Mega Code Archive
Subclass definition
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import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
public class ObjectRefTest {
public static void main(String[] args) {
try {
Employee[] staff = new Employee[3];
Employee harry = new Employee("Harry Sample", 35000);
staff[0] = harry;
staff[1] = new Manager("Carl Java", 75000, harry);
staff[2] = new Manager("Tony rntsoft", 38000, harry);
ObjectOutputStream out = new ObjectOutputStream(
new FileOutputStream("employee.dat"));
out.writeObject(staff);
out.close();
ObjectInputStream in = new ObjectInputStream(new FileInputStream(
"employee.dat"));
Employee[] newStaff = (Employee[]) in.readObject();
for (int i = 0; i < newStaff.length; i++)
newStaff[i].raiseSalary(100);
for (int i = 0; i < newStaff.length; i++)
newStaff[i].print();
} catch (Exception e) {
e.printStackTrace();
System.exit(1);
}
}
}
class Employee implements Serializable {
public Employee(String n, double s) {
name = n;
salary = s;
}
public Employee() {
}
public void raiseSalary(double byPercent) {
salary *= 1 + byPercent / 100;
}
public void print() {
System.out.println(name + " " + salary);
}
private String name;
private double salary;
}
class Manager extends Employee {
private Employee secretary;
public Manager(String n, double s, Employee e) {
super(n, s);
secretary = e;
}
public Manager() {
}
public void raiseSalary(double byPercent) {
super.raiseSalary(byPercent + 10);
}
public void print() {
super.print();
System.out.print("Secretary: ");
if (secretary != null)
secretary.print();
}
}
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