Please help with Java program

Errors driving me crazy! although compiles fine
I am working on a project for an online class - I am teaching myself really! My last assignment I cannot get to work. I had a friend who "knows" what he is doing help me. Well that didn't work out too well, my class is a beginner and he put stuff in that I never used yet. I am using Jgrasp and Eclipse. I really am trying but, there really is no teacher with this online class. I can't get questions answered in time and stuff goes past due. I am getting this error:
Exception in thread "main" java.lang.NullPointerException
at java.io.Reader.<init>(Reader.java:61)
at java.io.InputStreamReader.<init>(InputStreamReader .java:55)
at java.util.Scanner.<init>(Scanner.java:590)
at ttest.main(ttest.java:54)
----jGRASP wedge2: exit code for process is 1.
----jGRASP: operation complete.
This is my code:
import java.util.*;
import java.io.*;
public class ttest
static Scanner console = new Scanner(System.in);
public static void main(String[] args)throws IOException
FileInputStream fin = null; // input file reference
PrintStream floser = null; // output file references
PrintStream fwinner = null;
Scanner rs; // record scanner
Scanner ls; // line scanner
String inputrec; // full record buffer
int wins; // data read from each record
int losses;
double pctg;
String team;
String best = null; // track best/worst team(s)
String worst = null;
double worst_pctg = 2.0; // track best/worst pctgs
double best_pctg = -1.0;
int winner_count = 0; // counters for winning/losing records
int loser_count = 0;
// should check args.length and if not == 1 generate error
try
Scanner inFile = new Scanner(new FileReader("football.txt"));
catch( FileNotFoundException e )
System.exit( 1 );
try
floser = new PrintStream( new FileOutputStream( "loser.txt" ) );
fwinner = new PrintStream( new FileOutputStream( "winner.txt" ) );
catch( FileNotFoundException e )
System.out.printf( "unable to open an output file: %s\n", e.toString() );
System.exit( 1 );
try
rs = new Scanner( fin );
while( rs.hasNext( ) )
inputrec = rs.nextLine( ); /* read next line */
ls = new Scanner( inputrec ); /* prevents stumble if record has more than expected */
team = ls.next( );
wins = ls.nextInt();
losses = ls.nextInt();
if( wins + losses > 0 )
pctg = ((double) wins)/(wins + losses);
else
pctg = 0.0;
if( pctg > .5 )
if( pctg > best_pctg )
best_pctg = pctg;
best = team;
else
if( pctg == best_pctg )
best += ", " + team;
fwinner.printf( "%10s %2d %2d %5.3f\n", team, wins, losses, pctg );
winner_count++;
else
if( pctg < worst_pctg )
worst_pctg = pctg;
worst = team;
else
if( pctg == worst_pctg )
worst += ", " + team;
floser.printf( "%10s %2d %2d %5.3f\n", team, wins, losses, pctg );
loser_count++;
fin.close( );
floser.close( );
fwinner.close( );
catch( IOException e ) {
System.out.printf( "I/O error: %s\n", e.toString() );
System.exit( 1 );
System.out.printf( "%d teams have winning records; %d teams have losing records\n", winner_count, loser_count );
System.out.printf( "Team(s) with best percentage: %5.3f %s\n", best_pctg, best );
System.out.printf( "Team(s) with worst percentage: %5.3f %s\n", worst_pctg, worst );
The assignment is:
Create a Java program to read in an unknown number of lines from a data file. You will need to create the data file. The contents of the file can be found at the bottom of this document. This file contains a football team's name, the number of games they have won, and the number of games they have lost.
Your program should accomplish the following tasks:
1. Process all data until it reaches the end-of-file. Calculate the win percentage for each team.
2. Output to a file ("top.txt") a listing of all teams with a win percentage greater than .500. This file should contain the team name and the win percentage.
3. Output to a file ("bottom.txt") a listing of all teams with a win percentage of .500 or lower. This file should contain the team name and the win percentage.
4. Count and print to the screen the number of teams with a record greater then .500 and the number of teams with a record of .500 and below, each appropriately labeled.
5. Output in a message box: the team with the highest win percentage and the team with the lowest win percentage, each appropriately labeled. If there is a tie for the highest win percentage or a tie for the lowest win percentage, you must output all of the teams.
Dallas 5 2
Philadelphia 4 3
Washington 3 4
NY_Giants 3 4
Minnesota 6 1
Green_Bay 3 4

