Would like to comment/review on the Newton Magazine. Do not know how. Would appreciate your help. Many thanks
Would like to comment/review regarding Newton Magazine and its app. Do not know how. Would appreciate your help. Many thanks.
Wexmall
Hi there,
You may find the article below helpful.
iTunes Store: Writing a review
http://support.apple.com/kb/ht3928
-Griff W
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Hello Trevor
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Post relates to: Zire 31
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This week is my 8thweek of learning java and I am finding it tougher and tougher as the weeks go by. I have been working on this StudentSystem program for about a week now. I have done all I could but I am left with one part which I am finding it tough to handle.
I would appreciate if a good samaritan could add this code for me. I am at my wits end.
The program I am trying to write is supposed to add students with their personal information and then display them in a GUI.
I should be able to select a student and add a grade for that student.
Finally I should be able to get the average for all the grades added for this student and display the average grade.
My challenge is how to obtain all the added scores and show the students average in a new model.
I was thinking of adding a "Get Average" button , which will pop up a new window(Average) displaying the average of all the scores for the Student.
I just can't figure how to link this average display window to the Get Average button.
A student can have any number of grades.
Your help will be very much appreciated
Thanks in advance
Little Delmarie.
THIS IS WHAT I HAVE DONE SO FAR . IT COMPILES nicely in DOS and Visual age
// CODE GradeSystem
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.event.*;
import java.awt.*;
* UsingJLists.java
* This is a sample program for the use of JLists. You can add a student by entering their
* information a clicking on add. You can remove a student by entering their information and
* clicking on remove. They must be in the list to be removed. You can modify a student by
* entering their information and clicking add. You will be asked for the new student
* information when using modify. The add and remove buttons will disappear when modifying
* is underway and the new information is being collected for updating.
* @author Delmarie
public class GradeSystem extends JDialog {
Vector studentGrades = new Vector();
JButton add, modify, remove;
JList theJList;
JPanel buttonPanel, textPanel, labelPanel, masterPanel, jlistPanel, infoPanel;
JTextField score, possibleScore, gradeType;
JLabel label1, label2, label3;
public class ModifyHandler implements ActionListener {
public void actionPerformed(java.awt.event.ActionEvent actionEvent) {
// get the student info from the text boxes
double dScore = 0;
double dPossibleScore = 0;
try {
String str1 = score.getText();
if (str1 != null) dScore = Double.parseDouble(str1);
String str2 = possibleScore.getText();
if (str2 != null) dPossibleScore = Double.parseDouble(str2);
catch(NumberFormatException e) {}
String sGradeType = gradeType.getText();
Grade grade = (Grade)theJList.getSelectedValue();
if (grade == null) {
score.setText("");
possibleScore.setText("");
gradeType.setText("");
return;
grade.setScore(dScore);
grade.setPossibleScore(dPossibleScore);
grade.setGradeType(sGradeType);
theJList.repaint();
public class RemoveHandler implements ActionListener {
public void actionPerformed(java.awt.event.ActionEvent actionEvent) {
int removeIndex = theJList.getSelectedIndex();
if (removeIndex == -1) {
score.setText("");
possibleScore.setText("");
gradeType.setText("");
return;
DefaultListModel model = (DefaultListModel) theJList.getModel();
model.removeElementAt(removeIndex);
studentGrades.removeElementAt(removeIndex);
// clear the textboxes
score.setText("");
possibleScore.setText("");
gradeType.setText("");
public class AddHandler implements ActionListener {
public void actionPerformed(ActionEvent actionEvent) {
// get the student info from the text boxes
double dScore = 0;
double dPossibleScore = 0;
try {
String str1 = score.getText();
if (str1 != null) dScore = Double.parseDouble(str1);
