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BufferedReader reads just one line in an multiple line file

I tried to archive that a multiline file will be read from an BufferedReader. But this BufferedReader reads just one line and exiting his while(). Before he can read this, another method of the same class should've been written in this file (not at the same time), mostly more than one line. The file contains different types of variables, such as int[], int, double[], String. At the end of one object, or nearly just the data that I've to collect that I can re-calculate the whole object, the ObjectOutputStream pastes "\n". I just write parsed Strings in this file.
In my case, it's a workaround for the ObjectInputStream, cause this stream throws an EOFException every time. For those who don't know the EOFException: it will be thrown if the reader reaches end of file while reading.
I tried to:
set the input string for the BufferedReader to another line
.close() the Reader and make it new
set while(1)
write other Datatypes, such as the whole Object
but all without any changes. The BufferedReader reads just one line and the ObjectInputStream throws EOFException.
LinkedList<SomeAnotherSelfMadeClass> list;
File file = new File(fullPath) // fullPath = absolute path to the file
FileInputStream fileInputStream;
BufferedReader bufferedReader;
public static LinkedList<SomeAnotherSelfMadeClass> readFile()
{
list = new LinkedList<SomeAnotherSelfMadeClass>();
fileInputStream = new FileInputStream(file); // could be FileReader
bufferedReader = new BufferedReader(fileInputStream);
String helper, anotherHelper;
while ((helper = bufferedReader.readLine()) != null)
{
while ((anotherHelper = scanner.hasNext()) != null)
// here's some code with scanner-things, it shouldn't be necessary to
// know. In fact the scanner help to gather the data from the file and
// create an object of SomeAnotherSelfMadeCLass and put it into the list
}
bufferedReader.close();
fileInputStream.close();
return list;
}
What can I do that I can read all lines of the file and re-calcuate my objects that are pasted in there?
I don't know either; it is better to work with the ObjectInputStream or with the BufferedReader? What can I do that the ObjectInputStream don't throws the EOFException (every time I worked with the ObjectInputStream I wrote the whole Object via ObjectOutputStream)?
P.S.: I don't have internet atm at home, so it could take a while that I'm able to answer.

Try with this structure of code..
BufferedReader objReader = null;
public static LinkedList<SomeAnotherSelfMadeClass> readFile()
{
list = new LinkedList<SomeAnotherSelfMadeClass>();
try {
objReader = new BufferedReader(new FileReader(fullPath));
while ((helper= objReader.readLine()) != null) {
...........
System.out.println(helper);//just for checking
while ((anotherHelper = scanner.hasNextLine()) != null){
.....
....
}
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (objReader != null)
objReader.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}

I'm a little idiot, you have to know.
The second while() had the condition (anotherHelper = scanner.next()) != null, not that what I stated before.
But I managed to get another outputs, even I tried this before (it seems that I'd misstyped at any point);
I set the first while() to true, test helper to break out of the while() and deleted the second while:
while(true)
{
helper = bufferedReader.readLine();
if (helper.equals(null))
break;
// making things with the scanner
}
It seems that the compiler had a problem with this double-while. And optimized it wrong; I think he made
while (((helper = bufferedReader.readLine() != null) && (helper = scanner.nextLine()) != null)
out of this peace of code. That would explain why it only run once and returns true if I test it with System.out.println(scanner.hasNext(); and System.out.println(scanner.hasNextLine(); BEFORE the second while, but in it he returns not even false.

How to read in integers from a file in Java

Okay so I wanted to read in the integers I have along with the strings in a file. So far I have this code and I keep getting an error. I have this in my text file: Grey:30
Black:40
I'm trying to read in the strings along with the integers because I want to set the integers as points worth for the string (color)
while (strike!=3){
Scanner name1 = new Scanner(System.in);
System.out.println("Enter A color");
String nameTaken = name1.next();
while(filechecker.hasNextLine()){
list.add(filechecker.nextLine());
}
String line =filechecker.nextLine();
String[] details = line.split(":");//checks for the integer next to the color
if((list.contains(nameTaken))&&(filechecker.hasNextInt())){
int points = Integer.parseInt(details[2]);
System.out.println("The Answer Exists!! You Got " +details[2]);

You don't indicate what error you're getting, but I can see from the following code, you're likely getting a NullPointerException or something similar.
Edit: Seems you're getting the NoSuchElementException because no lines remain to be read.
This block of code loops through your filechecker and reads all lines into a list, until no more lines remain. The line immediately following the while block attempts to read another line from it, which it won't find because you've read them all (it will return null). The line where you try to split will throw an exception because of this.
while(filechecker.hasNextLine()){
list.add(filechecker.nextLine());
}
String line =filechecker.nextLine(); // <-- this line is throwing it. Don't use it here, use your list or do your work in the while loop instead.
String[] details = line.split(":");//checks for the integer next to the color
Instead of operating on the filechecker after your while, loop, use your list. Or better yet, do all your work in the while loop instead.