import java.util.*;
import java.io.*;
public class ttest
static Scanner console = new Scanner(System.in);
public static void main(String[] args)throws IOException
FileInputStream fin = null; // input file reference
PrintStream floser = null; // output file references
PrintStream fwinner = null;
Scanner rs; // record scanner
Scanner ls; // line scanner
String inputrec; // full record buffer
int wins; // data read from each record
int losses;
double pctg;
String team;
String best = null; // track best/worst team(s)
String worst = null;
double worst_pctg = 2.0; // track best/worst pctgs
double best_pctg = -1.0;
int winner_count = 0; // counters for winning/losing records
int loser_count = 0;
// should check args.length and if not == 1 generate error
try
Scanner inFile = new Scanner(new FileReader("football.txt"));
catch( FileNotFoundException e )
System.exit( 1 );
try
floser = new PrintStream( new FileOutputStream( "loser.txt" ) );
fwinner = new PrintStream( new FileOutputStream( "winner.txt" ) );
catch( FileNotFoundException e )
System.out.printf( "unable to open an output file: %s\n", e.toString() );
System.exit( 1 );
try
rs = new Scanner( fin );
while( rs.hasNext( ) )
inputrec = rs.nextLine( ); /* read next line */
ls = new Scanner( inputrec ); /* prevents stumble if record has more than expected */
team = ls.next( );
wins = ls.nextInt();
losses = ls.nextInt();
if( wins + losses > 0 )
pctg = ((double) wins)/(wins + losses);
else
pctg = 0.0;
if( pctg > .5 )
if( pctg > best_pctg )
best_pctg = pctg;
best = team;
else
if( pctg == best_pctg )
best += ", " + team;
fwinner.printf( "%10s %2d %2d %5.3f\n", team, wins, losses, pctg );
winner_count++;
else
if( pctg < worst_pctg )
worst_pctg = pctg;
worst = team;
else
if( pctg == worst_pctg )
worst += ", " + team;
floser.printf( "%10s %2d %2d %5.3f\n", team, wins, losses, pctg );
loser_count++;
fin.close( );
floser.close( );
fwinner.close( );
catch( IOException e ) {
System.out.printf( "I/O error: %s\n", e.toString() );
System.exit( 1 );
System.out.printf( "%d teams have winning records; %d teams have losing records\n", winner_count, loser_count );
System.out.printf( "Team(s) with best percentage: %5.3f %s\n", best_pctg, best );
System.out.printf( "Team(s) with worst percentage: %5.3f %s\n", worst_pctg, worst );
}