String str2 = possibleScore.getText();
if (str2 != null) dPossibleScore = Double.parseDouble(str2);
catch(NumberFormatException e) {}
String sGradeType = gradeType.getText();
// get the model and add the student to the model
Grade g = new Grade();
g.setScore(dScore);
g.setPossibleScore(dPossibleScore);
g.setGradeType(sGradeType);
studentGrades.add(g);
DefaultListModel model = (DefaultListModel) theJList.getModel();
model.addElement(g);
// display the added element
theJList.setSelectedValue(g, true);
public class WindowHandler extends WindowAdapter {
public void windowClosing(WindowEvent e) {
setVisible(false);
/** Creates a new instance of UsingJLists */
public GradeSystem(JFrame owner, boolean modal) {
super(owner, modal);
// create all of the components, put them in panels, and put the panels in JFrame
add = new JButton("Add");
modify = new JButton("Modify");
remove = new JButton("Remove");
score = new JTextField("");
score.setColumns(10);
possibleScore = new JTextField("");
gradeType = new JTextField("");
label1 = new JLabel("score");
label2 = new JLabel("possibleScore");
label3 = new JLabel("gradeType");
FlowLayout flow = new FlowLayout();
FlowLayout flow1 = new FlowLayout();
FlowLayout flow2 = new FlowLayout();
GridLayout grid1 = new GridLayout(7,1);
GridLayout grid2 = new GridLayout(7,1);
BorderLayout border3 = new BorderLayout();
buttonPanel = new JPanel(flow);
buttonPanel.add(add);
buttonPanel.add(modify);
buttonPanel.add(remove);
labelPanel = new JPanel(grid1);
//labelPanel.setBorder(BorderFactory.createLineBorder(Color.black));
labelPanel.add(Box.createVerticalStrut(20));
labelPanel.add(label1);
labelPanel.add(Box.createVerticalStrut(20));
labelPanel.add(label2);
labelPanel.add(Box.createVerticalStrut(20));
labelPanel.add(label3);
labelPanel.add(Box.createVerticalStrut(20));
textPanel = new JPanel(grid2);
//textPanel.setBorder(BorderFactory.createLineBorder(Color.black));
textPanel.add(Box.createVerticalStrut(20));
textPanel.add(score);
textPanel.add(Box.createVerticalStrut(20));
textPanel.add(possibleScore);
textPanel.add(Box.createVerticalStrut(20));
textPanel.add(gradeType);
textPanel.add(Box.createVerticalStrut(20));
infoPanel = new JPanel(new FlowLayout());
infoPanel.setBorder(BorderFactory.createTitledBorder("Grade Information"));
infoPanel.add(Box.createHorizontalStrut(10));
infoPanel.add(textPanel);
infoPanel.add(Box.createHorizontalStrut(10));
infoPanel.add(labelPanel);
infoPanel.add(Box.createHorizontalStrut(10));
theJList = new JList(new DefaultListModel());
theJList.addListSelectionListener(new javax.swing.event.ListSelectionListener(){
public void valueChanged(ListSelectionEvent evt) {
Grade grade = (Grade)theJList.getSelectedValue();
if (grade == null) {
score.setText("");
possibleScore.setText("");
gradeType.setText("");
return;
score.setText(Double.toString(grade.getScore()));
possibleScore.setText(Double.toString(grade.getPossibleScore()));
gradeType.setText(grade.getGradeType());
//JLabel theLabel = new JLabel("Students");
jlistPanel = new JPanel(border3);
jlistPanel.setBorder(BorderFactory.createTitledBorder("List of Scores"));
jlistPanel.add(new JScrollPane(theJList));//, BorderLayout.SOUTH);
masterPanel = new JPanel(new GridLayout(1, 2));
masterPanel.setBorder(BorderFactory.createLineBorder(Color.black));
// masterPanel.add(Box.createHorizontalStrut(10));
masterPanel.add(infoPanel);
// masterPanel.add(Box.createHorizontalStrut(10));
masterPanel.add(jlistPanel);
// masterPanel.add(Box.createHorizontalStrut(10));
BorderLayout border = new BorderLayout();
this.getContentPane().setLayout(border);
Container theContainer = this.getContentPane();
theContainer.add(buttonPanel,BorderLayout.SOUTH);
theContainer.add(masterPanel, BorderLayout.CENTER);
// now add the event handlers for the buttons
AddHandler handleAdd = new AddHandler();
ModifyHandler handleModify = new ModifyHandler();
RemoveHandler handleRemove = new RemoveHandler();
add.addActionListener(handleAdd);
modify.addActionListener(handleModify);
remove.addActionListener(handleRemove);
// add the event handler for the window events
WindowHandler handleWindow = new WindowHandler();
this.addWindowListener(handleWindow);
setSize(600,300);
* Insert the method's description here.
