g.put(i);
}
obj.put("Genre", g);
return obj;
}
public MovieDescription(JSONObject jsonObj) throws JSONException{
this.title = jsonObj.getString("Title");
this.rating = jsonObj.getString("Rated");
this.release = jsonObj.getString("Released");
this.plot = jsonObj.getString("Plot");
this.runtime = jsonObj.getString("Runtime");
this.filename = jsonObj.getString("Filename");
JSONArray g = jsonObj.getJSONArray("Genre");
for(int i = 0; i < g.length(); i++){
this.genre += g.get(i) + ", ";
}
JSONArray a = jsonObj.getJSONArray("Actors");
for(int i = 0; i < a.length(); i++){
this.actors += a.get(i) + ", ";
}
}
public MovieDescription(){
title = " ";
rating = " ";
release = " ";
runtime = " ";
plot = " ";
filename = " ";
genre = " ";
actors = " ";
}
public MovieDescription(String title, String rating, String release, String runtime, String plot, String filename,
String genre, String actors){
this.title = title;
this.rating = rating;
this.release = release;
this.runtime = runtime;
this.plot = plot;
this.filename = filename;
this.genre = genre;
this.actors = actors;
}
public void setTitle(String title){
this.title = title;
}
public String getTitle(){
return title;
}
public void setRating(String rating){
this.rating = rating;
}
public String getRating(){
return rating;
}
public void setRelease(String release){
this.release = release;
}
public String getRelease(){
return this.release;
}
public void setRuntime(String runtime){
this.runtime = runtime;
}
public String getRuntime(){
return runtime;
}
public void setPlot(String plot){
this.plot = plot;
}
public String getPlot(){
return plot;
}
public void setFilename(String filename){
this.filename = filename;
}
public String getFilename(){
return filename;
}
public void setGenre(String genre){
this.genre = genre;
}
public String getGenre(){
return genre;
}
public void setActors(String actors){
this.actors = actors;
}
public String getActors(){
return actors;
}
public String toString(){
String string = ("Title: " + title + "\n" + "Rating: " + rating + "\n" + "Released: " + release + "\n" +
"Runtime: " + runtime + "\n" + "Plot: " + plot + "\n" + "Filename: " + filename + "\n" + "Genre: " + genre
+ "\n" + "Actors: " + actors + "\n");
return string;
}
}
MovieLibrary Class
import org.json.JSONObject;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.json.JSONTokener;
import java.io.Serializable;
import java.io.ObjectOutputStream;
public class MovieLibrary implements Serializable {
private List<MovieDescription> movieLib = new ArrayList<MovieDescription>();
private int arraySize;
public MovieLibrary(){
arraySize = 0;
}
public boolean isEmpty(){
return arraySize == 0;
}
public MovieDescription get(String aTitle){
int i = indexOf(aTitle);
if(i == -1){
return null;
}
return movieLib.get(i);
}
public boolean add(MovieDescription aClip){
movieLib.add(aClip);
arraySize++;
return true;
}
public boolean remove(String aTitle){
int i = indexOf(aTitle);
if(i != -1){
movieLib.remove(i);
arraySize--;
}
return true;
}
public String[] getTitles(){
String[] s = new String[movieLib.size()];
for(int i = 0; i < movieLib.size(); i++){
s[i] = movieLib.get(i).getTitle();
}
return s;
}
private int indexOf(String aTitle){
for(int i = 0; i < movieLib.size(); i++)
if(((movieLib.get(i)).getTitle()).equals(aTitle)){
return i;
}
return -1;
}
public MovieLibrary(String jsonFile){
FileInputStream in = null;
JSONObject jsonObj = null;
String[] titles;
try{
in = new FileInputStream(jsonFile);
jsonObj = new JSONObject(new JSONTokener(in));
titles = JSONObject.getNames(jsonObj);
System.out.println("Adding Movies...");
for(int i = 0; i < titles.length; i++){
System.out.println(titles[i]);
JSONObject temp = jsonObj.getJSONObject(titles[i]);
MovieDescription movies = new MovieDescription(temp);
movieLib.add(movies);
}
System.out.println(movieLib);
in.close();
}
catch(Exception e){
e.printStackTrace();
if(in != null){
try{
in.close();
}
catch(IOException z){
z.printStackTrace();
System.exit(0);
}
}
}
}
public void toJsonFile(String jsonFileName){
JSONObject jsonObj = new JSONObject();
ObjectOutputStream out = null;
try{
for(int i = 0; i < movieLib.size(); i++)
jsonObj.put(movieLib.get(i).getTitle(),movieLib.get(i).toJSONObject());
out = new ObjectOutputStream(new FileOutputStream(jsonFileName));
out.writeObject(jsonObj.toString());
out.close();
}
catch(Exception e){
e.printStackTrace();
if(out != null){
try{
out.close();
}
catch(IOException z){
z.printStackTrace();
System.exit(0);
}
}
}
}
}

