John Beese

public void determineFuelGrade() { if(regularJRadioButton.isSelected()) regularFuel = new RegularFuel(gallonsOfGas,regularGas); totalAmount = regularFuel.getResults(); totalSaleJTextField.setText("" + currency.format (totalAmount)); if(premiumJRadioButton.isSelected()) premiumFuel = new PremiumFuel(gallonsOfGas,premiumGas); totalAmount = premiumFuel.getResults(); totalSaleJTextField.setText("" + currency.format (totalAmount)); }

This one has proven to be difficult. It compiles and runs but only if i use the regular button first and even still that error message i used as my subject title. Im thinking i should be using an if/this combination, but i really dont know. Any suggestions?

sigh this keeps getting better and better,

public void determineFuelGrade() { if(regularJRadioButton.isSelected()) regularFuel = new RegularFuel(gallonsOfGas,regularGas); totalAmount = regularFuel.getResults(); totalSaleJTextField.setText("" + currency.format (totalAmount));) if(premiumJRadioButton.isSelected()) premiumFuel = new PremiumFuel(gallonsOfGas,premiumGas); totalAmount = premiumFuel.getResults(); totalSaleJTextField.setText("" + currency.format (totalAmount)); }

its compiles and runs but if i try to use the premium button first i get a whole bunch of errors and it doesnt calculate, if i put in the regular one first, then i can use the premium one runs fine. what gives?

Thanks Henry, i removed those () and the error went away, but 3 more popped up.... heh back to trying to figure this out.

//declaration codes omitted

/* main method */ public static void main(String[] args) { AcmeSelfServe application = new AcmeSelfServe(); application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public void enterJButtonActionPerformed(ActionEvent event) { try { gallonsOfGas = Integer.parseInt(numberOfGallonsJTextField.getText()); determineFuelGrade(); } catch(NumberFormatException exception) { JOptionPane.showMessageDialog(this, "Please Enter Number Of Gallons!", "Acount Approved", JOptionPane.QUESTION_MESSAGE); numberOfGallonsJTextField.setText(""); numberOfGallonsJTextField.requestFocusInWindow(); } } public void determineFuelGrade() { if(regularJRadioButton.isSelected()) regularFuel = new RegularFuel(numberOfGallons,RegularGas); totalAmount = regularFuel.getResults(); totalSaleJTextField.setText("" + currency.format (totalAmount)); } //clear and close commands public void resetJButtonActionPerformed(ActionEvent event) { numberOfGallonsJTextField.setText(""); numberOfGallonsJTextField.requestFocusInWindow(); } public void closeJButtonActionPerformed(ActionEvent event) { AcmeSelfServe.this.dispose(); } class RegularFuel() { int firstNumber; double secondNumber; double outputNumber; public RegularFuel(int integerOne, double integerTwo) { firstNumber = integerOne; secondNumber = integerTwo; calculateRegularTotal(); } public void calculateRegularTotal() { outputNumber = firstNumber * secondNumber; } public double getResults() { return outputNumber; } } }


Ive counted and recounted the brackets almost a dozen times and they are even, could anything else be causing this error?

MIssed a bracket, works fine now!

Im confused, I had 2 classes i needed to delcare a Tax Caculator class and a net Calculator, i did the same thing for both( I think) and i only get an error for the net calculator, Ive been doing this all day and im losing concentration. heres my entire import/ declare statement

/* import statement section */ import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.text.*; public class IncomeTax extends JFrame { /* declaration section */ //color objects Color black = new Color(0, 0, 0); Color white = new Color(255, 255, 255); // number formats DecimalFormat currency; //components JLabel grossWageJLabel; JTextField grossWageJTextField; JLabel incomeTaxJLabel; JTextField incomeTaxJTextField; JLabel netIncomeJLabel; JTextField netIncomeJTextField; JButton enterJButton; JButton clearJButton; JButton closeJButton; int grossEarnings; double uncleSamsCut; double netEarnings; //class declarations TaxCalculator taxCalculator; NetCalculator netCalculator;


