[litterbug_kid]

I'm testing out some code to read from a text file. Everything else seems to compile fine but nextChar is not being recognised.

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class Example4_4 {

	private void doInputs(final String fileName) {

		final FileInput in = new FileInput(fileName);
		Scanner in2 = in.getFileInputScannerObject();
		
		final int n = in2.nextInt();
		System.out.println("Integer was: " + n);
		final long l = in2.nextLong();
		System.out.println("Long was: " + l);
		final float f = in2.nextFloat();
		System.out.println("Float was: " + f);
		final double d = in2.nextDouble();
		System.out.println("Double was: " + d);
		
		final char c = in2.nextChar();
		System.out.println("Char was: " + c);
		
		final String s = in2.nextLine();
		System.out.println("Line was: " + n);
		in2.close();
	}
	
	public static void main(final String[] args) {
		Example4_4 object = new Example4_4();
		object.doInputs("test_data.txt");
	}
}

error message:
cannot find symbol - method nextChar()

This post has been edited by litterbug_kid: 28 January 2009 - 06:46 AM

[mostyfriedman]

there's no nextChar() method in the Scanner class, if you wanna read a char then
char c = sc.nextLine().charAt(0);

This post has been edited by mostyfriedman: 28 January 2009 - 05:28 AM

[litterbug_kid]

It's still giving me the same error

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class Example4_4b {

	private void doInputs(final String fileName) {
		Scanner sc = new Scanner(System.in);
		
		final int n = sc.nextInt();
		System.out.println("Integer was: " + n);
		final long l = sc.nextLong();
		System.out.println("Long was: " + l);
		final float f = sc.nextFloat();
		System.out.println("Float was: " + f);
		final double d = sc.nextDouble();
		System.out.println("Double was: " + d);
		
		final char c = sc.nextChar().charAt(0);
		System.out.println("Char was: " + c);
		
		
		final String s = sc.nextLine();
		System.out.println("Line was: " + n);
		sc.close();
	}
	
	public static void main(final String[] args) {
		Example4_4b object = new Example4_4b();
		object.doInputs("test_data.txt");
	}
}

This post has been edited by litterbug_kid: 28 January 2009 - 05:39 AM

[mostyfriedman]

final char c = sc.nextChar().charAt(0);;

you got 2 semicolons there, remove one

what error are you getting now?

[litterbug_kid]

mostyfriedman, on 28 Jan, 2009 - 12:40 PM, said:

final char c = sc.nextChar().charAt(0);;

you got 2 semicolons there, remove one

what error are you getting now?

I saw that and edited my post, and re-compiled. Didn't make a difference
Same error
"cannot find symbol - method nextChar()"

This post has been edited by litterbug_kid: 28 January 2009 - 05:41 AM

[mostyfriedman]

post the error you are receiving

[litterbug_kid]

mostyfriedman, on 28 Jan, 2009 - 12:41 PM, said:

post the error you are receiving

Just did, edited my post above yours

[mostyfriedman]

then what's the problem now?

[litterbug_kid]

mostyfriedman, on 28 Jan, 2009 - 12:43 PM, said:

then what's the problem now?

It's still not recognising method nextChar

[mostyfriedman]

that's because it doesnt exit in the Scanner class, remove nextChar() from your code if its still there..if you want to input a character then
char c = sc.nextLine().charAt(0);

[litterbug_kid]

mostyfriedman, on 28 Jan, 2009 - 12:47 PM, said:

that's because it doesnt exit in the Scanner class, remove nextChar() from your code if its still there..if you want to input a character then
char c = sc.nextLine().charAt(0);

Oh! whoops.. sorry xD. My eyes didn't register you changing it to nextLine.
Thankyouu.. it works now

[mostyfriedman]

no problem

[litterbug_kid]

I'm having trouble running this code:

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.io.*;

class question1_11 {

	public void showFile() {
		String filename = getFileName();
		displayFileContent(filename);
	}
	
	private String getFileName() {
		Scanner sc = new Scanner(System.in);
		//Input sc = new Input();
		System.out.print("Enter filename: ");
		String filename = sc.nextLine();
		return filename;
	}
	
	private void displayFileContent(String filename) {
		Scanner sc = new Scanner(System.in);
					  
		int counter = 0;

		while (sc.hasNextLine()) {
			char s = sc.nextLine().charAt(counter);
			System.out.println(s + " ");
			counter++;
		}

		sc.close();
	}

	public static void main(String[] args) {
		new question1_11().showFile();
		
	}
	
}

error message:
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 0
at java.lang.String.charAt(String.java:687)
at question1_11.displayFileContent(Main.java:27)
at question1_11.showFile(Main.java:10)
at question1_11.main(Main.java:36)
Java Result: 1
BUILD SUCCESSFUL (total time: 16 seconds)

[BigAnt]

What you are doing is reading in each line of the file and taking the appropriate character corresponding to the counter flag.

ie. First line you get first character, second line the second character, and so on. So when you evenetually have 500 or so lines, if this lines is less than that characters you thus get the index out of bounds exception.

What do you want it to do?

Print each line, certain characters? Give explanation as the output you want.

This post has been edited by BigAnt: 28 January 2009 - 08:05 AM

[litterbug_kid]

BigAnt, on 28 Jan, 2009 - 03:05 PM, said:

What you are doing is reading in each line of the file and taking the appropriate character corresponding to the counter flag.

ie. First line you get first character, second line the second character, and so on. So when you evenetually have 500 or so lines, if this lines is less than that characters you thus get the index out of bounds exception.

What do you want it to do?

Print each line, certain characters? Give explanation as the output you want.

I'm trying to read in each character of the file seperately and output them

This post has been edited by litterbug_kid: 28 January 2009 - 08:26 AM