java 文件写入问题 求助

Question

代码如下
import java.io.*;
import java.util.ArrayList;
public class BruteForce {  public static void main (String args[]){
  try {
ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("C:\\Users\\Fredo\\Workspaces\\MyEclipse 8.5\\AgendaProgram\\data.txt"));
ObjectInputStream  ois = new ObjectInputStream(new FileInputStream  ("C:\\Users\\Fredo\\Workspaces\\MyEclipse 8.5\\AgendaProgram\\data.txt"));
            ArrayList<FileOperation> info = new ArrayList<FileOperation>();
           // ois.defaultReadObject();
           info = (ArrayList<FileOperation>) ois.readObject();
            System.out.print("asd");
            info.add(new FileOperation("asdf","adsf"));
            oos.writeObject(info);
oos.flush();
oos.close();
ois.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

 }class FileOperation implements Serializable{
    public String username;
    public String password;
    
    //构造函数
    public FileOperation (String username,String password) {
       this.username = username;
       this.password = password;
    }
    
}显示错误老是 java.io.EOFException
at java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2554)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1297)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
at BruteForce.main(BruteForce.java:14)

Answer 1

读写同一个文件，读和写要分开。
new FileInputStream
read
close
new FileOutputStream
write
close

Answer 2

//是不是操作的是同一个文件引起的？！
ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("C:\\Users\\Fredo\\Workspaces\\MyEclipse 8.5\\AgendaProgram\\data.txt"));
ObjectInputStream ois = new ObjectInputStream(new FileInputStream ("C:\\Users\\Fredo\\Workspaces\\MyEclipse 8.5\\AgendaProgram\\data.txt"));

Answer 3

Hi guy,