Java核心技术II：对象流与序列化

保存和重新加载Employee和Manager对象网络的代码（有些对象共享相同的表示秘书的雇员）。秘书对象在重新加载之后是唯一的。

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.Serializable;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Scanner;

/**
 * 
 */

/**
 * @author Administrator 新浪微博：ouc大飞
 */
public class ObjectStreamTest {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub

        Employee1 harry = new Employee1("Harry Hacker", 50000, 1989, 10, 1);
        Manager carl = new Manager("Carl Cracker", 75000, 1987, 12, 15);
        carl.setSecretary(harry);
        Manager tonny = new Manager("Tony Tester", 4000, 1990, 3, 15);
        tonny.setSecretary(harry);
        Employee1[] staff = new Employee1[3];
        staff[0] = carl;
        staff[1] = harry;
        staff[2] = tonny;
        try {

            ObjectOutputStream out=new  ObjectOutputStream(new  FileOutputStream("D:\\ww.dat"));

            out.writeObject(staff);
            out.close();

            ObjectInputStream in=new  ObjectInputStream(new  FileInputStream("D:\\ww.dat"));
            Employee1[] newStaff=(Employee1[])in.readObject();
            in.close();
            newStaff[1].raiseSalary(10);

            for(Employee1 e:newStaff)
                System.out.println(e);
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
    }

}

class Employee1 implements Serializable {
    public Employee1() {

    }

    public Employee1(String n, double s, int year, int month, int day) {
        name = n;
        salary = s;
        GregorianCalendar calendar = new GregorianCalendar(year, month - 1, day);
        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;
    }

    public String toString() {

        return getClass().getName() + "[name=" + name + ",salary=" + salary + ",hireDay=" + hireDay + "]";

    }

    private String name;
    private double salary;
    private Date hireDay;
}

class Manager extends Employee1 {
    public Manager(String n, double s, int year, int month, int day) {
        super(n, s, year, month, day);
        secretary = null;
    }

    public void setSecretary(Employee1 s) {
        secretary = s;
    }

    public String toString() {
        return super.toString() + "[secretary=" + secretary + "]";
    }

    private Employee1 secretary;
}