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How to get text from a TextFile and putting it to a Table

I am trying to put text from a text file to a table I want it to display on the table when pressing a button. It does not display any errors it just does not work. Can someone please explain why and how to make it work. The text is divided with ;
private void jButton4ActionPerformed(java.awt.event.ActionEvent evt)
{
try {
BufferedReader br = new BufferedReader(new
FileReader("zam.txt"));
String r;
int v =0;
do{
r = br.readLine();
if(r!=null){
v++;
}
}while(r!=null);
Object[] row = new String[v];
do{
r = br.readLine();
if(r!=null){
for (int i = 0; i < v; i++) {
int ix = r.indexOf(";");
row[i] = r.substring(0, ix);
r = r.substring(ix+1);
int zn = r.indexOf(";");
row[i] += r.substring(0, zn);
r = r.substring(zn+1);
int xn = r.indexOf(";");
row[i] += r.substring(0, xn);
r = r.substring(xn+1);
int an = r.indexOf(";");
row[i] += r.substring(0, an);
table.addRow(row);
}
}
}while(r!=null);
br.close();
} catch (IOException e) {
}
}

You should shorten this.
private void jButton4ActionPerformed(java.awt.event.ActionEvent evt)
{
try {
BufferedReader br = new BufferedReader(new
FileReader("zam.txt"));
String r;
do{
r = br.readLine();
if(r!=null){
String [] sline=r.split(";");
table.addRow(sline);
}
}while(r!=null);
br.close();
} catch (IOException e) {
}
}
Reason: you read the file 2 times but without resetting the stream. Why?
Then you counted the number of lines and took this number as number of columns, why?

You count the number of lines in the file
do{
r = br.readLine();
if(r!=null){
v++;
}
}while(r!=null);
After that you try to read from the file, after the EOF has already been reached
do{
r = br.readLine();
if(r!=null){
[...]
}
}while(r!=null);
r = br.readLine(); will return null, since the EOF has been reached, and skip over the loop
To fix this, you can either reopen the file
//counting code
br.close();
br = new BufferedReader([...]);
//reading code
Or you can add the lines to a List instead, and use that
BufferedReader br = new BufferedReader([...]);
List<String> lines = new ArrayList<String>();
for(String line = br.readLine(); line != null; line = br.readLine())
lines.add(line);
String[] row = lines.toArray(new String[0]);
If you're just adding the values to a table, it may be easier to not store the file at all
BufferedReader br = new BufferedReader([...]);
for(String line = br.readLine(); line != null; line = br.readLine())
table.addRow(line.split(";"));

InputStream reading file and counting lines/words

I'm working on a project and I'm trying to count
1) The number of words.
2) The number of lines in a text file.
My problem is that I can't figure out how to detect when the file goes to the next line so I can increment lines correctly. Basically if next is not a space increment words and if next is a new line, increment lines. How would I do this? Thanks!
public static void readFile(Scanner f) {
int words = 0;
int lines = 0;
while (f.hasNext()) {
if (f.next().equals("\n")) {
lines++;
} else if (!(f.next().equals(" "))) {
words++;
}
}
System.out.println("Total number of words: " + words);
System.out.println("Total number of lines: " + lines);
}

Try this:
public static void readFile(Scanner f) {
int words = 0;
int lines = 0;
while (f.hasNextLine()) {
String line = f.nextLine();
lines++;
for (String token : line.split("\\s+")) {
if (!token.isEmpty()) {
words++;
}
}
}
System.out.println("Total number of words: " + words);
System.out.println("Total number of lines: " + lines);
}

Do you have to use InputStream? (Yes) It is better to use a BufferedReader with an InputStreamReader passed in so you can read the file line by line and increment while doing so.
numLines = 0;
try (BufferedReader br = new BufferedReader(new InputStreamReader(inputStream))) {
String line;
while ((line = br.readLine()) != null)
{
numLines++;
// process the line.
}
}
Then to count the words just split the string using a regular expression that finds whitespaces. myStringArray = MyString.Split(MyRegexPattern); will then return a String[] of all the words. Then all you do is numWords += myStringArray.length();

You can use an InputStreamReader to create a bufferedreader which can read a file line by line:
int amountOfLines = 0;
try {BufferedReader br = new BufferedReader(new InputStreamReader(inputStream))} catch (Exception e) {e.printStackTrace();}
String line;
while ((line = br.readLine()) != null{
numLines++;
// process the line.
}
You can then use the split(String) method to separate every part

