Notes

Fig: 8.7
##Date
public class Date {

private int month;
private int day;
private int year;

private static final int[] daysPerMonth = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

public Date(int month, int day, int year) {
if (month <= 0 || month > 12) {
throw new IllegalArgumentException("month (" + month + ") must be 1-12");
}

if (day <= 0 || (day > daysPerMonth[month] && !(month == 2 && day == 29))) {
throw new IllegalArgumentException("day (" + day + ") out-of-range for the specified month and year");
}

if (month == 2 && day == 29 && !(year % 400 == 0 || (year % 4 == 0 && year % 100 != 0))) {
throw new IllegalArgumentException("day (" + day + ") out-of-range for the specified month and year");
}

this.month = month;
this.day = day;
this.year = year;
System.out.printf("Date object constructor for date %s%n", this);
}

public String toString() {

return String.format("%d/%d/%d", month, day, year);
}
}



Fig:8.8
##Employee
public class Employee
{
private String firstName;
private String lastName;
private Date birthDate;
private Date hireDate;

public Employee(String firstName, String lastName, Date birthDate, Date hireDate)
{
this.firstName = firstName;
this.lastName = lastName;
this.birthDate = birthDate;
this.hireDate = hireDate;
}

public String toString() {
return String.format("%s, %s Hired: %s Birthday: %s", lastName, firstName, hireDate, birthDate);

}
}



Fig:8.9
##EmployeeTest
public class EmployeeTest {

public static void main(String[] args)
{
Date birth = new Date(7, 24, 1949);
Date hire = new Date(3, 12, 1988);
Employee employee = new Employee("Bob", "Blue", birth, hire);

System.out.println(employee);
}
}



Fig:9.4
##CommissionEmployee extends Object
public class CommissionEmployee extends Object {

private final String firstName;
private final String lastName;
private final String socialSecurityNumber;
private double grossSales;
private double commissionRate;

public CommissionEmployee(String firstName, String lastName,
String socialSecurityNumber, double grossSales,
double commissionRate) {
if (grossSales < 0.0) {
throw new IllegalArgumentException("Gross sales must be >= 0.0");
}

if (commissionRate <= 0.0 || commissionRate >= 1.0) {
throw new IllegalArgumentException("Commission rate must be > 0.0 and < 1.0");
}

this.firstName = firstName;
this.lastName = lastName;
this.socialSecurityNumber = socialSecurityNumber;
this.grossSales = grossSales;
this.commissionRate = commissionRate;
}

public String getFirstName() {
return firstName;
}

public String getLastName() {
return lastName;
}

public String getSocialSecurityNumber() {
return socialSecurityNumber;
}

public void setGrossSales(double grossSales) {
if (grossSales < 0.0) {
throw new IllegalArgumentException("Gross sales must be >= 0.0");
}

this.grossSales = grossSales;
}

public double getGrossSales() {
return grossSales;
}

public void setCommissionRate(double commissionRate) {
if (commissionRate <= 0.0 || commissionRate >= 1.0) {
throw new IllegalArgumentException("Commission rate must be > 0.0 and < 1.0");
}

this.commissionRate = commissionRate;
}

public double getCommissionRate() {
return commissionRate;
}

public double earnings() {
return commissionRate * grossSales;
}

@Override
public String toString()
{
return String.format("%s: %s %s%n%s: %s%n%s: %.2f%n%s: %.2f",
"commission employee", firstName, lastName,
"social security number", socialSecurityNumber,
"gross sales", grossSales,
"commission rate", commissionRate);

}
}



Fig:9.5
##CommissionEmployeeTest
public class CommissionEmployeeTest {

public static void main(String[] args) {
CommissionEmployee employee = new CommissionEmployee(
"Sue", "Jones", "222-22-2222", 10000, .06);
System.out.println("Employee information obtained by get methods:");
System.out.printf("%n%s %s%n", "First name is", employee.getFirstName());
System.out.printf("%s %s%n", "Last name is", employee.getLastName());
System.out.printf("%s %s%n", "Social security number is", employee.getSocialSecurityNumber());
System.out.printf("%s %.2f%n", "Gross sales is", employee.getGrossSales());
System.out.printf("%s %.2f%n", "Commission rate is", employee.getCommissionRate());

employee.setGrossSales(5000);
employee.setCommissionRate(.1);