You don't want to use an ObjectOutputStream to write text. It's writing a serialized Java string and that explains the weird characters at the start of your file. Try using a FileWriter instead.
public void toJsonFile(String jsonFileName) {
JSONObject jsonObj = new JSONObject();
FileWriter out = null;
try{
for(int i = 0; i < movieLib.size(); i++)
jsonObj.put(movieLib.get(i).getTitle(),movieLib.get(i).toJSONObject());
out = new FileWriter(jsonFileName);
out.write(jsonObj.toString());
out.close();
}
catch(Exception e){
e.printStackTrace();
if(out != null){
try{
out.close();
}
catch(IOException z){
z.printStackTrace();
System.exit(0);
}
}
}
}
P.S. You might also change your try/catch block to a try-with-resources statement.

Get data from file - Buffered Reader

I would just have the id, the content and the hashtag and time of every tweet in a text file, and I dont know how to store infomration in lists of tweet,
I created a tweet class as follows:
public class Tweet {
private String type;
private String origin;
private String tweetText;
private String url;
private String tweetID;
private String tweetDate;
private int retCount;
private String favourit;
private String mEntities;
private String hashtags;
public Tweet(String tweetID,String origin) {
this.tweetID = tweetID;
this.origin = origin;
}
public Tweet(String type, String origin, String tweetText, String url, String tweetID, String tweetDate, int retCount, String favourit, String mEntities, String hashtags) {
this.type = type;
this.origin = origin;
this.tweetText = tweetText;
this.url = url;
this.tweetID = tweetID;
this.tweetDate = tweetDate;
this.retCount = retCount;
this.favourit = favourit;
this.mEntities = mEntities;
this.hashtags = hashtags;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getOrigin() {
return origin;
}
public void setOrigin(String origin) {
this.origin = origin;
}
public String getTweetText() {
return tweetText;
}
public void setTweetText(String tweetText) {
this.tweetText = tweetText;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getTweetID() {
return tweetID;
}
public void setTweetID(String tweetID) {
this.tweetID = tweetID;
}
public String getTweetDate() {
return tweetDate;
}
public void setTweetDate(String tweetDate) {
this.tweetDate = tweetDate;
}
public int getRetCount() {
return retCount;
}
public void setRetCount(int retCount) {
this.retCount = retCount;
}
public String getFavourit() {
return favourit;
}
public void setFavourit(String favourit) {
this.favourit = favourit;
}
public String getmEntities() {
return mEntities;
}
public void setmEntities(String mEntities) {
this.mEntities = mEntities;
}
public String getHashtags() {
return hashtags;
}
public void setHashtags(String hashtags) {
this.hashtags = hashtags;
}
and my data file has the following format:
***
***
Type:status
Origin: Here's link to listen live to our discussion of #debtceiling #politics :
Text: Here's link to listen live to our discussion of :
URL:
ID: 96944336150867968
Time: Fri Jul 29 09:05:05 CDT 2011
RetCount: 0
Favorite: false
MentionedEntities:
Hashtags: debtceiling politics
***
***
Type:status
Origin: Now we're talking #debtceiling w/ Dick Polman #NewsWorksWHYY #PhillyInquirer & Bill Galston #BrookingsInst #NoLabelsOrg
Text: Now we're talking w/ Dick Polman & Bill Galston
URL:
ID: 96943803600089088
Time: Fri Jul 29 09:02:58 CDT 2011
RetCount: 1
Favorite: false
MentionedEntities: 136337303 151106990 14495726 15161791
Hashtags: debtceiling
***
***
I want to read this file and stock information into lists, i begin with this code, but i dont know how to solve that
public static List<String> readTweets(File file) throws IOException {
List<String> tweets = new ArrayList<String>();
//logger.info("Read tweets from {}", file.getAbsolutePath());
BufferedReader reader = new BufferedReader(new FileReader(file));
String line;
String[] fields;
while ((line = reader.readLine()) != null) {
fields = line.split(",");
if (fields.length > 1)
tweets.add(fields[1]);
}
return tweets;
}