Try following:
public static void readFile(Scanner f) {
int words = 0;
int lines = 0;
while (f.hasNextLine()) {
String line = f.nextLine();
String[] arr = line.split("\\s");
words += arr.length;
lines++;
}
System.out.println("Total number of words: " + words);
System.out.println("Total number of lines: " + lines);
}

combine two methods in Java together in this Java code

I want combine the two methods Just some error in my document parser, frequencyCounter and parseFiles thsi code.
I want all of frequencyCounter should be a function that should be executed from within parseFiles, and relevant information don't worry about the file's content should be passed to doSomething so that it knows what to print.
Right now I'm just keep messing up on how to put these two methods together, please give some advices
this is my main class:
public class Yolo {
public static void frodo() throws Exception {
int n; // number of keywords
Scanner sc = new Scanner(System.in);
System.out.println("number of keywords : ");
n = sc.nextInt();
for (int j = 0; j <= n; j++) {
Scanner scan = new Scanner(System.in);
System.out.println("give the testword : ");
String testWord = scan.next();
System.out.println(testWord);
File document = new File("path//to//doc1.txt");
boolean check = true;
try {
FileInputStream fstream = new FileInputStream(document);
BufferedReader br = new BufferedReader(new InputStreamReader(fstream));
String strLine;
strLine = br.readLine();
// Read File Line By Line
int count = 0;
while ((strLine = br.readLine()) != null) {
// check to see whether testWord occurs at least once in the
// line of text
check = strLine.toLowerCase().contains(testWord.toLowerCase());
if (check) {
// get the line
String[] lineWords = strLine.split("\\s+");
// System.out.println(strLine);
count++;
}
}
System.out.println(testWord + "frequency: " + count);
br.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}

The code below gives you this output:
Professor frequency: 54
engineering frequency: 188
data frequency: 2
mining frequency: 2
research frequency: 9
Though this is only for doc1, you've to add a loop to iterate on all the 5 documents.
public class yolo {
public static void frodo() throws Exception {
String[] keywords = { "Professor" , "engineering" , "data" , "mining" , "research"};
for(int i=0; i< keywords.length; i++){
String testWord = keywords[i];
File document = new File("path//to//doc1.txt");
boolean check = true;
try {
FileInputStream fstream = new FileInputStream(document);
BufferedReader br = new BufferedReader(new InputStreamReader(fstream));
String strLine;
strLine = br.readLine();
// Read File Line By Line
int count = 0;
while ((strLine = br.readLine()) != null) {
// check to see whether testWord occurs at least once in the
// line of text
check = strLine.toLowerCase().contains(testWord.toLowerCase());
if (check) {
// get the line
String[] lineWords = strLine.split("\\s+");
count++;
}
}
System.out.println(testWord + "frequency: " + count);
br.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
hope this helps!

Replace letters with *

Making a hangman style of game
I have the random word now. How do I replace the letters of the word with an asterix * so that when the program starts the word is shown as *.
I assume that when someone inputs a letter for the hangman game you get the index of that character in the word and then replace the corresponding *.
public class JavaApplication10 {
public static String[] wordArray = new String[1];
public static String file_dir = "Animals.txt";
public static String selectedWord = "";
public static char[] wordCharacter = new char[1];
Scanner sc = new Scanner(System.in);
public static void main(String[] args) throws IOException {
wordArray = get_word(file_dir);
selectedWord = select_word(wordArray);
System.out.println(selectedWord);
}
public static String[] get_word(String file_dir) throws IOException {
FileReader fileReader = new FileReader(file_dir);
BufferedReader bufferedReader = new BufferedReader(fileReader);
List<String> lines = new ArrayList<String>();
String line = null;
while ((line = bufferedReader.readLine()) != null) {
lines.add(line);
}
bufferedReader.close();
return lines.toArray(new String[lines.size()]);
}
public static String select_word(String[] wordArray) {
Random rand = new Random();
int lines = Math.abs(rand.nextInt(wordArray.length)- 1);
return wordArray[lines];
}
}

If you know how many lines are there you could use Random method in java with a specific range to pick out a line at random.
Then you could read the file line-by-line till you reach that random line and print it.
// Open the file
FileInputStream fstream = new FileInputStream("testfile.txt");
BufferedReader br = new BufferedReader(new InputStreamReader(fstream));
String strLine;
int counter=0;
//While-loop -> Read File Line By Line till the end of file
//And will also terminate when the required line is printed
while ((strLine = br.readLine()) != null && counter!=randomValue){
counter++;
//You need to set randomValue using the Random method as suggested
if(counter==randomValue)
// Print the content on the console
System.out.println (strLine+"\n");
}
//Close the input stream
br.close();