* Creation date: (2/24/03 4:20:07 PM)
* @param v com.sun.java.util.collections.Vector
public void setStudentGrades(Vector v) {
studentGrades = v;
DefaultListModel model = (DefaultListModel) theJList.getModel();
model.removeAllElements();
int size = v.size();
for (int i = 0; i < size; i++) {
model.addElement(v.get(i));
score.setText("");
possibleScore.setText("");
gradeType.setText("");
setVisible(true);
// CODE2 StudentSystem
import javax.swing.*;
import javax.swing.event.*;
import java.awt.event.*;
import java.awt.*;
* UsingJLists.java
* This is a sample program for the use of JLists. You can add a student by entering their
* information a clicking on add. You can remove a student by entering their information and
* clicking on remove. They must be in the list to be removed. You can modify a student by
* entering their information and clicking add. You will be asked for the new student
* information when using modify. The add and remove buttons will disappear when modifying
* is underway and the new information is being collected for updating.
* @author Delmarie
public class StudentSystem extends JFrame {
StudentGradeBook studentGradeBook = new StudentGradeBook();
GradeSystem gradeSystem = new GradeSystem(this, true);
JButton add, modify, remove, bGrade;
JList theJList;
JPanel buttonPanel, textPanel, labelPanel, masterPanel, jlistPanel, infoPanel;
JTextField name, address, email, phone, courseName, courseDescription;
JLabel label1, label2, label3;
StudentSystem tempObjectRef; // used to hold a class level reference to object for dispose
boolean getStudentInfo = false;
int saveIndexInObject;
public class ModifyHandler implements ActionListener {
public void actionPerformed(java.awt.event.ActionEvent actionEvent) {
// get the information for the student to modify
String studentName = name.getText();
String studentAddress = address.getText();
String studentEmail = email.getText();
if (!getStudentInfo) { // set up to get student info
// find the correct element of the model to remove and save in class variable
int removeIndex = -1;
DefaultListModel model = (DefaultListModel) theJList.getModel();
for (int i = 0; i < model.size(); i++) {
String temp = (String) model.elementAt(i);
if (temp.equals(name.getText())) {
removeIndex = i;
break;
saveIndexInObject = removeIndex;
if (removeIndex == -1) return;
// change the text on the border of the info box
infoPanel.setBorder(BorderFactory.createTitledBorder("Enter new Student Info"));
// set up to get the modified info and remove some of the buttons
getStudentInfo = true;
buttonPanel.removeAll();
buttonPanel.add(modify);
buttonPanel.add(bGrade);
buttonPanel.repaint();
else {
// reset the border and change the element at the provided index (from if above)
getStudentInfo = false;
infoPanel.setBorder(BorderFactory.createTitledBorder("Student Information"));
DefaultListModel model = (DefaultListModel) theJList.getModel();
model.setElementAt(name.getText(), saveIndexInObject);
Student student = studentGradeBook.findStudent(saveIndexInObject);
student.setName(name.getText());
student.setAddress(address.getText());
student.setEmail(email.getText());
student.setPhone(phone.getText());
student.setCourseName(courseName.getText());
student.setCourseDescription(courseDescription.getText());
// clear the textboxes
name.setText("");
address.setText("");
email.setText("");
phone.setText("");
courseName.setText("");
courseDescription.setText("");
// restore all of the buttons
buttonPanel.removeAll();
buttonPanel.add(add);
buttonPanel.add(modify);
buttonPanel.add(remove);
buttonPanel.add(bGrade);
buttonPanel.repaint();
public class RemoveHandler implements ActionListener {
public void actionPerformed(java.awt.event.ActionEvent actionEvent) {
// get the student info from the text boxes
String studentName = name.getText();
String studentAddress = address.getText();
String studentEmail = email.getText();
// find the element to remove by name (you could use email address etc also)
int removeIndex = -1; // = theJList.getSelectedIndex();
DefaultListModel model = (DefaultListModel) theJList.getModel();
for (int i = 0; i < model.size(); i++) {
String temp = (String) model.elementAt(i);
if (temp.equals(name.getText())) {
removeIndex = i;
break;
if (removeIndex == -1) return;
// remove the element at the index from the for loop
model.removeElementAt(removeIndex);
