Java Programming Forums - The Java Community - What's Wrong With My Code?

How to read different data segments from a text file?

alutchman — Tue, 18 Jun 2013 04:08:31 GMT

i am trying to read this data from a text file

//contains an account no. of type string followed by account balance of type double
3000 1200.00
1000 300.00
4000 8000.00
// the 0 represents the start of a new data segment
0
// contains a transaction type either DEP "deposit" or WID "withdrawal" of type String followed by an account no. of type String and "amount" of the particular transaction either
DEP 3000 600.00
WID 4000 2000.00
// the PRINT represents the end of file and print all the account information
PRINT

The question is, Read the data from the file, store the account information in objects in an array and perform the specific transactions and finally print the Information

i am able to read the text file and store the first data segment containing the account no and balance into an object in an array
however, my problem is reading the data segment from 0 and storing the transactions

PLEASE HELP..ANY SUGGESTIONS..
Regards
aNiL

What is wrong with my code

chaffee — Mon, 17 Jun 2013 20:13:26 GMT

I was following a tutorial exactly, i made sure everything looked the same but it still doesnt work.
I am using the latest version of NetBeans 7.3.1

Code :

package javagame;
 
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.KeyAdapter; 
import java.awt.event.KeyEvent;
import javax.swing.JFrame;
 
public class JavaGame extends JFrame {
 
    int x, y;
    private Image dbImage;
    private Graphics dbg;
 
    public class AL extends KeyAdapter {
        public void KeyPressed(KeyEvent e){
           int KeyCode = e.getKeyCode();        
           if(KeyCode == e.VK_LEFT) {
              x--;
           }
           if(KeyCode == e.VK_RIGHT) {
               x++;
           }
            if(KeyCode == e.VK_UP) {
               y--;
           }
             if(KeyCode == e.VK_DOWN) {
               y++;
 
           }
    }
    public void KeyReleased (KeyEvent e) {
 
    }   
  }
  public JavaGame (){
    addKeyListener(new JavaGame.AL());    
    setTitle("Java Game");
    setSize(500, 500);
    setResizable(true);
    setVisible(true);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
    x = 150;
    y = 150;
}
 
  public void paint(Graphics g){
      dbImage = createImage(getWidth(), getHeight());
      dbg = dbImage.getGraphics();
      paintComponent(dbg);
      g.drawImage(dbImage, 0, 0, this);
  }
 
  public void paintComponent(Graphics g){
      g.fillOval(x, y, 15, 15);
      repaint(); 
  }
 
  public static void main(String[] args){
      new JavaGame(); 
  }
 
}

Recursive Method to count vowel

hofamilyiiii — Mon, 17 Jun 2013 16:13:43 GMT

public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter a string: ");
String word = input.nextLine();
int i = 0, count = 0;
checkVowel(word, i, word.length()-1, count);
}

public static void checkVowel(String word, int start, int last, int count) {
if (start == last)
{
System.out.println("Total number of vowel is " + count);
}
else
{
if (word.charAt(start) == 'a' || word.charAt(start) == 'e' || word.charAt(start) == 'i' ||
word.charAt(start) == 'o' || word.charAt(start) == 'u') {
count++;
}
checkVowel(word, start++, last, count);
}
}

this is my code, but somehow i gt "Exception in thread "main" java.lang.StackOverflowError" , can anyone help find what's the problem??

Connect to linux server

ggupta — Mon, 17 Jun 2013 10:32:12 GMT

I am connecting to linux server using java , i want to automate the process so that the java code runs every half an hour .How can I do it ?

Is it possible for me to simplify this code to not use "super" here - I did not understand this

sumoon — Mon, 17 Jun 2013 09:34:00 GMT

public class Reset extends JButton {
Reset() {
super("Reset");
super.setText("Reset");
int h = 20, w = 20;
int x = 0 * 20; int y = 7 * 30;
setBounds(x, y, h, w);
addActionListener(new ResetActionListener()); setVisible(true);
}
private class ResetActionListener implements ActionListener {
public void actionPerformed(ActionEvent ae) {
ConnectClient.reset();
}
}
}

Need Help For Adding image into Word document Using APache POI

nareshdev — Mon, 17 Jun 2013 07:44:11 GMT

Hi,

We are creating word document using Apache POI and need to write image into word document using Apache POI but we are unable to get images in word document . Please any one help us regarding this.

