Learning Java: Part 15: Reading Text from Files

Subscribed! <3

As a tip in general it's a bad idea to add strings in a loop like this. But since here we know how big this file is and we know the file won't be expanded in the future it's no bid deal.

If this file was for instance inventory for a company or any file you'd expect to grow over time you should use the StringBuilder class for the string instead. The difference is StringBuilder will only use one string for the entire file whereas here we would write each line in the file as its own string.

the code differs like this:
StringBuilder s = new StringBuilder();

while (line!=null){
s.append(line+"\n");
line = reader.readLine();

}

thank you thank you thank you out of all the text read programs I wrote and tutorial for that sort of program yours is the only one that worked :D

there is no error coming during coding but program is not running, gives error at the time of running

please solve a problem

had alot of problems with those filereaders. first time I understand everything. great tutorial! thanks!

sorry i don't understand when you using " text += line;" can anyone explain this to me?

thanks for the vids I was so stuck on this.

How do i read a 2d array from a text file?

Liked for the help then disliked for League

Two questions:
1) How can I print 2 lines; so if I have hello in the first line and world in the second line how can I make it "Hello
World"

2) How can I make the path the path where the jar is located, because I need to be distributing the program so the path will change for all users.

very helpful and very well spoken. great job look forward to watching your videos in the future!

What happens with "throws Exception"?

great, can you please make a video where we can match if the two files have common data in them?
thanks for the great vedio

Very clear! Thanks a lot.

For the Lazy people:
FileReader file = new FileReader("C:/Users/ibrahim/Documents/NetBeansProjects/Test4_1/submit.txt");
BufferedReader reader = new BufferedReader(file);
String text = "";
String line = reader.readLine();
while (line != null) {
text += line;
line = reader.readLine();
}
System.out.println(text);

hey i want to know how can i search for a key word, such as a barcode

for instance my textfile has the code "12345678" but their will be mutliple barcodes withing this file along with a product discription and price

You actually explained this better than my uni lecturer.
You kept it concise, didn't stumble with your words and broke everything down simply without overloading it with technical bollocks.
Props to you sir.

How to save and open a file in your system? Thank you.

Wow someone who finally can do a simple example after hours of searching. You sir, earned a subscriber.

how to read the file if we have more than one line..??
please help me.

can you use filereader to input string text files like scanner?

Do you know how to do
if I want to read string by string like function fsacnf in C
thank u (I'm beginner java)

thank you that was very helpfull!

how come you don't have to close the file at the end?

can you read multiple text files?

do you know how to ask user to input something and then write it into the file ???

If you run into a problem searching for the file with eclipse you might wanna call it readme.txt.txt. Atleast that worked for me.

Thank you very much Brandon and I really proud of you.
I sent you a friendship request on Facebook, hope you will accept it.
Regards

is Readline method read only a line, and is that why we had to loop readLine method, if so how does readLine method know it has to go to next line in the file for rest of the text ?

Thank so much!! Complete Java newbie over here. Glad I found this bc I had no idea how to get started :)

One question, how can we get to a new line if the text is in another line in the FILE?

Thank you for the upload I was successfully able to read and open a file of mine. I had one question. When I put my txt file in the same package of my program it does not read it. Only way I can access it is if I specify path. Is there something i need to do to allow my program to pick up the file (read it) from within my package?

im doing a coputer project on banking n i thought using file would be most useful as i would be able to input information n take out info n alter it according to he user's wishas in deposit /withdraw cash,bt im only in 10th grade so im gonna have to learn how to use file .i think im making gr8 progress with ur vids!!

great video

Still can't believe java requires this many lines of code to do something so common, but it does

The While loop has an error that makes the BufferedReader actually iterate through each line 2 times before doing anything with the String values. By calling "BufferedReader.readLine() != null" you are effectively skipping 1 line before the important processes are finished.

Superb

What if my text file content 3rows and 3colmns and I want to read only the 2nd column ?
1 4 6
2 9 5
7 8 2

I want to read only ( 4 9 8)
Then how could I proceed?

thank you it helps my homework

how can i use delay function to read the text file letter by letter

Does anybody have problems with reader. The problem coming in the console is: Exception in thread "main" java.lang.Error: Unresolved compilation problems:
reader cannot be resolved
reader cannot be resolved

at fileNames.main(fileNames.java:10)

how to display data in another window like in jframe?

System.out.println(text);
reader.close();
maybe you should that

How do I want the program to write on the next line of the text file?

thanks a lot for the video. it was really helpful!!

any way to format the text so it spaces to a new line instead of run on sentence?

Hi Brandon. Somehow I get the following error: "Could not find or load main class ReadingTextFromFiles". I'm doing exactly the same as you in the vid. Any suggestions how to fix this and why I get this error?

Sir, may you please do a tutorial on how to read from file recursively in java?

Thank you for zooming in!!!!!