objectStream.java
package randomAccess;
import Employee.Employee;
import Employee.Manager;
import java.io.*;
public class objectStream {
public static void main(String[] args) throws ClassNotFoundException{
Employee harry = new Employee("harry",50000d,1989,10,1);
Manager carl = new Manager("carl",8000d,1983,12,22);
carl.setSecretary(harry);
Manager tony = new Manager("tony",4000d,1990,3,15);
tony.setSecretary(harry);
Employee[] staff = new Employee[3];
staff[0] = carl;
staff[1] = harry;
staff[2] = tony;
try(ObjectOutputStream out = new ObjectOutputStream((new FileOutputStream("employee.dat")))){
out.writeObject(staff);
}catch (IOException e){
System.out.println(e);
}
try(ObjectInputStream in = new ObjectInputStream(new FileInputStream("employee.dat"))){
Employee[] newStaff = (Employee[])in.readObject();
//raise secretary's salary
newStaff[1].raiseSalaryt(10);
for (Employee e:newStaff
) {
System.out.println(e);
}
}catch (IOException e){
}
}
}
## Employee
package Employee;
import java.io.Serializable;
import java.time.LocalDate;
public class Employee implements Serializable{
private String name;
private double salary;
private LocalDate hireDay;
public Employee(String name,Double salary,int year,int month, int day ){
this.name = name;
this.salary = salary;
this.hireDay = LocalDate.of(year,month,day);
}
public String getName() {
return name;
}
public double getSalary() {
return salary;
}
public LocalDate getHireDay() {
return hireDay;
}
public void setName(String name) {
this.name = name;
}
public void setSalary(double salary) {
this.salary = salary;
}
public void setHireDay(LocalDate hireDay) {
this.hireDay = hireDay;
}
public void raiseSalaryt(double byPercent){
double raise = salary*byPercent/100;
salary+=raise;
}
@Override
public String toString() {
return "Employee{" +
"name='" + name + '\'' +
", salary=" + salary +
", hireDay=" + hireDay +
'}';
}
}
Manager
package Employee;
import java.io.Serializable;
public class Manager extends Employee implements Serializable{
private double bouns;
private Employee secretary;
public void setSecretary(Employee secretary) {
this.secretary = secretary;
}
public Manager(String name, double salary, int year, int month, int day) {
super(name,salary,year,month,day);
bouns = 0;
}
public double getSalary(){
double baseSalary = super.getSalary();
return baseSalary+bouns;
}
public void setBouns(double d){
bouns = d;
}
}
运行结果截图
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