System.out.printf("%n%s:%n%n %n",
"Updated employee information obtained by toString", employee);
}
}



Fig:9.6
##BasePlusCommissionEmployee
public class BasePlusCommissionEmployee
{
private final String firstName;
private final String lastName;
private final String socialSecurityNumber;
private double grossSales;
private double commissionRate;
private double baseSalary;

public BasePlusCommissionEmployee(String firstName, String lastName,String socialSecurityNumber, double grossSales,
double commissionRate, double baseSalary)
{

if (grossSales < 0.0)
throw new IllegalArgumentException(
"Gross sales must be >= 0.0");

if (commissionRate <= 0.0 || commissionRate >= 1.0)
throw new IllegalArgumentException(
"Commission rate must be > 0.0 and < 1.0");

if (baseSalary < 0.0)
throw new IllegalArgumentException(
"Base salary must be >= 0.0");

this.firstName = firstName;
this.lastName = lastName;
this.socialSecurityNumber = socialSecurityNumber;
this.grossSales = grossSales;
this.commissionRate = commissionRate;
this.baseSalary = baseSalary;
}
public String getFirstName() {
return firstName;
}

public String getLastName() {
return lastName;
}

public String getSocialSecurityNumber() {
return socialSecurityNumber;
}

public void setGrossSales(double grossSales) {
if (grossSales < 0.0)
throw new IllegalArgumentException("Gross sales must be >= 0.0");

this.grossSales = grossSales;
}

public double getGrossSales() {
return grossSales;
}

public void setCommissionRate(double commissionRate) {
if (commissionRate <= 0.0 || commissionRate >= 1.0)
throw new IllegalArgumentException("Commission rate must be > 0.0 and < 1.0");

this.commissionRate = commissionRate;
}
public double getCommissionRate() {
return commissionRate;
}

public void setBaseSalary(double baseSalary) {
if (baseSalary < 0.0)
throw new IllegalArgumentException(
"Base salary must be >= 0.0");

this.baseSalary = baseSalary;
}

public double getBaseSalary() {
return baseSalary;
}

public double earnings() {
return getBaseSalary() + (commissionRate * grossSales);
}

@Override
public String toString() {
return String.format(
"%s: %s %s%n%s: %s%n%s: %.2f%n%s: %.2f%n%s: %.2f",
"base-salaried commission employee", firstName, lastName,
"social security number", socialSecurityNumber,
"gross sales", grossSales, "commission rate", commissionRate,
"base salary", baseSalary);
}
}



Fig:9.7
##BasePlusCommissionEmployeeTest
public class BasePlusCommissionEmployeeTest {

public static void main(String[] args) {
BasePlusCommissionEmployee employee
= new BasePlusCommissionEmployee("Bob", "Lewis", "333-33-3333", 5000, .04, 300);
System.out.println("Employee information obtained by get methods:%n");
System.out.printf("%s %s%n", "First name is",
employee.getFirstName());
System.out.printf("%s %s%n", "Last name is",
employee.getLastName());
System.out.printf("%s %s%n", "Social security number is",
employee.getSocialSecurityNumber());
System.out.printf("%s %.2f%n", "Gross sales is",
employee.getGrossSales());
System.out.printf("%s %.2f%n", "Commission rate is",
employee.getCommissionRate());
System.out.printf("%s %.2f%n", "Base salary is",
employee.getBaseSalary());

employee.setBaseSalary(1000);
System.out.printf("%n%s:%n%n%s%n",
"Updated employee information obtained by toString",
employee.toString());
}
}




Fig:9.8
##BasePlusCommissionEmployee extends CommissionEmployee
public class BasePlusCommissionEmployee extends CommissionEmployee
{
private double baseSalary;

public BasePlusCommissionEmployee(String firstName, String lastName, String socialSecurityNumber, double grossSales, double commissionRate, double baseSalary) {
super(firstName, lastName, socialSecurityNumber, grossSales, commissionRate);
if (baseSalary < 0.0)
throw new IllegalArgumentException("Base salary must be >= 0.0");
this.baseSalary = baseSalary;
}
public void setBaseSalary(double baseSalary) {
if (baseSalary < 0.0) {
throw new IllegalArgumentException(
"Base salary must be >= 0.0");
}
this.baseSalary = baseSalary;
}

public double getBaseSalary() {
return baseSalary;
}

@Override
public double earnings() {
return baseSalary + (commissionRate * grossSales);
}