Thanks,

java pizza program beginerr

nikki101 — Mon, 17 Jun 2013 01:43:07 GMT

I am wondering why my code is not working for getting the toppings the user inputs as a number.

User input error help.

Puffy Fawter — Sun, 16 Jun 2013 23:50:16 GMT

Alright so basically today I decided I wanted to learn Java as it has been on my to do list for about 6 months now and basically I asked a few friends who knew how to program and they redirected me to thenewboston's tutorials on java programming. Everything was going smooth for awhile I was understanding everything he said and I was taking notes and such and then I got on to his user input tutorial. Now I listened to what he said, took notes on what he said what this and that did, and typed in what he wrote down. Now what happened whenever I ran it on Eclipse is that it gave me this error message.Exception in thread "main" java.lang.Error: Unresolved compilation problem: The method nextline() is undefined for the type Scanner at apples.main(apples.java:6)Could someone please help on what I should do. The code to what I'm trying to use to get user input is this....

Quote:

import java.util.Scanner;

public class apples{
public static void main(String args[]){
Scanner bucky = new Scanner(System.in);
System.out.println(bucky.nextline());
}
}

global variables for threads

barhom — Sun, 16 Jun 2013 16:45:33 GMT

hey i have java assignment ,its like these i have 2 mythreads class which extend the original thread and main , in which class i need to put global variables for both thread and main to use,and how from thread code or main code itself i can reach them(use them as well)

how to print matrix into file ?

viki1719 — Sun, 16 Jun 2013 12:50:34 GMT

Hi everyone,
I want to know that how to write a matrix into text file?
actually here i am trying to write a program which take no of rows and columns from user and also element of matrix and then i want to store that matrix into a separate file(abc.txt) and it's Transpose result
want to store in separate file(xyz.txt). for this i am stuck in, i am not getting idea that how to save my matrix into a file...
i have been searched regarding of my this problem but did not find any clue . let me post my code whatever effort i did to do...

Code :

public class MyTransposeOfMatrix {
    public static void main(String[] args) throws FileNotFoundException {
 
 
        PrintWriter pw =new PrintWriter(
           "D:/SCJP Sun/netbeans/scjp practice/src/com/scjp/braintraser/xyz.txt");
        int rows, columns;
        System.out.println("Please enter no of rows:");
        Scanner sc=new Scanner(System.in);
        rows=sc.nextInt();
        System.out.println("Please enter no of columns:");
        columns=sc.nextInt();
        int matrix[][]=new int[rows][columns];
        int tmatrix[][]=new int[columns][rows];
        System.out.println("please enter element for matrix:");
        for(int i=0;i

please help me.....
thanks for your time to read this thread.

Code doesn't work despite being from book

Math2 — Sun, 16 Jun 2013 12:38:24 GMT

As a quick preface, I bought the book Teach yourself Java in 21 Days to, strangely enough, learn Java. Being a complete beginner who has no idea what I'm doing, I tried running the first example program that they gave me, and it didn't work. I reverted back the the Netbeans they used in the book but no luck..Here are the files

Code Java:

class VolcanoRobot {
    String status;
    int speed;
    float temperature;
 
    void checkTemperature() {
        if (temperature > 660) {
            status = "returning home";
            speed = 5;
        }
    }
 
    void showAttributes() {
        System.out.println("Status: " + status);
        System.out.println("Speed: " + speed);
        System.out.println("Temperature: " + temperature);
    }
}