It might be easier to use a HashMap to store your data:
HashMap<String, Integer> colorData = new HashMap<String, Integer>();
You can then use ObjectOutputStream and ObjectInputStream to write and read the file:
void write(String fileName) {
FileOutputStream fileOut = new FileOutputStream(fileName);
ObjectOutputStream out = new ObjectOutputStream(fileOut);
out.writeObject(colorData);
}
void read(String fileName) {
ObjectInputStream in = null;
try {
fileIn = new FileInputStream(fileName);
in = new ObjectInputStream(fileIn);
colorData = (HashMap<String, Integer>) in.readObject();
} catch (Exception e) {
e.printStackTrace();
}finally {
if(objectinputstream != null)
objectinputstream .close();
}
}

Read a single file with multiple BufferedReaders

I'm working on a program that needs to update a line that depends its value on the result of a line that goes read after. I thought that I could use two BufferedReaders in Java to position the reader on the line to update while the other one goes for the line that fixes the value (it can be an unknown number of lines ahead). The problem here is that I'm using two BufferedReaders on the same file and even if I think I'm doing right with the indexes the result in debug doesn't seem to be reliable.
Here's the code:
String outFinal
FileName=fileOut;
File fileDest=new File(outFinalFileName);
try {
fout = new BufferedWriter(
new OutputStreamWriter(
new FileOutputStream(fileDest)));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
FileReader inputFile=null;
try {
inputFile = new FileReader(inFileName);
} catch (FileNotFoundException e2) {
e2.printStackTrace();
}
BufferedReader fin = new BufferedReader(inputFile);
BufferedReader finChecker = new BufferedReader(inputFile); //Checks the file and matches record to change
String line="";
String lineC="";
int lineNumber=0;
String recordType="";
String statusCode="";
try {
while ((lineC = finChecker.readLine()) != null) {
lineNumber++;
if (lineNumber==1)
line=fin.readLine();
recordType=lineC.substring(0,3);//Gets current Record Type
if (recordType.equals("35")){
while(!line.equals(lineC)){
line=fin.readLine();
if (line==null)
break;
fout.write(line);
}
}else if (recordType.equals("32")){
statusCode=lineC.substring(4,7);
if(statusCode.equals("XX")){
updateRecordLine(line,fout);
}
}
}
returnVal=true;
} catch (IOException e) {
e.printStackTrace();
}
Thanks in advance.

Well, the BufferedReader only reads stuff, it doesn't have the ability to write data back out. So, what you would need is a BufferedReader to get stuff in, and a BufferedWriter that takes all the input from the BufferedReader, and outputs it to a temp file, with the corrected/appended data.
Then, when you're done (i.e. both BufferedReader and BufferedWriter streams are closed), you need to either discard the original file, or rename the temp file to the name of the original file.
You are basically copying the original file to a temp file, modifying the line in question in the temp file's output, and then copying/renaming the temp file over the original.

ok, i see some problem in your code exactly on these lines-->
recordType=lineC.substring(0,3);//Gets current Record Type
if (recordType.equals("35")){
if you see on the first line, you are getting the substring of recordType into recordType. Now recordType length is 3. If at all the recordType has only 2 characters, then substring throws arrayIndexOutOfBoundsException. So when no runtime exceptions, its length is 3 and on the next line you are calling the equals method that has a string with 2 characters.
Will this if block ever run ?

Java: How to read a text file

I want to read a text file containing space separated values. Values are integers.
How can I read it and put it in an array list?
Here is an example of contents of the text file:
1 62 4 55 5 6 77
I want to have it in an arraylist as [1, 62, 4, 55, 5, 6, 77]. How can I do it in Java?

