Step 1 – Make the GPA calculations work Your job is to process the grade and units information when the user clicks the ADD or Reset buttons and to compute the GPA when the user clicks the GPA button. There are five (5) places in the given code for you to add your code. Each of these is commented with a brief description of your task followed by the phrase “Your code here (n of 5)….”. • The variable totalUnits stores the total credits of all classes taken. • The variable gradePoints stores the total grade points earned in those classes taken. For example, if you got a B in a 4 credit hour course, you earn 3.0 x 4 = 12.0 grade points. • The variable totalGPA stores the total GPA, which is simply the total grade points earned divided by the total units taken. For example, if you got an A in a 3 credit course, a C in a 5 credit course, and a B in a 4 credit course, you have (4.0 x 3) + (2.0 x 5) + (3.0 x 4) = 34.0 grade points and 3 + 5 + 4 = 12 total units, so the GPA is 34.0 / 12 = 2.833. Step 2 – Add exception handling You may notice that when you accidentally enter a non-number in the units field, it crashes your program. Instead of crashing add exception handling (using a try-catch block) to catch the problem. The error message tells you which statement causes the exception. Then you can wrap all the code related to that task (updating the points and units running totals) in a try-catch block. Use a JOptionPane.showMessageDialog(…) to report the error. GPACalculator XCompileUndoCutСopyPasteFind...CloseSource Code//Show results on message boxJOptionPane.showMessageDialog(null, msg, "Result",JOptionPane.INFORMATION_MESSAGE);else{|// Compute totalGPA by dividing the total grade points by the total units|// Your code here (4 of 5)....totalGPA = gradePoints / totalUnits;DecimalFormat df = new DecimalFormat("0.000");String outputStr = "GPA:+ df.format(totalGPA) + "\n";//Show results on message boxJOptionPane.showMessageDialog(null, outputStr, "Result",JOptionPane.INFORMATION_MESSAGE);int answer = JOptionPane.showConfirmDialog (null,"Try again?", "Click Yes of No",JOptionPane.YES_NO_OPTION);//Display window to try againif (answer{JOptionPane. YES_OPTION)==//Reset text fieldsgradeTF.setText("");unitsTF.setText("");// Reset total units and total grade points// Your code here (5 of 5)....totalUnits0;gradePoints0;saved GPACalculator XCompileUndoCutСоpyPasteFind...CloseSource Code|// Your code here (2 of 5)....totalUnits += units;gradePoints += points;|//Reset text fieldsgradeTF.setText("");unitsTF.setText("");catch (NumberFormatException ex){JOptionPane.showMessageDialog(null, "You entered:JOptionPane.INFORMATION_MESSAGE);+ unitsTF.getText(),"Please enter valid\nnumber of units",private class ResetButtonHandler implements ActionListener{public void actionPerformed (ActionEvent e){String msg ="Resetting will delete all entries.\n" +"Are you sure you want to continue?";JOptionPane.showConfirmDialog (null,msg, "Click Yes of No",J0ptionPane. YES_NO_OPTION);int answer|7/Display window to try againif (answer{JOptionPane.YES_OPTION)==|//Reset text fieldsgradeTF.setText("");unitsTF.setText("");II I||// Reset total units and total grade points|// Your code here (3 of 5)..saved

import javax.swing.*;import java.awt.*;import java.awt.event.*;import java.text.DecimalFormat;public…

