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云代码 - java代码库

java 对象流 以对象数据为单位进行读写 （Serializable）

2012-10-23 作者： 神马举报

[java]代码库

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import java.io.*;
import java.util.*;
 
/**
 * 对象流
 *
 * 以对象数据为单位进行读写
 *
 */
public class ObjectFileTest {
    public static void main(String[] args) {
        try {
            Employee[] staff = new Employee[3];
            staff[0] = new Employee("Harry Hacker", 35000,
                    new Date(1989, 10, 1));
            staff[1] = new Manager("Carl Cracker", 75000,
                    new Date(1987, 12, 15));
            staff[2] = new Employee("Tony Tester", 38000, new Date(1990, 3, 15));
            int i;
 
            System.out.println("Before writeObject:");
            for (i = 0; i < staff.length; i++)
                staff[i].print();
            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 (i = 0; i < newStaff.length; i++)
                newStaff[i].raiseSalary(100);
            System.out.println("After readObject:");
            for (i = 0; i < newStaff.length; i++)
                newStaff[i].print();
        } catch (Exception e) {
            System.out.print("Error: " + e);
            System.exit(1);
        }
    }
}
 
class Employee implements Serializable {
    private String name;
    private double salary;
    private Date hireDay;
 
    public Employee(String n, double s, Date d) {
        name = n;
        salary = s;
        hireDay = d;
    }
 
    public Employee() {
    }
 
    public void print() {
        System.out.println(name + " " + salary + " " + hireYear());
    }
 
    public void raiseSalary(double byPercent) {
        salary *= 1 + byPercent / 100;
    }
 
    public int hireYear() {
        return hireDay.getYear();
    }
}
 
class Manager extends Employee {
    private String secretaryName;
 
    public Manager(String n, double s, Date d) {
        super(n, s, d);
        secretaryName = "";
    }
 
    public Manager() {
    }
 
    public void raiseSalary(double byPercent) {
        Date today = new Date();
        double bonus = 0.5 * (today.getYear() + 1900 - hireYear());
        super.raiseSalary(byPercent + bonus);
    }
 
    public void setSecretaryName(String n) {
        secretaryName = n;
    }
 
    public String getSecretaryName() {
        return secretaryName;
    }
}


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