import *;
class ObjectStream implements Serializable{
        //保存对象
        public static void saveObject(String fileName,Object obj){
                try{
                FileOutputStream fi=new FileOutputStream(fileName+".txt");
                ObjectOutputStream os=new ObjectOutputStream(fi);
                os.writeObject(obj);
                os.flush();
                }catch(Exception e){System.out.println("savaObject Error");}
        }
        //提取对象
        public static Object openObject(String fileName){
                ObjectInputStream oiT=null;
                try{
                        FileInputStream fs=new FileInputStream(fileName+".txt");
                        ObjectInputStream oi=new ObjectInputStream(fs);
                        return (Object)oi.readObject();
                }catch(Exception e){System.out.println("OpenObject Error");}
                System.out.println("Error");
                return oiT;
        }
}
class TestObject{
        static int i=1;
        public TestObject(){
                System.out.println("OK");
        }
        public static void main(String args[]){
                ObjectStream.saveObject("testObject",new TestObject());        
                System.out.println(ObjectStream.openObject("testObject").toString());        
        }
}
为什么保存对象时总是扔出异常呀。
谁能告诉我ObjectInputStream readObject()具体使用方法呀？

你要保存是TestObject类的对象，因此要对TestObject类序列化，即TestObject类要实现Serializable接口，而ObjectStream没必要序列化。

谢谢，知道了。

Treeset 需要 实现Serializable接口