Student student = studentGradeBook.findStudent(removeIndex);
studentGradeBook.removeStudent(student);
// clear the textboxes
name.setText("");
address.setText("");
email.setText("");
phone.setText("");
courseName.setText("");
courseDescription.setText("");
public class AddHandler implements ActionListener {
public void actionPerformed(java.awt.event.ActionEvent actionEvent) {
// get the student info from the text boxes
String studentName = name.getText();
String studentAddress = address.getText();
String studentEmail = email.getText();
String studentPhone = phone.getText();
String studentCourseName = courseName.getText();
String studentCourseDescription = courseDescription.getText();
// get the model and add the student to the model
studentGradeBook.addStudent(studentName, studentAddress, studentEmail, studentPhone,
studentCourseName, studentCourseDescription);
DefaultListModel model = (DefaultListModel) theJList.getModel();
model.addElement(studentName);
// reset the text boxes
name.setText("");
address.setText("");
email.setText("");
phone.setText("");
courseName.setText("");
courseDescription.setText("");
public class WindowHandler extends WindowAdapter {
public void windowClosing(WindowEvent e) {
gradeSystem.dispose();
tempObjectRef.dispose();
System.exit(0);
/** Creates a new instance of UsingJLists */
public StudentSystem() {
// create all of the components, put them in panels, and put the panels in JFrame
add = new JButton("Add");
modify = new JButton("Modify");
remove = new JButton("Remove");
bGrade = new JButton("Grades");
name = new JTextField("");
name.setColumns(10);
address = new JTextField("");
email = new JTextField("");
phone = new JTextField("");
courseName = new JTextField("");
courseDescription = new JTextField("");
label1 = new JLabel("name");
label2 = new JLabel("address");
label3 = new JLabel("email");
JLabel label4 = new JLabel("phone");
JLabel label5 = new JLabel("courseName");
JLabel label6 = new JLabel("courseDescription");
FlowLayout flow = new FlowLayout();
FlowLayout flow1 = new FlowLayout();
FlowLayout flow2 = new FlowLayout();
GridLayout grid1 = new GridLayout(13,1);
GridLayout grid2 = new GridLayout(13,1);
BorderLayout border3 = new BorderLayout();
buttonPanel = new JPanel(flow);
buttonPanel.add(add);
buttonPanel.add(modify);
buttonPanel.add(remove);
buttonPanel.add(bGrade);
bGrade.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
int index = theJList.getSelectedIndex();
if (index == -1) return;
Student student = studentGradeBook.findStudent(index);
gradeSystem.setStudentGrades(student.getStudentGrades());
labelPanel = new JPanel(grid1);
//labelPanel.setBorder(BorderFactory.createLineBorder(Color.black));
labelPanel.add(Box.createVerticalStrut(20));
labelPanel.add(label1);
labelPanel.add(Box.createVerticalStrut(20));
labelPanel.add(label2);
labelPanel.add(Box.createVerticalStrut(20));
labelPanel.add(label3);
labelPanel.add(Box.createVerticalStrut(20));
labelPanel.add(label4);
labelPanel.add(Box.createVerticalStrut(20));
labelPanel.add(label5);
labelPanel.add(Box.createVerticalStrut(20));
labelPanel.add(label6);
labelPanel.add(Box.createVerticalStrut(20));
textPanel = new JPanel(grid2);
//textPanel.setBorder(BorderFactory.createLineBorder(Color.black));
textPanel.add(Box.createVerticalStrut(20));
textPanel.add(name);
textPanel.add(Box.createVerticalStrut(20));
textPanel.add(address);
textPanel.add(Box.createVerticalStrut(20));
textPanel.add(email);
textPanel.add(Box.createVerticalStrut(20));
textPanel.add(phone);
textPanel.add(Box.createVerticalStrut(20));
textPanel.add(courseName);
textPanel.add(Box.createVerticalStrut(20));
textPanel.add(courseDescription);
textPanel.add(Box.createVerticalStrut(20));
infoPanel = new JPanel(new FlowLayout());
infoPanel.setBorder(BorderFactory.createTitledBorder("Student Information"));
infoPanel.add(Box.createHorizontalStrut(10));
infoPanel.add(textPanel);
infoPanel.add(Box.createHorizontalStrut(10));
infoPanel.add(labelPanel);
infoPanel.add(Box.createHorizontalStrut(10));
theJList = new JList(new DefaultListModel());
theJList.addListSelectionListener(new javax.swing.event.ListSelectionListener(){
public void valueChanged(ListSelectionEvent evt) {
int index = theJList.getSelectedIndex();
if (index == -1) return;
Student student = studentGradeBook.findStudent(index);
name.setText(student.getName());
address.setText(student.getAddress());
email.setText(student.getEmail());
