NextLine makes me sad

[Fred Dubrovskiy]

Hey =) I am a little bit stuck here =)

I have this file that I want to scan that contains some data. Such as

12-Jan-2012,815,847.5,849.5,804.55,658784
11-Jan-2012,799.5,812,818,796.5,634561

etc.


I need to scan the file and print it to console. But at first its ok but at the end I get an error

Exception in thread "main" java.util.NoSuchElementException: No line found
at java.util.Scanner.nextLine(Scanner.java:1516)
at readfile.readFile(readfile.java:25)
at Test.main(Test.java:9)

I think it is something to do with my usage of Scanner.nextLine method.... Could someone help me out? Here is my code...

import java.io.*;
import java.util.*;

public class readfile {
	// The class with all the methods to do with our initial file that contains the data
	private Scanner myScanner;
	private BufferedReader x;
	
	// A method to open the file
	public void openFile(){
		try{
			myScanner = new Scanner(new File("/Users/Apadani/Documents/workspace/CS1004 Practical 1/src/shares-long.txt"));
		}
		catch(Exception e){
			System.out.println("File Could Not Be Found");
		}
	}



public void readFile() {
	
	while(myScanner.hasNext()){
		String a = myScanner.nextLine();
		String b = myScanner.nextLine();
		String c = myScanner.nextLine();
		String d = myScanner.nextLine();
		
		System.out.printf("%s \n %s \n %s \n %s \n", a,b,c,d);
	
	}
	
}
	
public void closeFile() {
	myScanner.close();
}
	
}

And another question if I may =)

I need to save this data as a separate file which should be an HTML template. I have really no clue how to do that, or if it is even possible =)

It is my first post btw If those are really nooby questions please dont be too harsh on me

[Fred Dubrovskiy]

SOLVED

Posting the code here in case anyone will have the same problem in the future

import java.io.*;
import java.util.*;

public class readfile {
	// The class with all the methods to do with our initial file that contains the data
	private Scanner myScanner;
	private BufferedReader x;
	
	// A method to open the file
	public void openFile(){
		try{
			myScanner = new Scanner(new File("/Users/Apadani/Documents/workspace/CS1004 Practical 1/src/shares-long.txt"));
		}
		catch(Exception e){
			System.out.println("File Could Not Be Found");
		}
	}



public void readFile() {

	while(myScanner.hasNextLine()){
		String a = myScanner.nextLine();
	
		
		System.out.printf("%s \n", a);
	
	}
	
}
	
public void closeFile() {
	myScanner.close();
}
	
}

credit to ilyagetready

[Fred Dubrovskiy]

Another problem I face is how to get this from consol into another text document. Would appreciate any help. This is what I came up with so far.

import java.io.*;
import java.util.*;

public class readfile {
	// The class with all the methods to do with our initial file that contains the data
	private Scanner myScanner;
	
	// A method to open the file
	public void openFile(){
		try{
			myScanner = new Scanner(new File("/Users/Apadani/Documents/workspace/CS1004 Practical 1/src/shares-long.txt"));
		}
		catch(Exception e){
			System.out.println("File Could Not Be Found");
		}
	}



public void readFile() {
	// A loop to establish the end of file
	while(myScanner.hasNextLine()){
		String a = myScanner.nextLine();
	
		
		System.out.printf("%s \n", a);
	
	}
	
}
	
public void closeFile() {
	myScanner.close();
	
}

public void Test1() {
	
	
	try {
	      //create a buffered reader that connects to the console, we use it so we can read lines
	      BufferedReader MyBreader = new BufferedReader(new InputStreamReader(System.in));

	      //read a line from the console
	      String lineFromInput = MyBreader.readLine();

	      PrintStream out = new PrintStream(new FileOutputStream("/Users/Apadani/Desktop/test.txt"));
	  	System.setOut(out);

	      //output to the file a line
	      out.println(lineFromInput);

	      //close the file
	      out.close();
	   }
	      catch(IOException e1) {
	        System.out.println("Error during reading/writing");
	   }
}

}
	

[Kemal Sokolovic]

Another problem I face is how to get this from consol into another text document. Would appreciate any help. This is what I came up with so far.

And what exactly is the problem you are facing? You need to be more specific and TellTheDetails so we can help you.

The only thing that I see might be wrong with your code is that the path you are using to write to a file is not correct. There is a drive missing at the beginning, meaning that your other methods shouldn't work too.

Also make sure you follow the naming convention. Class names are written in camel case, starting with a capital letter; methods start with a lower letter as well as variables.

[Fred Dubrovskiy]

Thank you =) Will try and follow the naming conventions in the future =)

The pathways all should be correct - as I am working on a mac. The other method work just fine with those pathways.

What I am wanting to do is to create a java program to read data from a .txt file and create a web page presenting this information in a suitable format.

So far I have managed to open the file and present all the data to appear on the console. Now what I willing to do is to create a method to be able to put all those lines from the console and create a new .txt document with them. This is what I think should be responsible for this action - but it is not working =(

My next step would be writing a webpage template onto which I will hopefull to rewrite the data again.

public void Test1() {
	
	
	try {
	      //create a buffered reader that connects to the console, we use it so we can read lines
	      BufferedReader MyBreader = new BufferedReader(new InputStreamReader(System.in));

	      //read a line from the console
	      String lineFromInput = MyBreader.readLine();

	      PrintStream out = new PrintStream(new FileOutputStream("/Users/Apadani/Desktop/test.txt"));
	  	System.setOut(out);

	      //output to the file a line
	      out.println(lineFromInput);

	      //close the file
	      out.close();
	   }
	      catch(IOException e1) {
	        System.out.println("Error during reading/writing");
	   }

[Kemal Sokolovic]

My mistake, I thought it's a Windows path.

How about you check if an exception occurs and print the stack trace at that catch block. Then post it here.

[Fred Dubrovskiy]

It doesnt want to show at all and nothing gets printed out.Perhaps I should rephrase myself.

So far I have lines of such code in the console

25-Jan-2011,874,866.5,877.5,852.5,311686 
24-Jan-2011,849.5,869.5,873,849.5,470688 
21-Jan-2011,842.5,847,857,830.5,714835 
20-Jan-2011,855.5,839.5,858,839.5,593146 
19-Jan-2011,869,855,869,848.5,824173 
18-Jan-2011,880,868.5,898.5,865,867099 
17-Jan-2011,868.5,880.5,886.5,859.5,518778

I want to know how to make a method to scan this code and make a new .txt file out of it.

[Ivan Jozsef Balazs]

A sidenote: if you run the program with the standard output redirected into a file, then the System.out... stuff will go there.
I think this works with the Apple command line (is it maybe bash?) as well:

java -classpath myclasspath myoptions myprogram myarguments >file