By the looks of the code you are experimenting with, this is what I would do:
public static List<String> readTweets(File file) throws IOException {
List<String> tweets = new ArrayList<String>();
List<String> lines = Files.readAllLines(file.toPath());
for(int i = 0; i < lines.length(); i++){
String line = lines.get(i);
String[] part = line.split(",");
if(part.length < 1) tweets.add(part[i]);
}
}
But, if I wrote an application that was purely for printing the contents of tweets into the console, here's how I'd do it:
TweetReader.java
package Testers;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.List;
public class TweetReader {
public static List<Tweet> readTweets(File file) throws IOException {
boolean processEnd = false;
String type = "";
String origin = "";
String tweetText = "";
String url = "";
String tweetID = "";
String tweetDate = "";
int retCount = 0;
String favourite = "";
String mEntities = "";
String hashTags = "";
List<Tweet> tweets = new ArrayList<Tweet>();
List<String> lines = Files.readAllLines(file.toPath());
for(int i = 0; i < lines.size(); i++){
String line = lines.get(i);
line = line.trim();
if(line.equals("***")){
if(processEnd){
Tweet tweet = new Tweet(type, origin, tweetText, url, tweetID, tweetDate, retCount, favourite, mEntities, hashTags);
tweets.add(tweet);
processEnd = false;
}else processEnd = true;
}else{
if(line.contains(":")){
String header = line.substring(0, line.indexOf(":"));
//System.out.println(header); //You can uncomment this for troubleshooting
if(header.equals("Type")) type = line.substring(line.length() > 5 ? 5 : line.length());
else if(header.equals("Origin")) origin = line.substring(line.length() > 8 ? 8 : line.length());
else if(header.equals("Text")) tweetText = line.substring(line.length() > 6 ? 6 : line.length());
else if(header.equals("URL")) url = line.substring(line.length() > 5 ? 5 : line.length());
else if(header.equals("ID")) tweetID = line.substring(line.length() > 4 ? 4 : line.length());
else if(header.equals("Time")) tweetDate = line.substring(line.length() > 6 ? 6 : line.length());
else if(header.equals("RetCount")) retCount = Integer.parseInt(line.substring(line.length() > 10 ? 10 : line.length()));
else if(header.equals("Favorite")) favourite = line.substring(line.length() > 11 ? 11 : line.length());
else if(header.equals("MentionedEntities")) mEntities = line.substring(line.length() > 19 ? 19 : line.length());
else if(header.equals("Hashtags")) hashTags = line.substring(line.length() > 10 ? 10 : line.length());
else throw new IOException("Line cannot be identified as part of a tweet:" + line);
}else throw new IOException("Line cannot be processed:" + line);
}
}
return tweets;
}
public static void main(String[] args){
File log = new File("log.txt");
List<Tweet> tweets = new ArrayList<Tweet>();
try {
File f = new File(".").getAbsoluteFile();
File[] array = f.listFiles();
for(int i = 0; i < array.length; i++){
File tweet = array[i];
if(tweet.isFile() && !tweet.getName().contains("log.txt") && !tweet.getName().contains(".jar")){
log("Reading file: " + tweet.getAbsolutePath(), log);
List<Tweet> tweetlist = readTweets(tweet);
tweets.addAll(tweetlist);
}
}
System.out.println("Reading tweets now");
for(int i = 0; i < tweets.size(); i++){
Tweet t = tweets.get(i);
log("Type = " + t.getType(), log);
log("Origin = " + t.getOrigin(), log);
log("Text = " + t.getTweetText(), log);
log("URL = " + t.getURL(), log);
log("ID = " + t.getTweetID(), log);
log("Date = " + t.getTweetDate(), log);
log("Ret count = " + t.getRetCount(), log);
log("Favourite = " + t.getFavourite(), log);
log("Mentioned entities = " + t.getMentionedEntities(), log);
log("Hashtags = " + t.getHashtags(), log);
log("Tweet finished", log);
}
} catch (IOException e) {
log(e, log);
}
log("Finished reading tweets.", log);
}
private static void log(IOException e, File log) {
log(e.getMessage(), log);
StackTraceElement[] array = e.getStackTrace();
for(int i = 0; i < array.length; i++){
log(" " + array[i], log);
}
}
private static void log(String string, File log) {
try {
BufferedWriter writer = new BufferedWriter(new FileWriter(log, true));
writer.write(string);
writer.newLine();
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
Tweet.java
package Testers;
public class Tweet {
private String type;
private String origin;
private String tweetText;
private String url;
private String tweetID;
private String tweetDate;
private int retCount;
private String favourit;
private String mEntities;
private String hashtags;
public Tweet(String tweetID,String origin) {
this.tweetID = tweetID;
this.origin = origin;
}
public Tweet(String type, String origin, String tweetText, String url, String tweetID, String tweetDate, int retCount, String favourit, String mEntities, String hashtags) {
this.type = type;
this.origin = origin;
this.tweetText = tweetText;
this.url = url;
this.tweetID = tweetID;
this.tweetDate = tweetDate;
this.retCount = retCount;
this.favourit = favourit;
this.mEntities = mEntities;
this.hashtags = hashtags;
}
public String getType() {
return type;
}
public String getOrigin(){
return origin;
}
public String getTweetText(){
return tweetText;
}
public String getURL(){
return url;
}
public String getTweetID(){
return tweetID;
}
public String getTweetDate(){
return tweetDate;
}
public int getRetCount(){
return retCount;
}
public String getFavourite(){
return favourit;
}
public String getMentionedEntities(){
return mEntities;
}
public String getHashtags(){
return hashtags;
}
}

