//要想Person能以对象的形式保存到文件,Person类必须实现序列化:Serializable
class Person implements Serializable{
private static final long serialVersionUID = 6213933727640755594L;
private String name;
private int id;
Person(String n,int i){
name=n;id=i;
}
public String getName(){return name;}
public int getId(){return id;}
public String toString(){return "name:"+name+" id:"+id;}
}