File 2

Code Java:

class VolcanoApplication {
    public static void main(String[] arguments) {
        VolcanoRobot dante = new VolcanoRobot();
        dante.status = "exploring";
        dante.speed = 2;
        dante.temperature = 510;
 
        dante.showAttributes();
        System.out.println("Increasing speed to 3.");
        dante.speed = 3;
        dante.showAttributes();
        System.out.println("Changing temperature to 670.");
        dante.temperature = 670;
        dante.showAttributes();
        System.out.println("Checking the temperature.");
        dante.checkTemperature();
        dante.showAttributes();
    }
}

Thanks in advance

Draw the Line

teymoorei — Sun, 16 Jun 2013 12:31:24 GMT

What is wrong with this code

__________________________________________________ _________________________________

package javaclass;

import java.awt.BorderLayout;
import java.awt.Point;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class PaintPanel extends JPanel {

private int pointCount = 0; // count number of points
// array of 10000 java.awt.Point references
private Point points[] = new Point[10000];

// set up GUI and register mouse event handler
public PaintPanel() { // اینجا معلوم نیست چه ورودی داره

// handle frame mouse motion event
addMouseMotionListener(
new MouseMotionAdapter() { // anonymous inner class {
// store drag coordinates and repaint
public void mouseDragged(MouseEvent event) {
if (pointCount < points.length) {
points[ pointCount] = event.getPoint(); // find point
pointCount++; // increment number of points in array
repaint(); // repaint JFrame
} // end if
} // end method mouseDragged
} // end anonymous inner class
); // end call to addMouseMotionListener
} // end PaintPanel constructor

// draw oval in a 4-by-4 bounding box at specified location on window
public void paintComponent(Graphics g) { // اینجا هم میگه تعریف شده نیست
super.paintComponent(g); // clears drawing area
// draw all points in array
for (int i = 0; i < pointCount; i++) {
g.fillOval(points[ i].x, points[ i].y, 20, 20);
}
} // end method paintComponent

public static void main(String args[]) {
// create JFrame
JFrame application = new JFrame("A simple paint program");
PaintPanel paintPanel = new PaintPanel(); // create paint panel
application.add(paintPanel, BorderLayout.CENTER); // in center
// create a label and place it in SOUTH of BorderLayout
application.add(new JLabel("Drag the mouse to draw"),
BorderLayout.SOUTH);
application.setDefaultCloseOperation(JFrame.EXIT_O N_CLOSE);
application.setSize(400, 200); // set frame size
application.setVisible(true); // display frame
} // end main
} // end class PaintPanel

return type

shahrukh0603 — Sun, 16 Jun 2013 06:32:08 GMT

public class Name {
static int a;
int b=0;
public void fuck(int d){
a=a+1;
b=b+1;
System.out.println(a);
System.out.println(b);
System.out.println(d);
return ;

the function is void type.. and in the end i also wrote return..but no value...
the function runs with no error... why return is not creating a problem

[SOLVED] Robot Class

keepStriving — Sun, 16 Jun 2013 01:52:59 GMT

I've been trying to use the Robot class over a network with a server opening notepad and typing some words in on the client desktop though the most I have been able to achieve is to open notepad and even then my client gives an error, the server continues to run until I shut notepad though gives an error too. "HELOWORLD" instead of "HELLOWORLD" is the output wherever the key cursor is resting even if inside the client code, notepad is left empty. Can anyone please help.

Code :

import java.net.*;
import java.io.*;
 
public class Server{
public static void main(String[]args)throws IOException{
	ServerSocket serverSocket = new ServerSocket(8976);
	Socket socket = null;
	ObjectOutputStream out = null;
 
	try{
		socket = serverSocket.accept();
		out = new ObjectOutputStream(socket.getOutputStream());
		out.writeObject(new ControlObject());
	}catch(IOException e){
		e.printStackTrace();
	}finally{
		out.close();
		socket.close();
	}
}
}

Code :

import java.io.*;
import java.net.*;
 
public class Client{
	public static void main(String[]args)throws IOException, ClassNotFoundException{
		final Socket socket = new Socket("127.0.0.1",8976);
		final ObjectInputStream in = new ObjectInputStream(socket.getInputStream());
 