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import java.io.*;
import java.util.*;
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import java.awt.*;
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                                .addComponent(amtofloan)
                                .addComponent(text1, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addContainerGap(224, Short.MAX_VALUE)))))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(277, Short.MAX_VALUE)
                .addComponent(quitbutt1)
                .addGap(70, 70, 70))
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(31, 31, 31)
                .addComponent(amtofloan)
                .addGap(14, 14, 14)
                .addComponent(text1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(20, 20, 20)
                .addComponent(term)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(radiobutt1)
                .addGap(15, 15, 15)
                .addComponent(radiobutt2)
                .addGap(19, 19, 19)
                .addComponent(radiobutt3)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(calculatebutt1)
                    .addComponent(amt1))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(panescroll, javax.swing.GroupLayout.DEFAULT_SIZE, 112, Short.MAX_VALUE)
                .addGap(18, 18, 18)
                .addComponent(quitbutt1)
                .addGap(20, 20, 20))
        pack();
    } // Ends java components initialization
    private void quitbutt1ActionPerformed(java.awt.event.ActionEvent e)
    {// starts event_quitbutt1ActionPerformed
        System.exit(1);
    }// starts event_quitbutt1ActionPerformed
    static NumberFormat nf = NumberFormat.getCurrencyInstance(Locale.US);
    static NumberFormat np = NumberFormat.getPercentInstance();
    static NumberFormat ni = NumberFormat.getIntegerInstance();
    static BufferedReader br;
    private void calculatebutt1ActionPerformed(java.awt.event.ActionEvent e)
    { // starts event_calculatebutt1ActionPerformed
    public void actionToBePerformed(ActionEvent e)
     if ("Clear". equals(e.getActionCommand())
     calculatePayment();
     else if
     amtofloan.settext("");
     intrst.settext("");
     loanspan.settext("");
     monthlypayments.settext("");
     rate.settext("");
     term.settext("")
     intRate=Integer.parseInt(Rate.showtext());
     DecimalFormat money = new DecimalFormat("$0.00");
        amt1.setText(null);
        textarea1.setText(null);
        double pmntamt;
        double intrst;
        double amounnt1;
        int loanspan;
        double interestmonthly, principlemonthly, balanceofloan;
        int balanceremainder, amtoflines;
        np.setMinimumFractionDigits(2);
    br = new BufferedReader(new InputStreamReader(System.in));
amtoflines = 0;
        try
                amounnt1=Double.parseDouble(text1.getText());
        catch (Exception evt)
            amt1.setText("Enter total amount due on mortgage");
            return;
        if(radiobutt1.isSelected())
            intrst=0.0535;
            loanspan=7;
        else if(radiobutt2.isSelected())
            intrst=0.055;
            loanspan=15;
        else if(radiobutt3.isSelected())
            intrst=0.0575;
            loanspan=30;
        else
            amt1.setText("Select term of loan and interest rate");
            return;
    textarea1.append(" For mortgage amount " + nf.format(amounnt1)+"\n"+" with mortgage term " + ni.format(loanspan) + " years"+"\n"+" and interest rate of " + np.format(intrst)+"\n"+" the monthly payment is " + nf.format(getMortgagePmt(amounnt1, loanspan, intrst))+"\n"+"\n");
    balanceofloan = amounnt1 - ((getMortgagePmt(amounnt1, loanspan, intrst)) - (amounnt1*(intrst/12)));
    balanceremainder = 0;
    do
        interestmonthly = balanceofloan * (intrst/12);// monthly interest
         principlemonthly = (getMortgagePmt(amounnt1, loanspan, intrst)) - interestmonthly;//*Principal payment each month minus interest
        balanceremainder = balanceremainder + 1;
        balanceofloan = balanceofloan - principlemonthly;//remaining balance
        textarea1.append(" Principal on payment " + ni.format(balanceremainder) + " is " + nf.format(principlemonthly)+"\n");
                textarea1.append(" Interest on payment " + ni.format(balanceremainder) + " is " + nf.format(interestmonthly)+"\n");
                textarea1.append(" Remaining balance on payment " + ni.format(balanceremainder) + " is " + nf.format(balanceofloan)+"\n"+"\n"+"\n");
     while (balanceofloan > 1);
    }// starts event_jRadioBtton1Action Performed
    public static double getMortgagePmt(double balance, double term, double rate)
            double monthlyRate = rate / 12;
            double pmntamt = (balance * monthlyRate)/(1-Math.pow(1+monthlyRate, - term * 12));
            return pmntamt;
    private void radiobutt3ActionPerformed(java.awt.event.ActionEvent e)
    {// starts event_radiobutt3ActionPerformed
         if(radiobutt2.isSelected())
            radiobutt2.setSelected(false);
         if(radiobutt1.isSelected())
            radiobutt1.setSelected(false);
    }// ends event_radiobutt3ActionPerformed
    private void radiobutt2ActionPerformed(java.awt.event.ActionEvent e)
    {// starts event_radiobutt2ActionPerformed
         if(radiobutt1.isSelected())
            radiobutt1.setSelected(false);
         if(radiobutt3.isSelected())
            radiobutt3.setSelected(false);
    }// ends event_radiobutt2ActionPerformed
    private void radiobutt1ActionPerformed(java.awt.event.ActionEvent e)
    {// starts event_radiobutt1ActionPerformed
        if(radiobutt2.isSelected())
            radiobutt2.setSelected(false);
        if(radiobutt3.isSelected())
            radiobutt3.setSelected(false);
    }// ends event_radiobutt1ActionPerformed
    public static void main(String args[]) //main method start
        java.awt.EventQueue.invokeLater(new Runnable()
            public void run()
                new MortgageCalcv7().setVisible(true);
    // declares variables
    private javax.swing.JButton calculatebutt1;
    private javax.swing.JButton quitbutt1;
    private javax.swing.JButton clearbutton;
    private javax.swing.JLabel amtofloan;
    private javax.swing.JLabel term;
    private javax.swing.JLabel amt1;
    private javax.swing.JRadioButton radiobutt1;
    private javax.swing.JRadioButton radiobutt2;
    private javax.swing.JRadioButton radiobutt3;
    private javax.swing.JScrollPane panescroll;
    private javax.swing.JTextArea textarea1;
    private javax.swing.JTextField text1;
} //end MortgageCalcv7.javaEverything was fine until I tried to add the clear button. Now it won't compile and gives me the following errors. Please if you could find it in your kind heart to help a girl out, I would be forever in your debt. Thanks in advance!
MortgageCalcv7.java:211: illegal start of expression
public void actionToBePerformed(ActionEvent e)
^
MortgageCalcv7.java:213: ')' expected
     if ("Clear". equals(e.getActionCommand())
     ^
MortgageCalcv7.java:218: '(' expected
     else if
     ^
MortgageCalcv7.java:219: illegal start of expression
     ^
MortgageCalcv7.java:225: ';' expected
     term.settext("")
     ^
MortgageCalcv7.java:291: illegal start of expression
public static double getMortgagePmt(double balance, double term, double rate)
^
6 errors
Edited by: cheesegoddess on Oct 12, 2008 7:49 AM

