serialdemo.java

java课程的资料以及实验的代码

import java.io.*;
class Day implements Serializable
{ 
  private int year,month,day;
  public Day()
  {
	year=2000;
    month=9;
    day=21;
  } 
  public Day(int y,int m,int d)
     {
     	year=y; 
     	month=m;
     	day=d;
     }
     public int getYear() { return year;}
     public int getMonth(){ return month;}
     public int getDay() { return day;}
     public void outPut() { System.out.println("The date is:"+year+"年"+month+"月"+day+"日");}
     }
     class Employee implements Serializable
      {
      	public static final int NAMESIZE=40;
        public static final int RECORDSIZE=2*NAMESIZE+8+4*3;
        private String name;
        private double salary;
        private Day hireDay;
        public Employee(){}
        public Employee(String n,double s,Day d)
        {  
        name=n;
        salary=s;
        hireDay=d;
        }
        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 ObjectSer
           {
           
           public static void main(String args[])
             throws IOException,ClassNotFoundException
             { int i;
             Employee[] staff = new Employee[3];
             staff[0] = new Employee("Dong",600,new Day(1998,9,1));
             staff[1] = new Employee("Wang",1000,new Day(1958,2,15));
             staff[2] = new Employee("Meng",750,new Day(1995,3,15)); 
             FileOutputStream fo=new FileOutputStream("data.txt");
             ObjectOutputStream so=new ObjectOutputStream(fo);
             try
              { for(i=0;i<3;i++) so.writeObject(staff[i]);
               so.close(); 
               }
             catch(IOException e)
             { System.out.println("Saving Error:"+e);
                System.exit(1); 
                }
                for(i=0;i<3;i++) staff[i]=null;
                FileInputStream fi=new FileInputStream("data.txt");
                ObjectInputStream si= new ObjectInputStream(fi);
                try
                {
                	for(i=0;i<3;i++)
                  staff[i]=(Employee) si.readObject();
                  si.close();
                  } 
                  catch(IOException e)
                  { System.out.print("Reading Error:"+e);
                  System.exit(1); 
                  } 
                  for(i=0;i<3;i++) 
                  {
                  	staff[i].print();
                  	}
                  	}
}