 
 
	    try {
		    Object s = in.readObject();    
		}catch(IOException e){
			e.printStackTrace();
		}finally{
			in.close();
            socket.close();
 
		}
 
 
 
	}
}

Code :

import java.awt.AWTException;
import java.awt.Robot;
import java.awt.event.KeyEvent;
import java.io.IOException;
import java.io.Serializable;
 
public class ControlObject implements Serializable{
	public ControlObject() throws IOException {
		try {
			int KeyInput[] = {
					KeyEvent.VK_H,
					KeyEvent.VK_E,
					KeyEvent.VK_L,
					KeyEvent.VK_L,
					KeyEvent.VK_O,
					KeyEvent.VK_W,
					KeyEvent.VK_O,
					KeyEvent.VK_R,
					KeyEvent.VK_L,
					KeyEvent.VK_D,
			};
			Robot robot = new Robot();
			robot.delay(5000);
			Runtime.getRuntime().exec("notepad");
			robot.keyPress(KeyEvent.VK_SHIFT);
			for(int i = 0;i

GridBagLayout help

darren465 — Sat, 15 Jun 2013 20:45:24 GMT

Hello,

I am currently creating a GUI using GridBagLayout and I am having an issue with putting JLabels next to JPanels. I'm pairing JLabels with JTextFields in the same row as titles for data. For some reason the JLabels seem to be much bigger than the JTextFields even though I used the same Weight. Also there seems to be extra padding to the right of each JLabel because there is a lot of blank space before the JTextField begins. Ideally I would like the JTextField and JLabels to each take up half of the space in the panel.

The panel I'm referring to is the far right panel (helper date, helper time, etc.) Here is the code:

Code :

package NewGui;
 
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.SystemColor;
 
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.UIManager;
import javax.swing.UIManager.LookAndFeelInfo;
import javax.swing.border.BevelBorder;
import javax.swing.border.EtchedBorder;
 
public class NewGui extends JFrame {
 
	JPanel mainGridBagPanel = new JPanel(new GridBagLayout());
	JPanel topButtonPanel = new JPanel(new GridBagLayout());
 
	JPanel helperAddressPanel = new JPanel(new GridBagLayout());
	JPanel helperNamePanel = new JPanel(new GridBagLayout());
	JPanel filerInfoPanel = new JPanel(new GridBagLayout());
	JPanel dupPanel = new JPanel(new GridBagLayout());
 
	JButton helpInformationButton = new JButton();
	JButton returnPreviousButton = new JButton();
	JButton viewErrorLogButton = new JButton();
	JLabel listLabel = new JLabel();
 
	JLabel helperAddressLabel = new JLabel();
	JTextField helperAddressOne = new JTextField();
	JTextField helperAddressTwo = new JTextField();
	JTextField coLine = new JTextField();
	JLabel codeLabel = new JLabel();
	JTextField code = new JTextField();
	JTextField phoneNbr = new JTextField();
 
	JLabel helperNameLabel = new JLabel();
	JTextField addressOne = new JTextField();
	JTextField addressTwo = new JTextField();
	JTextField city = new JTextField();
	JTextField prov = new JTextField();
	JTextField cntry = new JTextField();
	JTextField postalCd = new JTextField();
	JLabel dateLabel = new JLabel();
	JTextField date = new JTextField();
 
	JLabel helperDateLabel = new JLabel();
	JTextField helperDate = new JTextField();
	JLabel timeLabel = new JLabel();
	JTextField time = new JTextField();
	JLabel locationLabel = new JLabel();
	JTextField location = new JTextField();
	JLabel descriptionLabel = new JLabel();
	JTextField description = new JTextField();
	JLabel destinationLabel = new JLabel();
	JTextField destination = new JTextField();
	JLabel typeLabel = new JLabel();
	JTextField type = new JTextField();
	JLabel durationLabel = new JLabel();
	JTextField duration = new JTextField();
 