phone.setText(student.getPhone());
courseName.setText(student.getCourseName());
courseDescription.setText(student.getCourseDescription());
//JLabel theLabel = new JLabel("Students");
jlistPanel = new JPanel(border3);
jlistPanel.setBorder(BorderFactory.createTitledBorder("List of Students"));
jlistPanel.add(new JScrollPane(theJList), BorderLayout.SOUTH);
masterPanel = new JPanel(flow1);
masterPanel.setBorder(BorderFactory.createLineBorder(Color.black));
masterPanel.add(Box.createHorizontalStrut(10));
masterPanel.add(infoPanel);
masterPanel.add(Box.createHorizontalStrut(10));
masterPanel.add(jlistPanel);
masterPanel.add(Box.createHorizontalStrut(10));
BorderLayout border = new BorderLayout();
this.getContentPane().setLayout(border);
Container theContainer = this.getContentPane();
theContainer.add(buttonPanel,BorderLayout.SOUTH);
theContainer.add(masterPanel, BorderLayout.NORTH);
// now add the event handlers for the buttons
AddHandler handleAdd = new AddHandler();
ModifyHandler handleModify = new ModifyHandler();
RemoveHandler handleRemove = new RemoveHandler();
add.addActionListener(handleAdd);
modify.addActionListener(handleModify);
remove.addActionListener(handleRemove);
// add the event handler for the window events
WindowHandler handleWindow = new WindowHandler();
this.addWindowListener(handleWindow);
// make the frame visible and set its size and show it.
this.setVisible(true);
this.pack();//setSize(600,300);
this.show();
public static void main (String [] args) {
StudentSystem mainObject = new StudentSystem();
mainObject.setTempObjectRef(mainObject);
public void setTempObjectRef(StudentSystem obj) {
// set up a reference to this object for use in closing the window method dispose
tempObjectRef = obj;
// CODE 3 Student
import java.util.*;
* Insert the type's description here.
* Creation date: (2/24/03 11:23:58 AM)
* @author: Delmarie
public class Student {
private String name, address, phone, email, courseName, courseDescription;
private Vector studentGrades;
* Student constructor comment.
public Student() {
studentGrades = new Vector();
* Insert the method's description here.
* Creation date: (2/24/03 11:39:56 AM)
* @param score double
* @param possibleScore double
* @param gradeType java.lang.String
public void addGrade(double score, double possibleScore, String gradeType) {
Grade g = new Grade();
g.setScore(score);
g.setPossibleScore(possibleScore);
g.setGradeType(gradeType);
studentGrades.add(g);
* Insert the method's description here.
* Creation date: (2/24/03 11:47:01 AM)
* @return Grade
* @param index int
public Grade findGrade(int index) {
return (Grade)studentGrades.get(index);
* Insert the method's description here.
* Creation date: (2/24/03 11:28:57 AM)
* @return java.lang.String
public java.lang.String getAddress() {
return address;
* Insert the method's description here.
* Creation date: (2/24/03 11:28:57 AM)
* @return java.lang.String
public java.lang.String getCourseDescription() {
return courseDescription;
* Insert the method's description here.
* Creation date: (2/24/03 11:28:57 AM)
* @return java.lang.String
public java.lang.String getCourseName() {
return courseName;
* Insert the method's description here.
* Creation date: (2/24/03 11:28:57 AM)
* @return java.lang.String
public java.lang.String getEmail() {
return email;
* Insert the method's description here.
* Creation date: (2/24/03 11:48:03 AM)
* @return java.util.Iterator
public Iterator getGradeIterator() {
return studentGrades.iterator();
* Insert the method's description here.
* Creation date: (2/24/03 11:28:57 AM)
* @return java.lang.String
public java.lang.String getName() {
return name;
* Insert the method's description here.
* Creation date: (2/24/03 11:28:57 AM)
* @return java.lang.String
public java.lang.String getPhone() {
return phone;
* Insert the method's description here.
* Creation date: (2/25/03 10:56:13 AM)
* @return java.util.Vector
public java.util.Vector getStudentGrades() {
return studentGrades;
* Insert the method's description here.
* Creation date: (2/24/03 11:41:52 AM)
* @param grade Grade
public void removeGrade(Grade grade) {
studentGrades.remove(grade);
* Insert the method's description here.
* Creation date: (2/24/03 11:28:57 AM)
* @param newAddress java.lang.String
public void setAddress(java.lang.String newAddress) {
address = newAddress;
* Insert the method's description here.