//global attribute
List<Tweet> tweetList = new ArrayList<>();
String line = "";
String[] fields;
while (line != null) {
line = reader.readLine();
line = reader.readLine();
//these two are for ***
for(int i = 0;i<10;i++){
line = reader.readLine();
tweets.add(line);
// these are for the other data
}
Tweet tweet = createTweetFromList(tweets);
tweetList.add(tweet);
}

Reading textfile with multiple elements into arraylist (set and get)

I am trying to read from a text file of the type (Artist, Title, Genre, Recordcompany, Release year, Number of songs, Playtime):
The Beatles, Abbey Road, Rock, Apple Records, 1969, 17, 47.16
Sia, 1000 Forms of Fear, Pop, Intertia, 2014, 12, 48.41
Taylor Swift, Speak Now
I have created a CD class:
package q;
public class CD {
//
private String artist;
private String titel;
private String genre;
private String recordcompany;
private int year; //
private int songs; //
private double playtime; //
public CD() { //
}
public CD(String newArtist, String newTitel) {
artist = newArtist;
titel = newTitel;
}
public CD(String newArtist, String newTitel, String newGenre, String newRecordcompany, int newYear, int newSongs, double newPlaytime) {
artist = newArtist;
titel = newTitel;
genre = newGenre;
recordcompany = newRecordcompany;
year = newYear;
songs = newSongs;
playtime = newPlaytime;
}
public String getArtist() { //
return artist;
}
public String getTitel() {
return titel;
}
public String getGenre() {
return genre;
}
public String getRecordcompany() {
return recordcompany;
}
public int getYear() {
return year;
}
public int getsong() {
return songs;
}
public double getPlaytime() {
return playtime;
}
public void setArtist(String newArtist) { //
artist = newArtist;
}
public void setTitel(String newTitel) {
titel = newTitel;
}
public void setGenre(String newGenre) {
genre = newGenre;
}
public void setRecordcompany(String newRecordcompany) {
recordcompany = newRecordcompany;
}
public void setYear(int newYear) {
year = newYear;
}
public void setSongs(int newSongs) {
songs = newSongs;
}
public void setplaytime(double newPlaytime) {
playtime = newPlaytime;
}
#
Override public String toString() { //
return ("Artist " + artist + System.lineSeparator() + "Titel: " + titel + System.lineSeparator() + "Genre: " + genre + System.lineSeparator() + "Recordcompany: " + recordcompany + System.lineSeparator() + "Year: " + year + System.lineSeparator() + "Songs: " + songs + System.lineSeparator() + "Playtime: " + playtime + System.lineSeparator());
}
}
I am trying to read from the text file and then convert it into a arraylist. I know I have overcomplicated it by first conerting the text file to a string array and then converting it to an arraylist. I would like to use set and get methods when I create the array, if it is possible. I wonder if any of you have any tips for me for how I can make the code less complicated and include set and get methods if possible, thank you.
package q;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
public class Q {
public static void main(String[] args) throws FileNotFoundException {
String artist = "";
String titel = "";
String genre = "";
String recordcompany = "";
String year = "";
String songs = "";
String playtime = "";
try {
BufferedReader br = new BufferedReader(new FileReader("nej.txt"));
String line = null;
while ((line = br.readLine()) != null) {
String tmp[] = line.split(",");
artist = tmp[0];
titel = tmp[1];
if (tmp.length > 2) {
genre = tmp[2];
recordcompany = tmp[3];
year = (tmp[4]);
songs = (tmp[5]);
playtime = (tmp[6]);
} else {
genre = "";
recordcompany = "";
year = "";
songs = "";
playtime = "";
}
List < String > unsorted = Arrays.asList(tmp);
for (String e: unsorted) {
System.out.println(e);
}
}
br.close();
} catch (IOException e) {
System.out.println(e);
}
}
}
EDITED
package q;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class Q {
public static void main(String[] args) throws FileNotFoundException {
String artist = "";
String titel = "";
String genre = "";
String recordcompany = "";
int year = 0;
int songs = 0;
double playtime = 0.0;
try {
BufferedReader br = new BufferedReader(new FileReader("nej.txt"));
String line = null;
List < CD > cdsList = new ArrayList < > ();
while ((line = br.readLine()) != null) {
CD cd = new CD();
String tmp[] = line.split(",");
cd.setArtist(tmp[0]);
cd.setTitel(tmp[1]);
if (tmp.length > 2) {
cd.setGenre(tmp[2]);
cd.setRecordcompany(tmp[3]);
cd.setYear(Integer.parseInt(tmp[4].trim()));
cd.setSongs(Integer.parseInt(tmp[5].trim()));
cd.setplaytime(Double.parseDouble(tmp[6].trim()));
}
System.out.println(cdsList);
}
br.close();
} catch (IOException e) {
System.out.println(e);
}
}
}

