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Old 05-31-2009, 03:58 PM   #1 (permalink)
polys
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Question cannot find symbol error

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Hello. I am new to java developing. I am using BB JDE to create an application. I started from a sample HelloWorld application i found online that consists of two files.

MobileApplication.java
Code:
package code;

import code.MyScreen;

import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.system.Characters; 


/**
 * Main application class.
 */
public class MobileApplication extends UiApplication {

    /**
     * Application entry point.
     * @param args application arguments.
     */
    public static void main(String[] args) {
        // creating application instance
        MobileApplication app = new MobileApplication();
        
        // entering event dispatcher
        app.enterEventDispatcher();
    } 

    /**
     * "MobileApplication" class default constructor.
     */
    public MobileApplication() {
        // creating screen instance
        MyScreen screen = new MyScreen();

        // displaying screen
        pushScreen(screen);
        
        
    }
    
    /**
     * Invoked when a key pressed.
     * @param key key pressed.
     * @param status status of key pressed.
     * @param time time in ms since last reset.
     * @return true if event consumed.
     */
    public boolean keyChar(char key, int status, int time) {
        boolean eventConsumed = false;

        //intercept the ESC key - exit the app if escape pressed
        if (key==Characters.ESCAPE) {
            System.exit(0);
            eventConsumed = true;            
        }
        return eventConsumed;
    }    
     
}
and MyScreen.java
Code:
package code;

import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.MenuItem;
import net.rim.device.api.ui.component.LabelField;
import net.rim.device.api.ui.component.Menu;
import net.rim.device.api.ui.component.SeparatorField;
import net.rim.device.api.ui.container.MainScreen;

/**
 * Screen class.
 */
public class MyScreen extends MainScreen {
    /**
     * "Close" menu item.
     */
    private MenuItem menuItemClose = new MenuItem("Close", 20, 400) {
        public void run() {
            // exiting from the application.
            System.exit(0);
        }
    };     

    /**
     * "Run" menu item.
     */
    private MenuItem menuItemRun = new MenuItem("Run", 20, 400) {
        public void run() {
            // displaying dialog box
            Dialog.alert("Hello :)");
        }
    };     


    /**
     * Default constructor.
     */
    public MyScreen() {
        super(); // calling parent's constructor

        addScreenItems(); // adding visual elements to the screen
    }

    /**
     * Adds visual elements to the screen.
     */
    public void addScreenItems() {
        setTitle("HelloWorld from Tbilisoft :)");
        this.add(new LabelField("Open menu and select \"Run\""));
        this.add(new SeparatorField());
        this.add(new LabelField("To close application - Open menu and select \"Close\" or click \"Escape\" key."));
    }

    /**
     * Processes trackwheel click.
     * @param status State of the modifier keys.
     * @param time Number of milliseconds since the device was turned on.
     * @return true if event consumed, otherwise returns false.
     */
    public final boolean trackwheelClick(int status, int time) {
        // displaying menu.
        Menu menu = new Menu();       
        makeMenu(menu, 0);
        menu.show();

        // event consumed
        return true;
    }    
    
    /**
     * Called to populate the menu.
     * 
     * @param menu Menu to which items should be added.
     * @param instance The instance of the desired menu. If your screen supports
     * only one menu, this may be ignored. By default, it is 0.
     */
    protected void makeMenu(Menu menu, int instance) {
        menu.add(menuItemRun);
        menu.add(menuItemClose);
    }           
}
I added a new file to the project called FileRead
Code:
package code;
import java.io.*;

public class FileRead {
                
    public FileRead() {    
    
    }
        
    public void read () {
        try{
            // Open the file that is the first 
            // command line parameter
            FileInputStream fstream = new FileInputStream("IMG_0001.doc");
            // Get the object of DataInputStream
            DataInputStream in = new DataInputStream(fstream);
            BufferedReader br = new BufferedReader(new InputStreamReader(in));
            String strLine;
            
            //Read File Line By Line
            while ((strLine = br.readLine()) != null) {
                // Print the content on the console
                System.out.println (strLine);
            }
            //Close the input stream
            in.close();
        } catch (Exception e){//Catch exception if any
            System.err.println("Error: " + e.getMessage());
        }
    }
}
and when i build the project i get the following errors
Code:
C:\Java Programming\Application\code\FileRead.java:14: cannot find symbol
symbol  : class FileInputStream
location: class code.FileRead
            FileInputStream fstream = new FileInputStream("IMG_0001.doc");
            ^
C:\Java Programming\Application\code\FileRead.java:14: cannot find symbol
symbol  : class FileInputStream
location: class code.FileRead
            FileInputStream fstream = new FileInputStream("IMG_0001.doc");
                                          ^
C:\Java Programming\Application\code\FileRead.java:17: cannot find symbol
symbol  : class BufferedReader
location: class code.FileRead
            BufferedReader br = new BufferedReader(new InputStreamReader(in));
            ^
C:\Java Programming\Application\code\FileRead.java:17: cannot find symbol
symbol  : class BufferedReader
location: class code.FileRead
            BufferedReader br = new BufferedReader(new InputStreamReader(in));
                                    ^
4 errors
I 've searched everywhere and i don't understand where the problem is. The projects builds fine without the FileRead file.
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