this is almost my whole main method minus the clear and close commands
/* main method */ public static void main(String[] args) { IncomeTax application = new IncomeTax(); application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public void enterJButtonActionPerformed(ActionEvent event) { getGrossAmount(); } public void getGrossAmount() { try { grossEarnings = Integer.parseInt(grossWageJTextField.getText()); getTax(); } catch(NumberFormatException exception) { JOptionPane.showMessageDialog(this, "Please enter Gross Amount!", "Number Format Error", JOptionPane.ERROR_MESSAGE ); grossWageJTextField.setText(""); grossWageJTextField.requestFocusInWindow(); } } public void getTax() { taxCalculator = new TaxCalculator(grossEarnings,uncleSamsCut); uncleSamsCut = taxCalculator.getResults(); getNet(); incomeTaxJTextField.setText("" + currency.format (uncleSamsCut)); getNet(); } public void getNet() { netCalculator = new NetCalculator(grossEarnings,uncleSamsCut); netEarnings = netCalculator.getResults(); netIncomeJTextField.setText("" + currency.format (netEarnings)); }


The 2 pieces of code for the CalculateTax and CalcNet have been written and are further down. Are you saying i need to declare it in the import statements section? Gonna rest on it and see if i cant figure it out tomorrow.

So i rewrote the code and most of it works.

//class declarations TaxCalculator taxCalculator; NetCalculator netCalculator;


public void getNet() { netCalculator = new NetCalculator(grossEarnings,uncleSamsCut); netEarnings = netCalculator.getResults(); netIncomeJTextField.setText("" + currency.format (netEarnings)); }

Im getting a cant find symbol error message on the NetCalculator netCalculator; line
and the same error on netCalculator = new NetCalculator(grossEarnings,uncleSamsCut);

I used the same code for a dfifferent part of the program and it worked just fine, what gives?

fred rosenberger wrote:That is probably a mistake. if your current code is 200 lines, it is much easier to find the problem now than after writing an additional 200 lines.

right now, you're saying "I can't find the needle in this haystack, so I'm going to add MORE hay, and hope I find it".

well i wish i had read this before i went on writing all this other code, i wrote a bunch more stuff now im getting all sorts of errors from everywhere, and im really confused, Doesnt help Ive been getting pretty frustrated and changing stuff and re changing so now its just a big mess.

Ah ok, this is my first multi class program, I'll finish writing and see what happens. Thanks

processJButton = new JButton(); processJButton.setBounds(20, 300, 100, 20); processJButton.setFont(new Font("Default", Font.PLAIN, 12)); processJButton.setText("process"); processJButton.setForeground(black); processJButton.setBackground(white); contentPane.add(processJButton); processJButton.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent event) { processJButtonActionPerformed(event); } } );


public void processJButtonActionPerformed(ActionEvent event) { getIntegerOne(); }


These are my 2 sections of code that i think the problem is in. when i complie i get an error message on the public void processJButtonActionPerformed line saying. IncomeTax.java:180: class, interface, or enum expected. Ive googled it and the only thing i can find says i missed a semicolon or misspelled something, but it looks good to me. :/

oh duh, i had it declared as. averageScore = scoreAccumulator. not averageScore = scoreAccumulator / numberOfItems.

Thanks.

public static void main(String[] args) { GradeCalculator application = new GradeCalculator(); application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public void enterJButtonActionPerformed(ActionEvent event) { { scoreAmount = JOptionPane.showInputDialog("Number of Scores to be entered?"); numberOfScores = Integer.parseInt(scoreAmount); } for (counter = 0;counter < numberOfScores;counter++) { gradeScore = JOptionPane.showInputDialog("Enter score"); scoreValue = Integer.parseInt(gradeScore); scoreAccumulator += scoreValue; calculateAverage(); } } public void calculateAverage() { if (averageScore >= 89) {lastGrade = 'A';} else if (averageScore >= 79) {lastGrade = 'B';} else if (averageScore >= 69) {lastGrade = 'C';} else if (averageScore >= 64) {lastGrade = 'D';} else {lastGrade = 'F';} displayGrade(); } public void displayGrade() { gradeJTextField.setText("" + (lastGrade)); }

Its a grade calculator, It compiles and runs but the only grade it outputs is an F. This is my entire main method. It seems to me like it should work. But I dont know, if i change averageScore to scoreAccumulator, i get it to output an A but no other scores, Also it grades after the first score is entered. Cant figure out where the problem is.

