检验该程序哪里错了啊?

public class test0 {

public static void main(String[] args)throws Exception {
Objectout o = new Objectout(new File(new File("test.dat")));
    o.writeObject(new A());
    o.close();
}

}
class A{

}

应该是因为Objectout 这个类是接口,需要实现的他的接口方法才能使用,需要使用的方法就在实现类中实现一下,不要使用的方法就可以暂时不实现,可以暂时只留一个空方法在那里,程序一般会在项目根目录下生成一个名为object.txt的文件,里面有写入的类的信息,下面是一个简单的实现,供参考:
参考链接:
java写入文件的几种方法(一)_m0_67401746的博客-CSDN博客_java 写文件
java.io 接口 ObjectOutput - Java 中文参考手册 - 文江博客

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.ObjectOutput;

public class test implements ObjectOutput {

    public static void main(String[] args)throws Exception {
            test  t = new test();  //test类实现了ObjectOutput 接口的方法,然后就可以调用接口定义的方法了。
            t.writeObject(new A());
           
        }

    @Override
    public void writeBoolean(boolean v) throws IOException {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void writeByte(int v) throws IOException {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void writeShort(int v) throws IOException {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void writeChar(int v) throws IOException {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void writeInt(int v) throws IOException {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void writeLong(long v) throws IOException {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void writeFloat(float v) throws IOException {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void writeDouble(double v) throws IOException {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void writeBytes(String s) throws IOException {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void writeChars(String s) throws IOException {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void writeUTF(String s) throws IOException {
        // TODO Auto-generated method stub
        
    }

    @Override
    //https://blog.csdn.net/m0_67401746/article/details/123638786
 //实现接口的此方法,然后就可以在实现类中调用它
    public void writeObject(Object obj) throws IOException { 
        // TODO Auto-generated method stub
         File file =new File("object.txt");
         
            if(!file.exists()){
                file.createNewFile();
            }
     
            //使用true,即进行append file 
     
            FileWriter fileWritter = new FileWriter(file.getName(),true);
     
     
            fileWritter.write(obj.toString());
     
            fileWritter.close();
     
            System.out.println("finish");
    
    }

    @Override
    public void write(int b) throws IOException {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void write(byte[] b) throws IOException {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void write(byte[] b, int off, int len) throws IOException {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void flush() throws IOException {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void close() throws IOException {
        // TODO Auto-generated method stub
        
    }

}


class A {

    @Override
    public String toString() {  //用于写文件时,传递类的信息
        // TODO Auto-generated method stub
        return super.toString()+" this is class A.";
    }
    
}

img

程序出现什麽问题现象了呢?
为啥写了两遍new File呢

运行报错信息在哪

File类 压根儿没有 new File(File ) 的构造函数;
Objectout 又是什么鬼,ObjectOutput?ObjectOutputStream?