You guys were very helpful, thank you! Thank you so very much!! The others needed braces somewhere and I took else out and that line compiles now. Thank you, thank you, thank you.
I am down to 1 error now. I cannot find where there is a missing bracket, if that is the problem.
The line erring is:
211    public void actionToBePerformed(ActionEvent e)and the error I am still getting is:
MortgageCalcv7.java:211: illegal start of expression
public void actionToBePerformed(ActionEvent e)
^
Any ideas? TIA.

Please help with common program!!

First I want to say that I did search to forum and I have not found a roman numeral conversion program written with a user defined class. Im not good with the terminology but the two programs are "working together" however I cannot get the output to print properly.......so maybe they arent working together. Anyway here is my code for the two and the output I am getting. The program is to convert a roman numeral to an integer value.
   public class Roman
       public static int numeralToInt(char ch)
         switch(ch)
            case 'M':
               return 1000;
            case 'D':
               return 500;
            case 'C':
               return 100;
            case 'L':
               return 50;
            case 'X':
               return 10;
            case 'V':
               return 5;
            case 'I':
               return 1;
            case '0':
               return 0;
         return 0;
import java.util.*;
   import javax.swing.JOptionPane;
   import java.io.*;
   import javax.swing.*;
    public class RomanMain extends Roman
      static Scanner console =new Scanner(System.in);
       public static void main(String[]args)
                          throws FileNotFoundException, InputMismatchException
         Roman r=new Roman();
         System.out.println("Please enter a Roman Numeral for Conversion");
         console.next();
         System.out.println("The converted value is:"+r);
   }This is very basic, all I am trying to do right now is get the correct output. I have tested it just by using M which should equal 1000. However I get the following.
The converted value is:Roman@173831bThanks in advance
Robert