* Creation date: (2/24/03 11:28:57 AM)
* @param newCourseDescription java.lang.String
public void setCourseDescription(java.lang.String newCourseDescription) {
courseDescription = newCourseDescription;
* Insert the method's description here.
* Creation date: (2/24/03 11:28:57 AM)
* @param newCourseName java.lang.String
public void setCourseName(java.lang.String newCourseName) {
courseName = newCourseName;
* Insert the method's description here.
* Creation date: (2/24/03 11:28:57 AM)
* @param newEmail java.lang.String
public void setEmail(java.lang.String newEmail) {
email = newEmail;
* Insert the method's description here.
* Creation date: (2/24/03 11:28:57 AM)
* @param newName java.lang.String
public void setName(java.lang.String newName) {
name = newName;
* Insert the method's description here.
* Creation date: (2/24/03 11:28:57 AM)
* @param newPhone java.lang.String
public void setPhone(java.lang.String newPhone) {
phone = newPhone;
* Insert the method's description here.
* Creation date: (2/25/03 10:56:13 AM)
* @param newStudentGrades java.util.Vector
public void setStudentGrades(Vector newStudentGrades) {
studentGrades = newStudentGrades;
//CODE 4 StudentGradeBook
import java.util.*;
* Insert the type's description here.
* Creation date: (2/24/03 11:50:35 AM)
* @author: delmarie
public class StudentGradeBook {
private Vector allStudents;
* StudentGradeBook constructor comment.
public StudentGradeBook() {
allStudents = new Vector();
* Insert the method's description here.
* Creation date: (2/24/03 11:54:01 AM)
* @param name java.lang.String
* @param address java.lang.String
* @param email java.lang.String
* @param phone java.lang.String
public void addStudent(String name, String address, String email, String phone) {
Student student = new Student();
student.setName(name);
student.setAddress(address);
student.setEmail(email);
student.setPhone(phone);
allStudents.add(student);
* Insert the method's description here.
* Creation date: (2/24/03 11:54:01 AM)
* @param name java.lang.String
* @param address java.lang.String
* @param email java.lang.String
* @param phone java.lang.String
public void addStudent(String name, String address, String email, String phone,
String courseName, String courseDescription) {
Student student = new Student();
student.setName(name);
student.setAddress(address);
student.setEmail(email);
student.setPhone(phone);
student.setCourseName(courseName);
student.setCourseDescription(courseDescription);
allStudents.add(student);
* Insert the method's description here.
* Creation date: (2/24/03 12:00:53 PM)
* @param index Student
public Student findStudent(int index) {
return (Student)allStudents.get(index);
* Insert the method's description here.
* Creation date: (2/24/03 12:02:43 PM)
* @return java.util.Iterator
public Iterator getStudentIterator() {
return allStudents.iterator();
* Insert the method's description here.
* Creation date: (2/24/03 11:59:41 AM)
* @paFirst of all, this is an extremely advanced project for someone only having 8 weeks of experience. I'm not sure what the "real story" (e.g., the professor teaching the course majored in Public Speaking, student told counselor that she could handle skipping the preliminary course, student transferring from college that used another language as the core language) is but I'll give you my 2 cents anyway.
Suggestions:
I personally would start over keeping the following in mind.
1.) Write a student class that encapsulates/holds the student's personal information, history of grades, computes average and whatever eles is needed from the student.
--the history of grades can be stored in any list structure, preferably some sort of array, since all you going to do with them is average them.
2.) Keep your window display as simple as possible. Basically from my understanding you'll need at a minimum:
JTextField First_Name, Last_Name, Street_Address, City, State, Zip, Average_Grade;
You can either have labels for these or fill them in with their respective labels if they are empty.
JButton New, Average, Add
I don't know the components name, but I'm sure Java has some sort of drop down list that you will need so you can add students' names to it as they are added.
The following is a scenario of how this will come together, initially assuming there are no students:
Your program starts with all the JTextFields containing their repsective labels and grayed out, it's an option or method in JTextField. The drop down list is empty. The teacher has to press the New button, at which time the grayed out text fields become editable. Teacher completes filling out the form and presses the Add button. At this point, your program gathers the information from the text fields (First_Name, Last_Name...) and instantiates or creates a new Student object from your Student class and adds the student name to the drop down list. Now that the new Student object has been created and constructed, you need to store it in you lists structure for later retrieval or writing to disk later.
