ObjectOutputStream을 이용하여 객체를 파일에 저장하기

• Student 객체를 저장한다.
• OutjectoutputStream과 ObjectInputStream 사용법을 익힌다.
• 직렬화 객체만 readobject와 writeObject를 사용하여 읽고 저장할 수 있다.

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import java.io.*; import java.util.Vector; public class ObjectStudentWrite {     public int write(String fname, Vector v) throws IOException{     //public int write(String fname, Vector v) throws IOException{//JAVA5         int objectNumber=0;         try {             FileOutputStream fos=new FileOutputStream(fname);             ObjectOutputStream oos=new ObjectOutputStream(fos);//throws             objectNumber=v.size();             oos.writeInt(objectNumber);             System.out.println(objectNumber+"개의 Student가 입력됨");             for(int i=0;i                 oos.writeInt(i);                 oos.writeObject((Student)v.get(i));                 //oos.writeObject(v.get(i));//JAVA5                 oos.flush();                 System.out.println(i+"번째의  Student가 입력됨");             }             oos.close();   fos.close();         } catch (FileNotFoundException e) {             System.out.println("잘못된 파일이름을 입력했습니다.");         } catch(Exception ee){             throw new IOException("타입이 이상합니다."+ee);         }         return objectNumber;     }     public void read(String fname) throws IOException{         try {             FileInputStream fis = new FileInputStream(fname);             ObjectInputStream ois=new ObjectInputStream(fis);//throws             int objectNumber=ois.readInt();             System.out.println(objectNumber+"개의 Student를 읽음");             for(int i=0;i                 try {                     System.out.print(ois.readInt()+"번째 :");                     System.out.println((Student)ois.readObject());                 } catch (ClassNotFoundException e1) {                     System.out.println("잘못된 타입입니다..");                 }             }             ois.close();  fis.close();         } catch (FileNotFoundException e) {             System.out.println("잘못된 파일이름을 입력했습니다.");         }     } }

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import java.io.IOException; import java.util.Vector; public class ObjectStudentWriteMain {     public static void main(String[] args) {         ObjectStudentWrite osw=new ObjectStudentWrite();         Vector v=new Vector(5, 5);         //Vector v=new Vector(5, 5);//JAVA5         v.add(new Student("홍길동",17,"한양"));         v.add(new Student("홍길순",15,"순천"));         v.add(new Student("몽룡",20,"화천"));         v.add(new Student("춘향",18,"삼척"));         try {             osw.write("stu.txt",v);             osw.read("stu.txt");         } catch (IOException e) {             e.printStackTrace();         }     } }