Im not even gonna respond to your question db. I go to class 15 hours a week work 40 and spend another 20 studying for my OOP class and writing code, as well ascountless hours on my other homework. I work my ass off and when I get hung up I come here and read API's and browse forums archives looking for answers and when all else fails I come to the forums and ask. I've learned through surfing all these forums that most of you are assholes and have no interest in helping people. In fact most of you come off as thought the only reason you are here is cuase your self proclaimed java experts and you want all us newbies to bow down to you. I do appreciate everyone here that is not an asshole for helping, but anyone else that is just a total fuckwad can piss off. DB next time try asking a question without accusing someone of copying code.
Once again thanks to everyone that is polite about helping people. Im sure i violated teh code of conduct but if i dont get kicked out of here for good, when i get better at java I'm gonna devote time to helping students and not being a dickhead. Until then Adios I'm off to a forum that is helpful and not demeaning.
Robert

Need help with java program

Modify the Inventory Program by adding a button to the GUI that allows the user to move to the first item, the previous item, the next item, and the last item in the inventory. If the first item is displayed and the user clicks on the Previous button, the last item should display. If the last item is displayed and the user clicks on the Next button, the first item
should display. the GUI using Java graphics classes.
? Add a company logo to? Post as an attachment Course Syllabus
here is my code // created by Nicholas Baatz on July 24,2007
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class Inventory2
//main method begins execution of java application
public static void main(final String args[])
int i; // varialbe for looping
double total = 0; // variable for total inventory
final int dispProd = 0; // variable for actionEvents
// Instantiate a product object
final ProductAdd[] nwProduct = new ProductAdd[5];
// Instantiate objects for the array
for (i=0; i<5; i++)
nwProduct[0] = new ProductAdd("Paper", 101, 10, 1.00, "Box");
nwProduct[1] = new ProductAdd("Pen", 102, 10, 0.75, "Pack");
nwProduct[2] = new ProductAdd("Pencil", 103, 10, 0.50, "Pack");
nwProduct[3] = new ProductAdd("Staples", 104, 10, 1.00, "Box");
nwProduct[4] = new ProductAdd("Clip Board", 105, 10, 3.00, "Two Pack");
for (i=0; i<5; i++)
total += nwProduct.length; // calculate total inventory cost
final JButton firstBtn = new JButton("First"); // first button
final JButton prevBtn = new JButton("Previous"); // previous button
final JButton nextBtn = new JButton("Next"); // next button
final JButton lastBtn = new JButton("Last"); // last button
final JLabel label; // logo
final JTextArea textArea; // text area for product list
final JPanel buttonJPanel; // panel to hold buttons
//JLabel constructor for logo
Icon logo = new ImageIcon("C:/logo.jpg"); // load logo
label = new JLabel(logo); // create logo label
label.setToolTipText("Company Logo"); // create tooltip
buttonJPanel = new JPanel(); // set up panel
buttonJPanel.setLayout( new GridLayout(1, 4)); //set layout
// add buttons to buttonPanel
buttonJPanel.add(firstBtn);
buttonJPanel.add(prevBtn);
buttonJPanel.add(nextBtn);
buttonJPanel.add(lastBtn);
textArea = new JTextArea(nwProduct[3]+"\n"); // create textArea for product display
// add total inventory value to GUI
textArea.append("\nTotal value of Inventory "+new java.text.DecimalFormat("$0.00").format(total)+"\n\n");
textArea.setEditable(false); // make text uneditable in main display
JFrame invFrame = new JFrame(); // create JFrame container
invFrame.setLayout(new BorderLayout()); // set layout
invFrame.getContentPane().add(new JScrollPane(textArea), BorderLayout.CENTER); // add textArea to JFrame
invFrame.getContentPane().add(buttonJPanel, BorderLayout.SOUTH); // add buttons to JFrame
invFrame.getContentPane().add(label, BorderLayout.NORTH); // add logo to JFrame
invFrame.setTitle("Office Min Inventory"); // set JFrame title
invFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // termination command
//invFrame.pack();
invFrame.setSize(400, 400); // set size of JPanel
invFrame.setLocationRelativeTo(null); // set screem location
invFrame.setVisible(true); // display window
// assign actionListener and actionEvent for each button
firstBtn.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent ae)
textArea.setText(nwProduct[0]+"\n");
} // end firstBtn actionEvent
}); // end firstBtn actionListener
textArea.setText(nwProduct[4]+"n");
// prevBtn.addActionListener(new ActionListener()
// public void actionPerformed(ActionEvent ae)
// dispProd = (nwProduct.length+dispProd-1) % nwProduct.length;
// textArea.setText(nwProduct.display(dispProd)+"\n");
// } // end prevBtn actionEvent
// }); // end prevBtn actionListener
} // end main
} // end class Inventory2
class Product
protected String prodName; // name of product
protected int itmNumber; // item number
protected int units; // number of units
protected double price; // price of each unit
protected double value; // value of total units
public Product(String name, int number, int unit, double each) // Constructor for class Product
prodName = name;
itmNumber = number;
units = unit;
price = each;
} // end constructor
public void setProdName(String name) // method to set product name
prodName = name;
public String getProdName() // method to get product name
return prodName;
public void setItmNumber(int number) // method to set item number
itmNumber = number;
public int getItmNumber() // method to get item number
return itmNumber;
public void setUnits(int unit) // method to set number of units
units = unit;
public int getUnits() // method to get number of units
return units;
public void setPrice(double each) // method to set price
price = each;
public double getPrice() // method to get price
return price;
public double calcValue() // method to set value
return units * price;
} // end class Product
class ProductAdd extends Product
private String feature; // variable for added feature
public ProductAdd(String name, int number, int unit, double each, String addFeat)
// call to superclass Product constructor
super(name, number, unit, each);
feature = addFeat;
}// end constructor
public void setFeature(String addFeat) // method to set added feature
feature = addFeat;
public String getFeature() // method to get added feature
return feature;
public double calcValueRstk() // method to set value and add restock fee
return units * price * 0.05;
public String toString()
return String.format("Product: %s\nItem Number: %d\nIn Stock: %d\nPrice: $%.2f\nType: %s\nTotal Value of Stock: $%.2f\nRestock Cost: $%.2f\n\n\n",
getProdName(), getItmNumber(), getUnits(), getPrice(), getFeature(), calcValue(), calcValueRstk());
} // end class ProductAddI can not get all the buttons to work and do not know why can someone help me

