Herencia

Herencia

Ejemplo 1:

/**
@version 1.20 1998-09-17
@author Cay Horstmann
*/

import java.util.*;

public class ManagerTest
{
public static void main(String[] args)
{// construct a Manager object
Manager boss = new Manager("Carl Cracker", 80000,
1987, 12, 15);
boss.setBonus(5000);

Employee[] staff = new Employee[3];// fill the staff array with Manager and Employee objects

staff[0] = boss;
staff[1] = new Employee("Harry Hacker", 50000,
1989, 10, 1);
staff[2] = new Employee("TommyTester", 40000,
1990, 3, 15);

// print out information about all Employee objects
for (int i = 0; i < staff.length; i++)
{
Employee e = staff[i];System.out.println("name=" + e.getName()
+ ",salary=" + e.getSalary());
}
}
}

class Employee
{
public Employee(String n, double s,
int year, int month, int day){
name = n;
salary = s;
GregorianCalendar calendar
= new GregorianCalendar(year, month - 1, day);
// GregorianCalendar uses 0 for January
hireDay =calendar.getTime();
}

public String getName()
{
return name;
}

public double getSalary()
{
return salary;
}

public Date getHireDay()
{return hireDay;
}

public void raiseSalary(double byPercent)
{
double raise = salary * byPercent / 100;
salary += raise;
}

private String name;
private doublesalary;
private Date hireDay;
}

class Manager extends Employee
{
/**
@param n the employee's name
@param s the salary
@param year the hire year
@param month thehire month
@param day the hire day
*/
public Manager(String n, double s,
int year, int month, int day)
{
super(n, s, year, month, day);
bonus = 0;
}...