JAVA questions: 1. Suppose that you are writing a class named Student. It has th

ID: 3766504 • Letter: J

Question

JAVA questions:

1. Suppose that you are writing a class named Student. It has three private attributes: int id; String name; and double gpa; Write a constructor with three arguments for this Student class.

2. For same Student class in Problem 1, write set and get method for attribute gpa.

3. For same Student class in Problem1, write one line of code to create a Student object named student1. Student1’s name is “John Doe”; id is 1234; and gpa is 3.92

4. Write one line of code to display a message “Thank You!”. You must use method in JOptionPane class to do so.

5. Write one line of code to make the JTextFiled displayField cannot be typed in.

6. For same Student class in Problem 1, override equals method inherited from Object class. Two Student objects are equal if they have the same id.

7. Suppose that you have a class Employee, which has three private attributes: String id; String name; and String address; Suppose class HourlyEmployee is a child class of Employee. HourlyEmployee has an attribute double wage;

a. Write the header of HourlyEmployee class.

b. Write necessary mutator and accessor methods for HourlyEmployee class

Explanation / Answer

/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/

package problem1;

/**
*
* @author TANAY
*/
public class Student extends javax.swing.JFrame {

private
int id;
String name;
double gpa;

public
Student(int i, String s, double g)
{
id=i;
name=s;
gpa=g;
initComponents();
}
void set(double g)
{
gpa=g;
}
double get()
{
return gpa;
}

/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {

jOptionPane1 = new javax.swing.JOptionPane();
jTextField1 = new javax.swing.JTextField();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
addFocusListener(new java.awt.event.FocusAdapter() {
public void focusGained(java.awt.event.FocusEvent evt) {
form_load(evt);
}
});

jTextField1.setText("jTextField1");

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(123, 123, 123)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(218, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(137, 137, 137)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(143, Short.MAX_VALUE))
);

pack();
}// </editor-fold>

private void form_load(java.awt.event.FocusEvent evt) {
// TODO add your handling code here:
jOptionPane1.showMessageDialog(null, "Thank you");
jTextField1.disable();

}

/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(Student.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Student.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Student.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Student.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>

/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
Student student1 = new Student(1234,"John Doe",3.92);
student1.setVisible(true);
}
});
}

// Variables declaration - do not modify
private javax.swing.JOptionPane jOptionPane1;
private javax.swing.JTextField jTextField1;
// End of variables declaration
}

/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/

package problem1;

/**
*
* @author TANAY
*/
public class Employee extends javax.swing.JFrame {

/**
* Creates new form Employee
*/
private
String id;
String name;
String address;
public Employee() {
initComponents();
}

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 300, Short.MAX_VALUE)
);

pack();
}// </editor-fold>

/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(Employee.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Employee.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Employee.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Employee.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>

/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Employee().setVisible(true);
}
});
}

// Variables declaration - do not modify
// End of variables declaration
}
class HourlyEmployee extends Employee
{
double wage;
}

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JAVA questions: 1. Suppose that you are writing a class named Student. It has th

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