You have to have your code formatted correctly to begin with before you add the code tags. All your current code is left-justified and is not indented correctly.
I only see that you've added an actionlistener to the "first" button.
I recommend that you:
1) again, do this first in a nonGUI class, then use this nonGUI class in your GUI class.
2) Have a integer variable that holds the location of the current Product that your application is pointing to.
3) Have a method called getProduct(int index) that returns the product that is at the location specified by the index in your array / arraylist / or whatever collection that you are using.
4) Have your first button set index to 0 and then call getProduct(index).
5) Have your last button set your index to the last product in your collection (i.e.: index = productCollection.length - 1 if this is an array), and then call getProduct(index).
5) Have your next button increment your index up to the maximum allowed and then call getProduct(index). If it's an array it goes up to the array length - 1.
6) If you want the next button to cause the index to roll over to the first, when you are at the last then then increment the index and mod it ("%" operator) by the length of the array...

Help with java program: Finding the remaining Gas in a Car

I am a java newbie and I know this is a simple program but I am not getting the required result. Any help will be appreciated.
Here is the code for Car.java :
class Car{
     public double gasTank;
     public double drive;
     public double fueleff;
     public Car()
          gasTank = 0;
     public Car(double rate)
          fueleff = rate;
          gasTank = 0;
     public void eff(double rate)
          fueleff = rate;
     public void drive(double amountDrove)
          drive = amountDrove;
          double amtRem = (gasTank-(drive/fueleff));
          gasTank = amtRem;
     public void addGas(double amountPumped)
          double amtRem = gasTank + amountPumped;
          gasTank = amtRem;
     public double getGas()
          return gasTank;
}Here is the code for CarTester.java :
public class CarTester {
public static void main(String[] arg) {
    Car myHybrid = new Car();
    double amtRem = myHybrid.getGas();
    myHybrid.eff(50);
    myHybrid.addGas(20);
    myHybrid.drive(100);
    System.out.println("Amount Remaining: " + amtRem + " Gallons");
}I should be getting 18 Gallons in the gasTank but I am getting 0.0. What am I doing wrong?