Now there is a student in the database. So the teacher comes along and wants to average Davey's grades. The teacher goes to the dropdown list and selects Davey's name, which triggers an event in you program. You retrieve the name of the student from your window's drop down list, pull the Student record from your list structure, ask it for the average grade and populate the other text fields in your window with the records information (First_Name, Last_Name, Address...). The Average_Grade text field is made editable and the value of getAverage from the Student object is inserted. The chain of envents keep rolling much in the same manner.
If you made it this far and much of what I said is confusing, then I believe you are in over your head and I'm sorry. If much of what I said sounds similar to what you have or at least you understand a majority of what I said, then let me comment on where you started going awry.
Regarding this project, I believe you envisioned each chain of events spawning a new window, such as user clicks the New button so your program would spawn a new window titled "Enter new Student Information."
You can represent all the task and modes required in this project using a single window display by manipulating the components within the window. If you are looking at a window and suddenly a text box is grayed out, the program is sending a signal to you that its mode has changed.
I hope this helps and good luck. -
Hi, I am looking for assistance on how to reset the passcode on my ipad. It is asking for a passcode & then I enter what I thought it was and it doesn't accept & disables the ipad for 15 mins. Any guidance would be greatly appreciated ast the call centre is currently closed. Thanks Peter
If You Are Locked Out, Have Forgotten Your Passcode, or Just Need to Restore Your Device
1. iTunes 10 for Mac- Update and restore software on iPod, iPhone, or iPad
2. iPhone, iPad, iPod touch: Wrong passcode results in red disabled screen
3. iOS- Understanding passcodes
4. What to Do If You've Forgotten Your iPhone's Passcode
5. How to Recover Forgotten iPhone Restrictions Passcode | The iPhone and iPad
If you have forgotten your Restrictions code, then follow the instructions
below but DO NOT restore any previous backup. If you do then you will
simply be restoring the old Restrictions code you have forgotten. This
same warning applies if you need to restore a clean system.
A Complete Guide to Restore or Recover Your iDevice (if You Forget Your Passcode)
If you need to restore your device or ff you cannot remember the passcode, then you will need to restore your device using the computer with which you last synced it. This allows you to reset your passcode and re-sync the data from the device (or restore from a backup). If you restore on a different computer that was never synced with the device, you will be able to unlock the device for use and remove the passcode, but your data will not be present. Refer to Updating and restoring iPhone, iPad and iPod touch software.
Try restoring the iOS device if backing up and erasing all content and settings doesn't resolve the issue. Using iTunes to restore iOS devices is part of standard isolation troubleshooting. Restoring your device will delete all data and content, including songs, videos, contacts, photos, and calendar information, and will restore all settings to their factory condition.
Before restoring your iOS device, Apple recommends that you either sync with iTunes to transfer any purchases you have made, or back up new data (data acquired after your last sync). If you have movie rentals on the device, see iTunes Store movie rental usage rights in the United States before restoring.
Follow these steps to restore your device:
1. Verify that you are using the latest version of iTunes before attempting to update.
2. Connect your device to your computer.
3. Select your iPhone, iPad, or iPod touch when it appears in iTunes under Devices.
4. Select the Summary tab.
5. Select the Restore option.
6. When prompted to back up your settings before restoring, select the
Back Up option. If you have just backed up the device, it is not necessary
to create another.
7. Select the Restore option when iTunes prompts you (as long as you've backed up,
you should not have to worry about restoring your iOS device).
8. When the restore process has completed, the device restarts and displays the Apple
logo while starting up:
After a restore, the iOS device displays the "Connect to iTunes" screen. For updating
to iOS 5 or later, follow the steps in the iOS Setup Assistant. For earlier versions of
iOS, keep your device connected until the "Connect to iTunes" screen goes away or
you see "iPhone is activated."
9. The final step is to restore your device from a previous backup. If you do not have a
backup to restore or have forgotten your restrictions passcode, then restore as New.
If you are restoring to fix a forgotten Restrictions Code or as a New device, then skip Step 9 and restore as New. -
SUddenly, when typing text on my IPad, full stops followed by a capital letter. Keep occurring. Also when I tap the back erase. Arrow, everything that I have previously. Typed gets erased. Would love some help with this, have looked in settings but none the wiser. Thanks.
Do yo have the "." shortcut set to On? (Settings>General>Keyboard). If you do, it may be that you are hitting the space bar twice without realizing it. This will insert a period.
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