You can use Files#readAllLines() to get all lines of a text file into a List<String>.
for (String line : Files.readAllLines(Paths.get("/path/to/file.txt"))) {
// ...
}
Tutorial: Basic I/O > File I/O > Reading, Writing and Creating text files
You can use String#split() to split a String in parts based on a regular expression.
for (String part : line.split("\\s+")) {
// ...
}
Tutorial: Numbers and Strings > Strings > Manipulating Characters in a String
You can use Integer#valueOf() to convert a String into an Integer.
Integer i = Integer.valueOf(part);
Tutorial: Numbers and Strings > Strings > Converting between Numbers and Strings
You can use List#add() to add an element to a List.
numbers.add(i);
Tutorial: Interfaces > The List Interface
So, in a nutshell (assuming that the file doesn't have empty lines nor trailing/leading whitespace).
List<Integer> numbers = new ArrayList<>();
for (String line : Files.readAllLines(Paths.get("/path/to/file.txt"))) {
for (String part : line.split("\\s+")) {
Integer i = Integer.valueOf(part);
numbers.add(i);
}
}
If you happen to be at Java 8 already, then you can even use Stream API for this, starting with Files#lines().
List<Integer> numbers = Files.lines(Paths.get("/path/to/test.txt"))
.map(line -> line.split("\\s+")).flatMap(Arrays::stream)
.map(Integer::valueOf)
.collect(Collectors.toList());
Tutorial: Processing data with Java 8 streams

Java 1.5 introduced the Scanner class for handling input from file and streams.
It is used for getting integers from a file and would look something like this:
List<Integer> integers = new ArrayList<Integer>();
Scanner fileScanner = new Scanner(new File("c:\\file.txt"));
while (fileScanner.hasNextInt()){
integers.add(fileScanner.nextInt());
}
Check the API though. There are many more options for dealing with different types of input sources, differing delimiters, and differing data types.

This example code shows you how to read file in Java.
import java.io.*;
/**
* This example code shows you how to read file in Java
*
* IN MY CASE RAILWAY IS MY TEXT FILE WHICH I WANT TO DISPLAY YOU CHANGE WITH YOUR OWN
*/
public class ReadFileExample
{
public static void main(String[] args)
{
System.out.println("Reading File from Java code");
//Name of the file
String fileName="RAILWAY.txt";
try{
//Create object of FileReader
FileReader inputFile = new FileReader(fileName);
//Instantiate the BufferedReader Class
BufferedReader bufferReader = new BufferedReader(inputFile);
//Variable to hold the one line data
String line;
// Read file line by line and print on the console
while ((line = bufferReader.readLine()) != null) {
System.out.println(line);
}
//Close the buffer reader
bufferReader.close();
}catch(Exception e){
System.out.println("Error while reading file line by line:" + e.getMessage());
}
}
}

Look at this example, and try to do your own:
import java.io.*;
public class ReadFile {
public static void main(String[] args){
String string = "";
String file = "textFile.txt";
// Reading
try{
InputStream ips = new FileInputStream(file);
InputStreamReader ipsr = new InputStreamReader(ips);
BufferedReader br = new BufferedReader(ipsr);
String line;
while ((line = br.readLine()) != null){
System.out.println(line);
string += line + "\n";
}
br.close();
}
catch (Exception e){
System.out.println(e.toString());
}
// Writing
try {
FileWriter fw = new FileWriter (file);
BufferedWriter bw = new BufferedWriter (fw);
PrintWriter fileOut = new PrintWriter (bw);
fileOut.println (string+"\n test of read and write !!");
fileOut.close();
System.out.println("the file " + file + " is created!");
}
catch (Exception e){
System.out.println(e.toString());
}
}
}

Just for fun, here's what I'd probably do in a real project, where I'm already using all my favourite libraries (in this case Guava, formerly known as Google Collections).
String text = Files.toString(new File("textfile.txt"), Charsets.UTF_8);
List<Integer> list = Lists.newArrayList();
for (String s : text.split("\\s")) {
list.add(Integer.valueOf(s));
}
Benefit: Not much own code to maintain (contrast with e.g. this). Edit: Although it is worth noting that in this case tschaible's Scanner solution doesn't have any more code!
Drawback: you obviously may not want to add new library dependencies just for this. (Then again, you'd be silly not to make use of Guava in your projects. ;-)

Use Apache Commons (IO and Lang) for simple/common things like this.
Imports:
import org.apache.commons.io.FileUtils;
import org.apache.commons.lang3.ArrayUtils;
Code:
String contents = FileUtils.readFileToString(new File("path/to/your/file.txt"));
String[] array = ArrayUtils.toArray(contents.split(" "));
Done.