@Override
public String toString()
{
return String.format(
"%s: %s %s%n%s: %s%n%s: %.2f%n%s: %.2f%n%s: %.2f",
"base-salaried commission employee", firstName, lastName,
"social security number", socialSecurityNumber,
"gross sales", grossSales, "commission rate", commissionRate,
"base salary", baseSalary);
}
}



Fig: 910
##CommissionEmployee
public class CommissionEmployee
{
private final String firstName;
private final String lastName;
private final String socialSecurityNumber;
private double grossSales;
private double commissionRate;
public CommissionEmployee(String firstName, String lastName,
String socialSecurityNumber, double grossSales,
double commissionRate) {
if (grossSales < 0.0)
throw new IllegalArgumentException(
"Gross sales must be >= 0.0");
if (commissionRate <= 0.0 || commissionRate >= 1.0)
throw new IllegalArgumentException(
"Commission rate must be > 0.0 and < 1.0");
this.firstName = firstName;
this.lastName = lastName;
this.socialSecurityNumber = socialSecurityNumber;
this.grossSales = grossSales;
this.commissionRate = commissionRate;
}

public String getFirstName() {
return firstName;
}

public String getLastName() {
return lastName;
}

public String getSocialSecurityNumber() {
return socialSecurityNumber;
}

public void setGrossSales(double grossSales) {
if (grossSales < 0.0)
throw new IllegalArgumentException(
"Gross sales must be >= 0.0");
this.grossSales = grossSales;
public double getGrossSales() {
return grossSales;
}

public void setCommissionRate(double commissionRate) {
if (commissionRate <= 0.0 || commissionRate >= 1.0)
throw new IllegalArgumentException("Commission rate must be > 0.0 and < 1.0");

this.commissionRate = commissionRate;
}

public double getCommissionRate() {
return commissionRate;
}

public double earnings() {
return getCommissionRate() * getGrossSales();
}

@Override
public String toString()
{
return String.format("%s: %s %s%n%s: %s%n%s: %.2f%n%s: %.2f", "commission employee", getFirstName(), getLastName(),
"social security number", getSocialSecurityNumber(),
"gross sales", getGrossSales(),
"commission rate", getCommissionRate());
}
}
}




Fig:9.11
##BasePlusCommissionEmployee extends CommissionEmployee
public class BasePlusCommissionEmployee extends CommissionEmployee {
private double baseSalary;

public BasePlusCommissionEmployee(String firstName, String lastName,
String socialSecurityNumber, double grossSales,
double commissionRate, double baseSalary) {
super(firstName, lastName, socialSecurityNumber,
grossSales, commissionRate);

if (baseSalary < 0.0) {
throw new IllegalArgumentException(
"Base salary must be >= 0.0");
}

this.baseSalary = baseSalary;
}

public void setBaseSalary(double baseSalary) {

if (baseSalary < 0.0) {
throw new IllegalArgumentException(
"Base salary must be >= 0.0");
}

this.baseSalary = baseSalary;
}

public double getBaseSalary() {
return baseSalary;
}

@Override
public double earnings() {
return getBaseSalary() + super.earnings();
}

@Override
public String toString() {
return String.format("%s %s%n%s: %.2f", "base-salaried",
super.toString(), "base salary", getBaseSalary());

}
}



Fig:9.13
## LabelDemo

import java.awt.BorderLayout;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JFrame;

public class LabelDemo
{
public static void main(String[] args)
{
JLabel northLabel = new JLabel("North");
ImageIcon labelIcon = new ImageIcon("GUItip.gif");
JLabel centerLabel = new JLabel(labelIcon);
JLabel southLabel = new JLabel(labelIcon);
southLabel.setText("South");
JFrame application = new JFrame();
application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
application.add(northLabel, BorderLayout.NORTH);
application.add(centerLabel, BorderLayout.CENTER);
application.add(southLabel, BorderLayout.SOUTH);

application.setSize(300, 300);
application.setVisible(true);

}
}