And replace
public void drive(double amountDrove)
drive = amountDrove;
double amtRem = (gasTank-(drive/fueleff));
gasTank = amtRem;
}with
public void drive(double amountDrove)
drive = amountDrove;
gasTank -= drive/fueleff; // same logic as for +=
}Cheers =)

Please help with my program

I'm a newbie, i wrote a simple dictanary program, but i can't make it run properly. there are no errors but there is a problem...
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.util.regex.*;
public class Dictionary{
public static void main(String args[]){
DicWin dic = new DicWin("Dictionary");
class DicWin extends Frame implements ActionListener{
Panel[] panels = new Panel[2];
private static String REGEX = "^";
Button ok;
TextField text;
String[] words;
TextArea textF;
public DicWin(String title){
     super(title);
     ReadDic("Mueller24.txt");
     setLayout(new GridLayout(2,1));
     panels[0] = new Panel();
     panels[1] = new Panel();
     First(panels[0]);
     Second(panels[1]);
     add(panels[0]);
     add(panels[1]);
     pack();
     setVisible(true);
public void First(Container con){
     ok = new Button("OK");
     text = new TextField(20);
     con.add(ok);
     ok.addActionListener(this);
     con.add(text);
public void Second(Container con){
     textF = new TextArea(5,20);
     con.add(textF);
public void actionPerformed(ActionEvent e)
String text2 = text.getText();
Pattern p = Pattern.compile(REGEX + text2);
for(int j=0;j<words.length;j++){
Matcher m = p.matcher(words[j]);
if(m.find())
     textF.setText(textF.getText() + "\n" + words[j]);
private void ReadDic (String FileName){
String line;
int i=0;
BufferedReader in = null;
try{
in = new BufferedReader(new FileReader("Mueller24.txt"));
     while((line = in.readLine())!=null)
     i++;
     words = new String;
     i=0;
     while((line = in.readLine())!=null)
     words[i]=line;
     i++;
catch(IOException e){
System.out.println("Error Loading the file.");

Please make the ReadDic() method as following.
private void ReadDic(String FileName) {
String line;
int i = 0;
BufferedReader in = null;
try {
in = new BufferedReader(new FileReader("Mueller24.txt"));
while ((line = in.readLine()) != null) {
i++;
words = new String[10];
i = 0;
while ((line = in.readLine()) != null) {
words[i] = line;
i++;
} catch (IOException e) {
System.out.println("Error Loading the file.");
Please notice the line
words = new String;
in your original program should be something like following,
words = new String[10]
and the line,
words = line;
should be
words[i] = line;
I hope this would help.
Pramoda

