java的实体对象？

Question

java web QQ：群 4181313

Answer 1

Serializable 序列化，自己搜搜吧

Answer 2

new ObjectInputStream(new FileInputStream(
"C:\\metadata\\metadata.file"));
System.out.println("?");抛io异常，怎么回事？

Answer 3

java.io.EOFException
at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2165)
at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:2631)
at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:734)
at java.io.ObjectInputStream.<init>(ObjectInputStream.java:253)
文件是存在的

Answer 4

一个例子/*
 * @(#) Test.java
 * Created on 2004-10-8
 * By James Fancy
 */package jamesfancy;import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Serializable;
import java.util.Iterator;
import java.util.Vector;/**
 * Test
 * 
 * @author James
 */
public class Test implements Serializable {    private Vector data;    public Test() {
        data = new Vector();
        data.add("Hi");
        data.add("Hello");
        data.add("How do you do");
        data.add("Good bye");
    }    public void print() {
        if (data != null) {
            Iterator iterator = data.iterator();
            while (iterator.hasNext()) {
                System.out.println(iterator.next());
            }
        }
    }    public static Test read(InputStream inputStream) throws IOException,
        ClassNotFoundException {
        ObjectInputStream ois = new ObjectInputStream(inputStream);
        Test test = (Test) ois.readObject();
        ois.close();
        return test;
    }    public static void write(OutputStream outputStream, Test test)
        throws IOException {
        ObjectOutputStream oos = new ObjectOutputStream(outputStream);
        oos.writeObject(test);
    }    public static void main(String[] args) throws IOException,
        ClassNotFoundException {
        Test t1 = new Test();
        System.out.println("-------- t1 -------");
        t1.print();
        Test.write(new FileOutputStream("E:\\james\\test.dat"), t1);
        Test t2 = Test.read(new FileInputStream("E:\\james\\test.dat"));
        System.out.println("-------- t2 -------");
        t2.print();
    }
}