Step 1 – Make the GPA calculations work Your job is to process the grade and units information when the user clicks the ADD or Reset buttons and to compute the GPA when the user clicks the GPA button. There are five (5) places in the given code for you to add your code. Each of these is commented with a brief description of your task followed by the phrase “Your code here (n of 5)….”. • The variable totalUnits stores the total credits of all classes taken. • The variable gradePoints stores the total grade points earned in those classes taken. For example, if you got a B in a 4 credit hour course, you earn 3.0 x 4 = 12.0 grade points. • The variable totalGPA stores the total GPA, which is simply the total grade points earned divided by the total units taken. For example, if you got an A in a 3 credit course, a C in a 5 credit course, and a B in a 4 credit course, you have (4.0 x 3) + (2.0 x 5) + (3.0 x 4) = 34.0 grade points and 3 + 5 + 4 = 12 total units, so the GPA is 34.0 / 12 = 2.833. Step 2 – Add exception handling You may notice that when you accidentally enter a non-number in the units field, it crashes your program. Instead of crashing add exception handling (using a try-catch block) to catch the problem. The error message tells you which statement causes the exception. Then you can wrap all the code related to that task (updating the points and units running totals) in a try-catch block. Use a JOptionPane.showMessageDialog(…) to report the error.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Step 1 – Make the GPA calculations work Your job is to process the grade and units information when the user clicks the ADD or Reset buttons and to compute the GPA when the user clicks the GPA button. There are five (5) places in the given code for you to add your code. Each of these is commented with a brief description of your task followed by the phrase “Your code here (n of 5)….”. • The variable totalUnits stores the total credits of all classes taken. • The variable gradePoints stores the total grade points earned in those classes taken. For example, if you got a B in a 4 credit hour course, you earn 3.0 x 4 = 12.0 grade points. • The variable totalGPA stores the total GPA, which is simply the total grade points earned divided by the total units taken. For example, if you got an A in a 3 credit course, a C in a 5 credit course, and a B in a 4 credit course, you have (4.0 x 3) + (2.0 x 5) + (3.0 x 4) = 34.0 grade points and 3 + 5 + 4 = 12 total units, so the GPA is 34.0 / 12 = 2.833. Step 2 – Add exception handling You may notice that when you accidentally enter a non-number in the units field, it crashes your program. Instead of crashing add exception handling (using a try-catch block) to catch the problem. The error message tells you which statement causes the exception. Then you can wrap all the code related to that task (updating the points and units running totals) in a try-catch block. Use a JOptionPane.showMessageDialog(…) to report the error.

GPACalculator X
Compile
Undo
Cut
Сopy
Paste
Find...
Close
Source Code
//Show results on message box
JOptionPane.showMessageDialog(null, msg, "Result",
JOptionPane.INFORMATION_MESSAGE);
else
{
|// Compute totalGPA by dividing the total grade points by the total units
|// Your code here (4 of 5)....
totalGPA = gradePoints / totalUnits;
DecimalFormat df = new DecimalFormat("0.000");
String outputStr = "GPA:
+ df.format(totalGPA) + "\n";
//Show results on message box
JOptionPane.showMessageDialog(null, outputStr, "Result",
JOptionPane.INFORMATION_MESSAGE);
int answer = JOptionPane.showConfirmDialog (null,
"Try again?", "Click Yes of No",
JOptionPane.YES_NO_OPTION);
//Display window to try again
if (answer
{
JOptionPane. YES_OPTION)
==
//Reset text fields
gradeTF.setText("");
unitsTF.setText("");
// Reset total units and total grade points
// Your code here (5 of 5)....
totalUnits
0;
gradePoints
0;
saved

GPACalculator X
Compile
Undo
Cut
Соpy
Paste
Find...
Close
Source Code
|// Your code here (2 of 5)....
totalUnits += units;
gradePoints += points;
|//Reset text fields
gradeTF.setText("");
unitsTF.setText("");
catch (NumberFormatException ex)
{
JOptionPane.showMessageDialog(null, "You entered:
JOptionPane.INFORMATION_MESSAGE);
+ unitsTF.getText(),"Please enter valid\nnumber of units",
private class ResetButtonHandler implements ActionListener
{
public void actionPerformed (ActionEvent e)
{
String msg =
"Resetting will delete all entries.\n" +
"Are you sure you want to continue?";
JOptionPane.showConfirmDialog (null,
msg, "Click Yes of No",J0ptionPane. YES_NO_OPTION);
int answer
|7/Display window to try again
if (answer
{
JOptionPane.YES_OPTION)
==
|//Reset text fields
gradeTF.setText("");
unitsTF.setText("");
II I|
|// Reset total units and total grade points
|// Your code here (3 of 5)..
saved

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