titaniumdecoy

I believe JTextField's getText() function is what you're looking for.

Whatever works. file.in is the name of the file. If the text file is in the same folder as the compiled program you don't need the path to the file.

Kilo

GRRR java annoys me.. it is nothing like c++!

[php]
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JTextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.BorderLayout;
import java.io.*;

public class lettercount extends JFrame
{
public lettercount()
{
this("");
}

public lettercount(String title)
{
super(title);

scanButton fileButton=new scanButton();
fileButton.setBounds(220,20,72,20); // x, y, width, height
fileButton.setVisible(true);

JTextField filePath=new JTextField();
filePath.setBounds(20,20,200,20);
filePath.setVisible(true);

getContentPane().setLayout(null);
getContentPane().add(fileButton);
getContentPane().add(filePath);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(450,250);
setVisible(true);
}

public static void main(String args[])
{
new lettercount("Letter Counter");

char[] letterArray=new char[26];
int[] letterCount=new int[26];
int count=0;

for(int i=97;i<=122;i++)
{
letterArray[count]=(char)i;
System.out.printf("%d = %s\n",count,letterArray[count]);
count++;
}
}

private static void scanFile(String tempFile)
{
//RandomAccessFile f = new RandomAccessFile ("file.in", "r");
//PrintWriter out = new PrintWriter(
// new BufferedWriter(
// new FileWriter("file.out")));
//String firstLine = f.readLine();
//out.print(firstLine);
//out.close();
}
}

class scanButton extends JButton implements ActionListener
{
scanButton()
{
super("Scan File");
addActionListener(this);
}

public void actionPerformed(ActionEvent arg0)
{
scanFile(filePath.getText());
}
}
[/php]

i need my scanFile function to be called from my button class! I understand access modifers and such but don't understand how to make this possible in Java.

__________________
"When in Rome, Do as the Romans Do"
"Beauty is in the eye of the BEER holder"
"Save your breath your going to need it for your blow up doll later"

SearchLores.org

titaniumdecoy

You need to put the ScanButton class inside the lettercount class (BTW, all public classes should start with a capital letter).

Alternatively you could put the ScanButton class in another file (ScanButton.java) and make the lettercount class recognize it making package package_name; the first line in both files.

Kilo

still getting the same access errors "Cannot find symbol"

[php]
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JTextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.BorderLayout;
import java.io.*;

public class lettercount extends JFrame
{
public lettercount()
{
this("");
}

public lettercount(String title)
{
super(title);

ScanButton fileButton=new ScanButton();
fileButton.setBounds(220,20,72,20); // x, y, width, height
fileButton.setVisible(true);

JTextField filePath=new JTextField();
filePath.setBounds(20,20,200,20);
filePath.setVisible(true);

getContentPane().setLayout(null);
getContentPane().add(fileButton);
getContentPane().add(filePath);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(450,250);
setVisible(true);
}

public static void main(String args[])
{
new lettercount("Letter Counter");

char[] letterArray=new char[26];
int[] letterCount=new int[26];
int count=0;

for(int i=97;i<=122;i++)
{
letterArray[count]=(char)i;
System.out.printf("%d = %s\n",count,letterArray[count]);
count++;
}
}

private static void scanFile(String tempFile)
{
//RandomAccessFile f = new RandomAccessFile ("file.in", "r");
//PrintWriter out = new PrintWriter(
// new BufferedWriter(
// new FileWriter("file.out")));
//String firstLine = f.readLine();
//out.print(firstLine);
//out.close();
}

class ScanButton extends JButton implements ActionListener
{
ScanButton()
{
super("Scan File");
addActionListener(this);
}

public void actionPerformed(ActionEvent arg0)
{
scanFile(filePath.getText());
}
}
}
[/php]

__________________
"When in Rome, Do as the Romans Do"
"Beauty is in the eye of the BEER holder"
"Save your breath your going to need it for your blow up doll later"

SearchLores.org

jaeusm

You're getting an error because the ScanButton class is calling a local method that does not exist. Thus, the "Cannot find symbol" error.

Your biggest obstacle at this point seems to be OOP in Java. Since you're just learning Java, I would highly recommend that you create each class in a separate file. I think this will help you conceptually. In order to invoke a non-static method in a different class, you must first obtain an object of that class (by creating a new object or passing an instance to the constructor). Once you have an object, you simply use the dot operator to call the method:

Arevos

It might help if you had a quick rundown of blocks and scopes in Java, Kilo. A block is any piece of code surrounded by brackets {}. A variable can be accessed only within the block in which it was defined. This is known as the variable's scope.

Some examples might help make it clear:
However, these bits of code will cause errors, because the program tries to access a variable that goes out of scope:
Using this knowledge, take another look at how classes are defined:
Thus, if you want filePath to be accessable by two different methods, you need to define it as in the class scope:
Also, you want to put all of the "getContentPane().add"s and "fileButton.setBounds" in the constructor of the class, because currently you're creating your GUI within the method that handles what do to when the button is clicked. And the user obviously can't click the button before the GUI has been created.