Using Java 7 to read files with NIO.2
Import these packages:
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
This is the process to read a file:
Path file = Paths.get("C:\\Java\\file.txt");
if(Files.exists(file) && Files.isReadable(file)) {
try {
// File reader
BufferedReader reader = Files.newBufferedReader(file, Charset.defaultCharset());
String line;
// read each line
while((line = reader.readLine()) != null) {
System.out.println(line);
// tokenize each number
StringTokenizer tokenizer = new StringTokenizer(line, " ");
while (tokenizer.hasMoreElements()) {
// parse each integer in file
int element = Integer.parseInt(tokenizer.nextToken());
}
}
reader.close();
} catch (Exception e) {
e.printStackTrace();
}
}
To read all lines of a file at once:
Path file = Paths.get("C:\\Java\\file.txt");
List<String> lines = Files.readAllLines(file, StandardCharsets.UTF_8);

All the answers so far given involve reading the file line by line, taking the line in as a String, and then processing the String.
There is no question that this is the easiest approach to understand, and if the file is fairly short (say, tens of thousands of lines), it'll also be acceptable in terms of efficiency. But if the file is long, it's a very inefficient way to do it, for two reasons:
Every character gets processed twice, once in constructing the String, and once in processing it.
The garbage collector will not be your friend if there are lots of lines in the file. You're constructing a new String for each line, and then throwing it away when you move to the next line. The garbage collector will eventually have to dispose of all these String objects that you don't want any more. Someone's got to clean up after you.
If you care about speed, you are much better off reading a block of data and then processing it byte by byte rather than line by line. Every time you come to the end of a number, you add it to the List you're building.
It will come out something like this:
private List<Integer> readIntegers(File file) throws IOException {
List<Integer> result = new ArrayList<>();
RandomAccessFile raf = new RandomAccessFile(file, "r");
byte buf[] = new byte[16 * 1024];
final FileChannel ch = raf.getChannel();
int fileLength = (int) ch.size();
final MappedByteBuffer mb = ch.map(FileChannel.MapMode.READ_ONLY, 0,
fileLength);
int acc = 0;
while (mb.hasRemaining()) {
int len = Math.min(mb.remaining(), buf.length);
mb.get(buf, 0, len);
for (int i = 0; i < len; i++)
if ((buf[i] >= 48) && (buf[i] <= 57))
acc = acc * 10 + buf[i] - 48;
else {
result.add(acc);
acc = 0;
}
}
ch.close();
raf.close();
return result;
}
The code above assumes that this is ASCII (though it could be easily tweaked for other encodings), and that anything that isn't a digit (in particular, a space or a newline) represents a boundary between digits. It also assumes that the file ends with a non-digit (in practice, that the last line ends with a newline), though, again, it could be tweaked to deal with the case where it doesn't.
It's much, much faster than any of the String-based approaches also given as answers to this question. There is a detailed investigation of a very similar issue in this question. You'll see there that there's the possibility of improving it still further if you want to go down the multi-threaded line.

read the file and then do whatever you want
java8
Files.lines(Paths.get("c://lines.txt")).collect(Collectors.toList());

How Can I Reset The File Pointer to the Beginning of the File in Java?

I am writing a program in Java that requires me to compare the data in 2 files. I have to check each line from file 1 against each line of file 2 and if I find a match write them to a third file. After I read to the end of file 2, how do I reset the pointer to the beginning of the file?
public class FiFo {
public static void main(String[] args)
{
FileReader file1=new FileReader("d:\\testfiles\\FILE1.txt");
FileReader file2=new FileReader("d:\\testfiles\\FILE2.txt");
try{
String s1,s2;
while((s1=file1.data.readLine())!=null){
System.out.println("s1: "+s1);
while((s2=file2.data.readLine())!=null){
System.out.println("s2: "+s2);
}
}
file1.closeFile();
file2.closeFile();
}catch (IOException e) {
e.printStackTrace();
}
}
}
class FileReader {
BufferedReader data;
DataInputStream in;
public FileReader(String fileName)
{
try{
FileInputStream fstream = new FileInputStream(fileName);
data = new BufferedReader(new InputStreamReader(fstream));
}
catch (IOException e) {
e.printStackTrace();
}
}
public void closeFile()
{
try{
in.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
}

I believe RandomAccessFile is what you need. It contains: RandomAccessFile#seek and RandomAccessFile#getFilePointer.
rewind() is seek(0)

I think the best thing to do would be to put each line from file 1 into a HashMap; then you could check each line of file 2 for membership in your HashMap rather than reading through the entire file once for each line of file 1.
But to answer your question of how to go back to the beginning of the file, the easiest thing to do is to open another InputStream/Reader.