ThanFixed it

/* import statement section */ import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.border.*; public class GradeCalculator extends JFrame { /* declaration section */ Color black = new Color(0, 0, 0); Color white = new Color(255, 255, 255); //components JLabel gradeJLabel; JTextField gradeJTextField; JLabel InstructionsJLabel; JButton enterJButton; JButton clearJButton; //variable int scoreAmount; int numberOfScores; int scoreValue; int scoreAccumulator; int gradeScore; public GradeCalculator() { createUserInterface(); } public void createUserInterface() { Container contentPane = getContentPane(); contentPane.setBackground(white); contentPane.setLayout(null); /* initialize components section */ gradeJLabel = new JLabel(); gradeJLabel.setBounds(75, 50, 100, 20); gradeJLabel.setFont(new Font("Default", Font.PLAIN, 12)); gradeJLabel.setText("Grade:"); gradeJLabel.setForeground(black); gradeJLabel.setHorizontalAlignment(JLabel.CENTER); contentPane.add(gradeJLabel); gradeJTextField = new JTextField(); gradeJTextField.setBounds(200, 50, 50, 20); gradeJTextField.setFont(new Font("Default", Font.PLAIN, 12)); gradeJTextField.setHorizontalAlignment(JTextField.CENTER); gradeJTextField.setForeground(black); gradeJTextField.setBackground(white); gradeJTextField.setEditable(false); contentPane.add(gradeJTextField); InstructionsJLabel = new JLabel(); InstructionsJLabel.setBounds(100, 200, 175, 20); InstructionsJLabel.setFont(new Font("Default", Font.PLAIN, 12)); InstructionsJLabel.setText("Click Enter To Start!"); InstructionsJLabel.setForeground(black); InstructionsJLabel.setHorizontalAlignment(JLabel.CENTER); contentPane.add(InstructionsJLabel); enterJButton = new JButton(); enterJButton.setBounds(70, 300, 75, 20); enterJButton.setFont(new Font("Default", Font.PLAIN, 12)); enterJButton.setText("Enter"); enterJButton.setForeground(black); enterJButton.setBackground(white); contentPane.add(enterJButton); enterJButton.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent event) { enterJButtonActionPerformed(event); } } ); clearJButton = new JButton(); clearJButton.setBounds(200, 300, 75, 20); clearJButton.setFont(new Font("Default", Font.PLAIN, 12)); clearJButton.setText("Clear"); clearJButton.setForeground(black); clearJButton.setBackground(white); contentPane.add(clearJButton); clearJButton.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent event) { clearJButtonActionPerformed(event); } } ); setTitle("GradeCalculator"); setSize(400, 400); setVisible(true); } /* main method */ public static void main(String[] args) { GradeCalculator application = new GradeCalculator(); application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public void enterJButtonActionPerformed(ActionEvent event) { { scoreAmount = JOptionPane.showInputDialog("Number of Scores to be entered"); numberOfScores = Integer.ParseInt(scoreAmount); } for (counter = 0;counter < numberOfScores;counter++) { gradeScore = JOptionPane.showInputDialog("Enter score;") scoreValue = Integer.parseInt(gradeScore); scoreAccumulator += scoreValue; } } public void clearJButtonActionPerformed(ActionEvent event) { gradeJTextField.setText(""); } }




Firstly I've only been doing this for about 4 weeks, Its a homework assignment for an online course. If I didnt know anything about this stuff a month ago, i feel like i know even less now. So if this is some kind of simple mistake or problem i apologize. The assignment is to make a simple grade calculator which is proving to be not so simple.

Edit: I found a set of brackets i missed after reading my post, that took away some error messages but added others. ill have to look over it now. getting incompatible type and cant find symbol error on lines 137 138 144 and 145.