Need help with Java Programming

Hello All,
I dont know how to save all the lines separatly and then work with the numbers?
Example TxtIn:
2 5
0 9 2 3 4 // I dont know how many lines will appear, and dont know how many numbers in a line
1 2 3 9
1 5 4
2 0 0 5 6
2 5 1 9
4 6 1 5
4 9 1 8
9 1 4 8
9 5 0
Example TxtOut:
1 9 4 0
I would really appreciate your help in this.
In my code, i only past one time in the text file, and clear the numbers of the list, but i need to make more check =S
Here is the code:
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Scanner;
import java.util.StringTokenizer;
* @author Antonio
public class web {
    /** Creates a new instance of Main */
     * @param args the command line arguments
    public static void main(String[] args) throws FileNotFoundException {
        int contador;
        ArrayList<Integer> lista = new ArrayList<Integer>();
        Scanner scn = new Scanner(new File("in.txt"));
        try {
        PrintWriter fileOut = new PrintWriter(new FileWriter("out.txt"));
        int ciudades = scn.nextInt();
        int aerolineas = scn.nextInt();
        int ciudadabuscar = scn.nextInt();
        int aerolinea = scn.nextInt();
        int bandera=0;
        while (scn.hasNextLine()){
                String cad = scn.nextLine();
                StringTokenizer st = new StringTokenizer(cad," ");
         while (st.hasMoreTokens())
                String t = st.nextToken();
                lista.add ( Integer.parseInt(t) );
           int a[]= new int[lista.size()];
           for (int x=0; x<lista.size(); x++)
                        a[x] = lista.get(x);
                      for (int x=0; x<lista.size(); x++)
               for (x=1;x<lista.size();x++){
                        if (ciudadabuscar == a[0] && aerolinea == a[1])//tenia x=1
                            for (x=2;x<lista.size();x++)
                            { fileOut.printf("%d ",a[x]);
                              ciudadabuscar= a[2];
                              bandera = 1;}
                     lista.clear();
        if(bandera==0){
        fileOut.println("No hay destinos posibles por esta línea");
        fileOut.close();
        }catch(FileNotFoundException ex){}catch(IOException ex){}
}

#1 Solution is the same as i am working but...if i found AND another pair needs tobe searched...i dont know how to start again with step 1...
i onli continues reading..that is why i am never show
2 5//i am reading the file looking for 2 and 5
0 9 2 3 4
1 2 3 9
1 5 4 // I NEVER show the number 4....
2 0 0 5 6
2 5 1 9 // here i found them...and now i have to look in the file 1 5 and 9 5 (but 1 5 are before this..so i can never found them)
4 6 1 5
4 9 1 8
9 1 4 8
9 5 0 // here i found 9 5
Correct OutTxt: 1 9 4 0
My OutTxt: 1 9 0...Never show the number 4, because i dont know how to start again...
thank u
Edited by: Ing_Balderas on Dec 11, 2009 2:25 PM

Please help with java.text.MessageFormat...

Hi all
I'm reasonably new to java and have been struggling with this one for a while. I wonder if anyone can help?
The following code...
Object[] testArgs = {new Long(1273), "MyDisk"};
MessageFormat form = new MessageFormat(
"The disk \"{1}\" contains {0} file(s).");
System.out.println(form.format(testArgs));
...gives the following output...
The disk "MyDisk" contains 1,273 file(s).
I simply want to get rid of the comma, so that the output becomes...
The disk "MyDisk" contains 1273 file(s).
Any ideas? Many thanks for reading my thread and for any help you may be able to offer!
Kind Regards
Jon

contains {0,number,#} file(s).

Help with Java program and PKGBUILD

Hey guys, I'm fairly new to Arch and very new to making packages. I write a lot of my stuff in Java, and I know that Java is normally a pain to package on Linux systems. I have had a good look at the Java Packaging Guidelines, http://wiki.archlinux.org/index.php/Jav … Guidelines and I see that it says about not bothering compiling from Java source and just provide the JARs (am I correct?). So my question is, if I were to make a PKGBUILD for my Java based program, would the build() block just basically create the folders in the filesystem and move the content (JARs etc) to the folders? And then create the shell script in the appropriate location?
Forgive me I have the completely wrong idea...
Many thanks

Hey guys, I'm fairly new to Arch and very new to making packages. I write a lot of my stuff in Java, and I know that Java is normally a pain to package on Linux systems. I have had a good look at the Java Packaging Guidelines, http://wiki.archlinux.org/index.php/Jav … Guidelines and I see that it says about not bothering compiling from Java source and just provide the JARs (am I correct?). So my question is, if I were to make a PKGBUILD for my Java based program, would the build() block just basically create the folders in the filesystem and move the content (JARs etc) to the folders? And then create the shell script in the appropriate location?
Forgive me I have the completely wrong idea...
Many thanks

Please help with Java program

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