 
 
	public NewGui()
	{
		setPanelInfo();
		setLabels();
		setValues();
 
		this.getContentPane().add(mainGridBagPanel);
		GridBagConstraints gb = new GridBagConstraints();
		gb.fill = GridBagConstraints.BOTH;
		gb.gridx = 0;
		gb.gridy = 0;
		gb.weightx = 0.5;
		gb.weighty = 0.5;
		gb.gridwidth = 3;
		gb.insets = new Insets(5,5,0,5); 
		mainGridBagPanel.add(topButtonPanel, gb);
		gb.gridy = 1;
		gb.gridwidth = 1;
		gb.insets = new Insets(5,5,5,0); 
		mainGridBagPanel.add(helperAddressPanel, gb);
		gb.gridx = 1;
		gb.insets = new Insets(5,5,5,0); 
		mainGridBagPanel.add(helperNamePanel, gb);
		gb.gridx = 2;
		gb.insets = new Insets(5,5,5,5); 
		mainGridBagPanel.add(filerInfoPanel, gb);
//		gb.gridx = 3;
//		gb.insets = new Insets(10,10,10,10); 
//		mainGridBagPanel.add(dupPanel, gb);
 
		gb.gridx = 0;
		gb.gridy = 0;
		gb.insets = new Insets(5,5,5,0);  
		topButtonPanel.add(helpInformationButton, gb);
		gb.gridx = 1;
		gb.insets = new Insets(5,5,5,0);  
		topButtonPanel.add(listLabel, gb);
		gb.gridx = 2;
		gb.insets = new Insets(5,5,5,0);  
		topButtonPanel.add(returnPreviousButton, gb);
		gb.gridx = 3;
		gb.insets = new Insets(5,5,5,5);  
		topButtonPanel.add(viewErrorLogButton, gb);
 
		gb.gridx = 0;
		gb.gridy = 0;
		gb.insets = new Insets(5,5,5,0); 
		helperAddressPanel.add(helperAddressLabel, gb);
		gb.gridy = 1;
		gb.insets = new Insets(0,0,0,0); 
		helperAddressPanel.add(helperAddressOne, gb);
		gb.gridy = 2;
		helperAddressPanel.add(helperAddressTwo, gb);
		gb.gridy = 3;
		helperAddressPanel.add(coLine, gb);
		gb.gridy = 4;
		helperAddressPanel.add(codeLabel, gb);
		gb.gridy = 5;
		helperAddressPanel.add(code, gb);
		gb.gridy = 6;
		helperAddressPanel.add(phoneNbr, gb);
 
		gb.gridx = 0;
		gb.gridy = 0;
		gb.gridwidth = 3;
		gb.insets = new Insets(5,5,5,0); 
		helperNamePanel.add(helperNameLabel, gb);
		gb.gridy = 1;
		gb.insets = new Insets(0,0,0,0);
		helperNamePanel.add(addressOne, gb);
		gb.gridy = 2;
		helperNamePanel.add(addressTwo, gb);
		gb.gridy = 3;
		helperNamePanel.add(city, gb);
		gb.gridy = 4;
		gb.gridwidth = 1;
		helperNamePanel.add(prov, gb);
		gb.gridx = 1;
		helperNamePanel.add(cntry, gb);
		gb.gridx = 2;
		helperNamePanel.add(postalCd, gb);
		gb.gridx = 0;
		gb.gridy = 5;
		gb.gridwidth = 3;
		helperNamePanel.add(dateLabel, gb);
		gb.gridy = 6;
		helperNamePanel.add(date, gb);
 
