[code]import java.util.*;
import java.io.*;
import java.lang.*;
/**
*
* @author Administrator
*/
public class Person implements Serializable{
private String name;
private int age;
private long phone;
private long id;
Person(String name,int age,long phone,long id){
this.name=name;
this.age=age;
this.phone=phone;
this.id=id;
}
public String getName(){
return name;
}
public void setName(String name){
this.name=name;
}
public int getAge(){
return age;
}
public void setAge(int age){
this.age=age;
}
public long getPhone(){
return phone;
}
public void setName(long phone){
this.phone=phone;
}
public long getId(){
return id;
}
public void setId(long id){
this.id=id;
}
public static void main(String[] args) {
Map map = new HashMap();
exit:
try{
FileOutputStream fos=new FileOutputStream("C:\\Person.txt");
ObjectOutputStream obs=new ObjectOutputStream(fos);
obs.writeObject(map);
for(;;)
{
System.out.println("1、保存 2、查询3、删除 4、修改 5、退出");
Scanner scanner1 = new Scanner(System.in);//扫描器，接受控制台的输入信息
String str=scanner1.nextLine();//取出控制台的一行信息,也就是你输入的信息
char[] choose=str.toCharArray();//把取道的字符串变成一个char数组
FileInputStream fis=new FileInputStream("C:\\Person.txt");
ObjectInputStream ois=new ObjectInputStream(fis);
ois.readObject();
if(choose.length>1)
{
System.out.println("只能输入1-5的数字");
}else {
switch (choose[0]) {
case '1':
FileInputStream fix=new FileInputStream("C:\\Person.txt");
ObjectInputStream oix=new ObjectInputStream(fix);
map=(HashMap)oix.readObject();
System.out.print("请输入学号：");
Scanner scanner2 = new Scanner(System.in);
String id = scanner2.nextLine();
System.out.print("请输入姓名：");
Scanner scanner3 = new Scanner(System.in);
String name = scanner3.nextLine();
System.out.print("请输入电话号码：");
Scanner scanner4 = new Scanner(System.in);
String phone = scanner4.nextLine();
System.out.print("请输入年龄：");
Scanner scanner5 = new Scanner(System.in);
String age= scanner5.nextLine();
map.put(id,map);
System.out.println("保存成功");
break;
case '2':
FileInputStream fib=new FileInputStream("C:\\Person.txt");
ObjectInputStream oib=new ObjectInputStream(fib);
oib.readObject();
if(map.size()==0)
{
System.out.println("通讯录为空，请先添加");
}else {
Iterator it = map.keySet().iterator();//map.keySet()返回一个对象实例，调用iterator()方法，返回Iterator类型赋给it。实现遍历输出
while(it.hasNext()){
String key = (String) it.next();
String value = (String) map.get(key);
System.out.println(key+" "+value);
}
}
break;
case '3':