Assuming Java 8:
// Loading ...
Random R = new Random(System.currentTimeMillis());
List<String> animals = Files.readAllLines(Paths.get(path));
// ...
// When using
String randomAnimal = animals.get(R.nextInt(animals.size()));

Answer of your first question :
First you have to get the total number of lines
Then you have to generate a random number between 1 and that total number.
Finally, get the required word
try {
InputStream is = new BufferedInputStream(new FileInputStream("D:\\test.txt"));
byte[] c = new byte[1024];
int count = 0;
int readChars = 0;
boolean empty = true;
while ((readChars = is.read(c)) != -1) {
empty = false;
for (int i = 0; i < readChars; ++i) {
if (c[i] == '\n') {
++count;
}
}
}
int noOfLines = count+1;
System.out.println(noOfLines);
Random random = new Random();
int randomInt = random.nextInt(noOfLines);
FileReader fr = new FileReader("D:\\test.txt");
BufferedReader bufferedReader =
new BufferedReader(fr);
String line = null;
int counter =1;
while((line = bufferedReader.readLine()) != null) {
if(counter == randomInt)
{
System.out.println(line); // This the word you want
}
counter++;
}
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
finally {
//is.close();
}

To print the given rows of string into columns

I have *.txt file with first row as name,address,mail id and second line with the values. I have to print this into two columns,the first one with the headings and second with the value using Java. how do I do this?
public class ReadFile1 {
public static void main(String[] args) {
BufferedReader br=null;
String sCurrentLine = null;
String delimiter = ",";
String[] filetags;
try {
br = new BufferedReader(new FileReader("path\\Read.txt"));
sCurrentLine = br.readLine();
StringBuffer result = new StringBuffer();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
String line = null;
try {
line = br.readLine();
} catch (IOException e) {
e.printStackTrace();
}
filetags = line.split(delimiter);
for(int i = 0;i < line.length(); i++)
{
System.out.println("****" +sCurrentLine);
String[] s = line.split(",");
for(int j = i-1; j<line.length();j++)
{
System.out.println("##############"+Arrays.toString(s));
}
}
}
}
This is what I tried. Ex: I have a file say,
line1) name,email,mobile and second
line2) john,j#abc.com,9876
line3) max,max#xyz.com,1234
Now, I need to print:
name john
email john#abc.com
moblie 9876
name max
email max#xyz.com
mobile 1234

Below is one way you may be able to get what you want, It is similar to how you have attempted but slightly more refined.
The File:
name,email,mobile and second
john,j#abc.com,9876
max,max#xyz.com,1234
The code:
//File is on my Desktop
Path myFile = Paths.get(System.getProperty("user.home")).resolve("Desktop").resolve("tester.txt");
//Try-With-Resources so we autoclose the reader after try block
try(BufferedReader reader = new BufferedReader(new FileReader(myFile.toFile()))){
String[] headings = reader.readLine().split(",");//Reads First line and gets headings
String line;
while((line = reader.readLine()) != null){//While there are more lines
String[] values = line.split(","); //Get the values
for(int i = 0; i < values.length; i++){//For each value
System.out.println(headings[i] + ": " + values[i]);//Print with a heading
}
}
} catch (IOException io) {
io.printStackTrace();
}
Good Luck!

Something like this should do the trick.
Read the file and store each line in a list.
Iterate through the list of lines
If it is safe to assume the first line will always be the title line, take the input and store it in a collection.
For the rest of the lines, split on the comma and use the index of the splitter array to refer to the title column.
List <String> lines = new ArrayList<String>();
Scanner scanner = new Scanner(new File("FileName.txt"));
while(scanner.hasNextLine()){
String line = scanner.nextLine();
lines.add(line);
}
scanner.close();
int lineNo = 0;
List <String> title = new ArrayList<String>();
for(String line : lines){
if(lineNo == 0){
String [] titles = line.split(",");
for(String t : titles){
title.add(t);
}
lineNo++;
}
else{
String input = line.split(",");
for(int i = 0; i<input.length; i++){
System.out.println(title.get(i) + ": " + input[i]);
}
lineNo++;
}
}