public class TestObjectWR {

    public static void main(String[] args) {
        
        File f = new File("serialize");
        if(!f.exists())
            try {
                f.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
        
        ObjectOutputStream out = null;
        try {
            out = new ObjectOutputStream(new FileOutputStream(f));
            List<String> strs = new ArrayList<String>();
            strs.add("foo");
            strs.add("bar");
            out.writeObject(strs);
            out.flush();
        } catch (FileNotFoundException e) {
    
            e.printStackTrace();
        } catch (IOException e) {
        
            e.printStackTrace();
        }finally{
        
            if(out!=null)
                try {
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
        }
        
        ObjectInputStream in = null;
        try {
            in = new ObjectInputStream(new FileInputStream(f));
            List<String> list = (List<String>) in.readObject();
            for(String s:list)
                System.out.println(s);
        } catch (FileNotFoundException e) {
            
            e.printStackTrace();
        } catch (IOException e) {
            
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }finally{
            if(in!=null)
                try {
                    in.close();
                } catch (IOException e) {

                    e.printStackTrace();
                }
        }
        
        
    }
    
}

------解决方案--------------------
这个不太熟悉，是这个意思吗？我这个貌似没啥错。。。
Java code

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.List;

public class StringTest {
    public static void main(String[] args) throws Exception {
        List<String> sList = new ArrayList<String>();
        sList.add("123");
        sList.add("123");
        sList.add("123");
        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("slist.txt"));
        oos.writeObject(sList);
        oos.close();
        
        ObjectInputStream ois = new ObjectInputStream(new FileInputStream("slist.txt"));
        List<String> sList2 = (ArrayList<String>)ois.readObject();
        ois.close();
        
        System.out.println(sList2);
    }
}