Class Composition demonstration - Java Object Oriented Design

Java examples for Object Oriented Design:Class

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Description

Class Composition demonstration

Demo Code

public class Main 
{
   public static void main(String[] args)
   {// w w w  . jav a  2 s . c o m
      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); 
   } 
}
 class Date 
{
   private int month; // 1-12
   private int day; // 1-31 based on month
   private int year; // any year

   private static final int[] daysPerMonth = 
      {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
   
   // constructor: confirm proper value for month and day given the year
   public Date(int month, int day, int year)
   {
      this.month = month;
      this.day = day;
      this.year = year;

      System.out.printf("Date object constructor for date %s%n", this);
   } 
   
   // return a String of the form month/day/year
   public String toString()
   { 
      return String.format("%d/%d/%d", month, day, year); 
   } 
}
 class Employee 
{
   private String firstName;
   private String lastName;
   private Date birthDate;
   private Date hireDate;

   // constructor to initialize name, birth date and hire date
   public Employee(String firstName, String lastName, Date birthDate, 
      Date hireDate)
   {
      this.firstName = firstName;
      this.lastName = lastName;
      this.birthDate = birthDate;
      this.hireDate = hireDate;
   } 

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

Result


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