Something like below.
public static void main(String[] args) {
try {
BufferedReader br = new BufferedReader(new FileReader("nej.txt"));
String line = null;
List < CD > cdsList = new ArrayList < > ();
while ((line = br.readLine()) != null) {
CD cd = new CD();
String tmp[] = line.split(",");
cd.setArtist(tmp[0]);
cd.setTitel(tmp[1]);
if (tmp.length > 2) {
cd.setGenre(tmp[2]);
cd.setRecordcompany(tmp[3]);
cd.setYear(Integer.parseInt(tmp[4].trim()));
cd.setSongs(Integer.parseInt(tmp[5].trim()));
cd.setplaytime(Double.parseDouble(tmp[6].trim()));
}
cdsList.add(cd);
}
System.out.println(cdsList);
br.close();
} catch (IOException e) {
System.out.println(e);
}
}

Google search API return false

I have tool code use Google search API.
My code:
import com.google.gson.Gson;
class GoogleResults {
private ResponseData responseData;
public ResponseData getResponseData() {
return responseData;
}
public void setResponseData(ResponseData responseData) {
this.responseData = responseData;
}
public String toString() {
return "ResponseData[" + responseData + "]";
}
static class ResponseData {
private List<Result> results;
public List<Result> getResults() {
return results;
}
public void setResults(List<Result> results) {
this.results = results;
}
public String toString() {
return "Results[" + results + "]";
}
}
static class Result {
private String url;
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String toString() {
return "Result[url:" + url + " ]";
}
}
}
public class CrawData {
public static void main(String[] args) throws IOException, InterruptedException {
String query;
int n;
int k=0;
String site;
String resultset;
Scanner st = new Scanner(System.in);
System.out.print(" Input key search: ");
query = st.nextLine();
System.out.print("Input site: ");
site = st.nextLine();
System.out.print("Input number of result: ");
n = st.nextInt();
resultset = query + " site:" + site;
for (int j = 0; j < n; j = j + 1) {
Thread.sleep(4000);
String address = "http://ajax.googleapis.com/ajax/services/search/web?v=1.0&start="+j+"&q=";
String charset = "UTF-8";
URL url = new URL(address + URLEncoder.encode(resultset, charset));
Reader reader = new InputStreamReader(url.openStream(), charset);
GoogleResults results = new Gson().fromJson(reader,
GoogleResults.class);
int total = results.getResponseData().getResults().size();
// Show title and URL of each results
for (int i = 0; i <= total - 1; i++) {
String Url = results.getResponseData().getResults().get(i)
.getUrl();
k = k+1;
System.out.println("URL: " +Url+ " " + k);
}
}
}
}
when i run it, i have trouble about result return of code.
My system return list url of website.. but it not stable.
Some picture:
my error
Have error: Exception in thread "main" java.lang.NullPointerException
at CrawData.main(CrawData.java:107)
help me...
Sorry my english is too bad.. :(

My guess is that on this line:
String Url = results.getResponseData().getResults().get(i)
.getUrl();
Either get(i) is returning null or getUrl() is returning null. You should add some error handling logic:
if (results.getResponseData().getResults().get(i) != null &&
results.getResponseData().getResults().get(i).getUrl() !=null) {
String Url = results.getResponseData().getResults().get(i)
.getUrl();
k = k+1;
System.out.println("URL: " +Url+ " " + k);
} else {
// Print some type of error here. Try to figure out why the result or the
// url is null
}