		gb.gridx = 0;
		gb.gridy = 0;
		gb.gridwidth = 1;
		gb.insets = new Insets(5,5,5,0);
		filerInfoPanel.add(helperDateLabel, gb);
		gb.gridx = 1;
		gb.insets = new Insets(0,0,0,0);
		filerInfoPanel.add(helperDate, gb);
		gb.gridx = 0;
		gb.gridy = 1;
		gb.insets = new Insets(0,5,0,0);
		filerInfoPanel.add(timeLabel, gb);
		gb.gridx = 1;
		gb.insets = new Insets(0,0,0,0);
		filerInfoPanel.add(time, gb);
		gb.gridx = 0;
		gb.gridy = 2;
		gb.insets = new Insets(0,5,0,0);
		filerInfoPanel.add(locationLabel, gb);
		gb.gridx = 1;
		gb.insets = new Insets(0,0,0,0);
		filerInfoPanel.add(location, gb);
		gb.gridx = 0;
		gb.gridy = 3;
		gb.insets = new Insets(0,5,0,0);
		filerInfoPanel.add(descriptionLabel, gb);
		gb.gridx = 1;
		gb.insets = new Insets(0,0,0,0);
		filerInfoPanel.add(description, gb);
		gb.gridx = 0;
		gb.gridy = 4;
		gb.insets = new Insets(0,5,0,0);
		filerInfoPanel.add(destinationLabel, gb);
		gb.gridx = 1;
		gb.insets = new Insets(0,0,0,0);
		filerInfoPanel.add(destination, gb);
		gb.gridx = 0;
		gb.gridy = 5;
		gb.insets = new Insets(0,5,0,0);
		filerInfoPanel.add(typeLabel, gb);
		gb.gridx = 1;
		gb.insets = new Insets(0,0,0,0);
		filerInfoPanel.add(type, gb);
		gb.gridx = 0;
		gb.gridy = 6;
		gb.insets = new Insets(0,5,0,0);
		filerInfoPanel.add(durationLabel, gb);
		gb.gridx = 1;
		gb.insets = new Insets(0,0,0,0);
		filerInfoPanel.add(duration, gb);
 
 
	}
 
	public void setPanelInfo()
	{
		topButtonPanel.setBorder(BorderFactory.createBevelBorder(BevelBorder.RAISED));
		topButtonPanel.setBackground(SystemColor.activeCaption);
 
		helperAddressPanel.setBorder(BorderFactory.createBevelBorder(BevelBorder.RAISED));
		helperAddressPanel.setBackground(SystemColor.activeCaption);
 
		helperNamePanel.setBorder(BorderFactory.createBevelBorder(BevelBorder.RAISED));
		helperNamePanel.setBackground(SystemColor.activeCaption);
 
		filerInfoPanel.setBorder(BorderFactory.createBevelBorder(BevelBorder.RAISED));
		filerInfoPanel.setBackground(SystemColor.activeCaption);
 
	}
 
	public void setLabels()
	{
 
		helpInformationButton.setText("Help with information");
		returnPreviousButton.setText("Return to previous screen");
		viewErrorLogButton.setText("View error log");
		listLabel.setText("List");
		listLabel.setHorizontalAlignment(SwingConstants.CENTER);
		listLabel.setBorder(BorderFactory.createEtchedBorder(EtchedBorder.RAISED, Color.BLACK, Color.BLACK));
		listLabel.setOpaque(true);
		listLabel.setBackground(SystemColor.control);
 
		helperAddressLabel.setText("Helper Address");
		codeLabel.setText("Code");
 
		helperNameLabel.setText("Helper Name");
		dateLabel.setText("Data");
 
		helperDateLabel.setText("Helper Date");
		timeLabel.setText("Time");
		locationLabel.setText("Location");
		descriptionLabel.setText("Destination");
		destinationLabel.setText("Description");
		typeLabel.setText("Type");
		durationLabel.setText("Duration");
 
 
	}
 
	public void setValues()
	{
 
 
	}
 
 
 
	public static void main (String args[])
	{
 
		try {
			for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
				if ("Nimbus".equals(info.getName())) {
					UIManager.setLookAndFeel(info.getClassName());
					break;
				}
			}
		} catch (Exception e) {
			// If Nimbus is not available, you can set the GUI to another look and feel.
		}
 
		NewGui gui = new NewGui();
		gui.pack();
		gui.setVisible(true);
 
 
 
	}
 
}

Any help is greatly appreciated.

Thanks.