Obviously you could just close and reopen the file like this:
while((s1=file1.data.readLine())!=null){
System.out.println("s1: "+s1);
FileReader file2=new FileReader("d:\\testfiles\\FILE2.txt");
while((s2=file2.data.readLine())!=null){
System.out.println("s2: "+s2);
//compare s1 and s2;
}
file2.closeFile()
}
But you really don't want to do it that way, since this algorithm's running time is O(n2). if there were 1000 lines in file A, and 10000 lines in file B, your inner loop would run 1,000,000 times.
What you should do is read each line and store it in a collection that allows quick checks to see if an item is already contained(probably a HashSet).
If you only need to check to see that every line in file 2 is in file 1, then you just add each line in file one to a HashSet, and then check to see that every line in file 2 is in that set.
If you need to do a cross comparison where you find every string that's in one but not the other, then you'll need two hash sets, one for each file. (Although there's a trick you could do to use just one)
If the files are so large that you don't have enough memory, then your original n2 method would never have worked anyway.

well, Gennady S. answer is what I would use to solve your problem.
I am writing a program in Java that requires me to compare the data in 2 files
however, I would rather not code this up again.. I would rather use something like http://code.google.com/p/java-diff-utils/

As others have suggested, you should consider other approaches to the problem. For the specific question of returning to a previous point in a file, java.io.FileReader would appear to inherit mark() and reset() methods that address this goal. Unfortunately, markSupported() returns false.
Alternatively, BufferedReader does support mark(). The program below prints true, illustrating the effect.
package cli;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
public class FileReaderTest {
public static void main(String[] args) {
try {
BufferedReader in = new BufferedReader(new InputStreamReader(
new FileInputStream("src/cli/FileReaderTest.java")));
in.mark(1);
int i1 = in.read(); in.read(); in.read();
in.reset();
int i2 = in.read();
System.out.println(i1 == i2);
} catch (IOException e) {
e.printStackTrace(System.err);
}
}
}

As noted, there are better algorithms - investigate these
aside:
FileReader doesn't implement mark and reset, so trashgod's comments are inaccurate.
You'd either have to implement a version of this (using RandomAccessFile or what not) or wrap in a BufferedReader. However, the latter will load the whole thing in memory if you mark it

Just a quick Question. can't you keep one object pointed at the start of the file and traverse through the file with another object? Then when you get to the end just point it to the object at the beginning of the file(stream). I believe C++ has such mechanisms with file I/O ( or is it stream I/O)

I believe that you could just re-initialize the file 2 file reader and that should reset it.

If you can clearly indentify the dimension of your file you can use mark(int readAheadLimit) and reset() from the class BufferedReader.
The method mark(int readAhedLimit) add a marker to the current position of your BufferedReader and you can go back to the marker using reset().
Using them you have to be careful to the number of characters to read until the reset(), you have to specify them as the argument of the function mark(int readAhedLimit).
Assuming a limit of 100 characters your code should look like:
class MyFileReader {
BufferedReader data;
int maxNumberOfCharacters = 100;
public MyFileReader(String fileName)
{
try{
FileInputStream fstream = new FileInputStream(fileName);
data = new BufferedReader(new InputStreamReader(fstream));
//mark the current position, in this case the beginning of the file
data.mark(maxNumberOfCharacters);
}
catch (IOException e) {
e.printStackTrace();
}
}
public void resetFile(){
data.reset();
}
public void closeFile()
{
try{
in.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
}

If you just want to reset the file pointer to the top of the file, reinitialize your buffer reader. I assume that you are also using the try and catch block to check for end of the file.
`//To read from a file.
BufferedReader read_data_file = new BufferedReader(new FileReader("Datafile.dat"));'
Let's say this is how you have your buffer reader defined. Now, this is how you can check for end of file=null.
boolean has_data= true;
while(has_data)
{
try
{
record = read_data_file.readLine();
delimit = new StringTokenizer(record, ",");
//Reading the input in STRING format.
cus_ID = delimit.nextToken();
cus_name = delimit.nextToken();'
//And keep grabbing the data and save it in appropriate fields.
}
catch (NullPointerException e)
{
System.out.println("\nEnd of Data File... Total "+ num_of_records
+ " records were printed. \n \n");
has_data = false; //To exit the loop.
/*
------> This point is the trouble maker. Your file pointer is pointing at the end of the line.
-->If you want to again read all the data FROM THE TOP WITHOUT RECOMPILING:
Do this--> Reset the buffer reader to the top of the file.
*/
read_data_file = new BufferedReader(new FileReader(new File("datafile.dat")));
}
By reinitializing the buffer reader you will reset the file reader mark/pointer to the top of the file and you won't have to recompile the file to set the file reader marker/pointer to beginning/top of the file.
You need to reinitialize the buffer reader only if you don't want to recompile and pull off the same stunt in the same run. But if you wish to just run loop one time then you don't have to all this, by simply recompiling the file, the file reader marker will be set to the top/beginning of the file.