实现Serializable

@Test
    public void serializableTest(){
        try {
            User u=new User(11,"喵喵喵");
            ObjectOutputStream op=new ObjectOutputStream(new FileOutputStream("/Users/macmini/Desktop/aa"));
            op.writeObject(u);
            op.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    @Test
    public void serializableTest2(){
        try {
            ObjectInputStream oi=new ObjectInputStream(new FileInputStream("/Users/macmini/Desktop/aa"));
            User u= (User) oi.readObject();
            System.out.println(u);
            System.out.println(u.getAge()+":"+u.getName());
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

private static final long serialVersionUID=1L;

在类中声明 static final 修饰的常量 serialVersionUID后，当类中的成员有所改变时，还是可以最大程度的反序列化，否则程序会报错。