电话本管理系统HashMap实现

最新推荐文章于 2022-04-20 21:56:04 发布

zhangxiang_ouc

最新推荐文章于 2022-04-20 21:56:04 发布

阅读量773

点赞数

分类专栏： java 文章标签： java

java 专栏收录该内容

1 篇文章

订阅专栏

本文介绍了一个简单的电话本管理系统，包括添加、删除、修改联系人信息，显示所有联系人及根据姓名搜索的功能，并通过序列化技术将数据持久化存储。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

本实验用Contact对象作为HashMap的value，name作为key保存在HashMap中，最终通过序列化将其存在contact1.txt中

现在还没学会数据库也没学会swing，以后可以继续改进，出个电话本2.0和3.0

实体类Contact


package TelDirectory;

import java.io.Serializable;
//序列化
public class Contact implements Serializable {
	private String name;
	private String sex;
	private int age;
	private String phonenum;
	private String QQnum;
	private String address;


	//构造函数

	public Contact(){}
	public Contact(String name,String sex,int age,
			String phonenum,String QQnum,String address){
		this.name=name;
		this.sex=sex;
		this.age=age;
		this.phonenum=phonenum;
		this.QQnum=QQnum;
		this.address=address;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getPhonenum() {
		return phonenum;
	}
	public void setPhonenum(String phonenum) {
		this.phonenum = phonenum;
	}
	public String getQQnum() {
		return QQnum;
	}
	public void setQQnum(String QQnum) {
		QQnum = QQnum;
	}
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}

	//toString方法
	public String toString() {
		return "Contact [姓名：" + name + ", 性别：" + sex + ", 年龄：" + age
				+ ", 电话：" + phonenum + ", QQ：" + QQnum + ", 地址："
				+ address + "]";
	}

}

操作类ContactPro


package TelDirectory;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.EOFException;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Scanner;

public class ContactPro {
	private  Scanner sc;
	HashMap hm=new HashMap();

	//增加
	public void add(){
		sc = new Scanner(System.in);
		System.out.println("------添加电话本------");
		System.out.println("姓名：");
		String name=sc.nextLine();
		System.out.println("性别：");
		String sex=sc.nextLine();

		System.out.println("电话：");
		String phonenum=sc.nextLine();
		System.out.println("QQ：");
		String QQnum=sc.nextLine();
		System.out.println("地址：");
		String adress=sc.nextLine();
		System.out.println("年龄：");
		int age=sc.nextInt();

		Contact newOne=new Contact(name,sex,age,phonenum,QQnum,adress);//读到的数据构造一个Contact对象
		hm.put(name, newOne);//添加到HashMap
		System.out.println("添加成功");
	}


	//删除
	public void del(){
		sc = new Scanner(System.in);
		System.out.println("------删除电话本------");
		System.out.println("请输入要删除的姓名：");
		String name=sc.nextLine();
		if(hm.containsKey(name)){                         //判断是否有这个人
			System.out.println(hm.get(name).toString());
			System.out.println("确定要删除么 1（是）0（否）");
			int flag=sc.nextInt();
			if(flag==1){
				hm.remove(name);
				System.out.println("删除成功");
			}else{
				System.out.println("取消删除");
			}
		}else{
			System.out.println("不存在此人");
		}

	}


	//修改
	public void change(){
		sc = new Scanner(System.in);
		System.out.println("------修改电话本------");
		System.out.println("请输入要修改的姓名：");
		String name=sc.nextLine();
		if(hm.containsKey(name)){                         //判断是否有这个人
			System.out.println(hm.get(name).toString());

			hm.remove(name);                             //先删除这个人

			System.out.println("请重新输入信息");
			System.out.println("姓名：");
			String name1=sc.nextLine();
			System.out.println("性别：");
			String sex=sc.nextLine();

			System.out.println("电话：");
			String phonenum=sc.nextLine();
			System.out.println("QQ：");
			String QQnum=sc.nextLine();
			System.out.println("地址：");
			String adress=sc.nextLine();
			System.out.println("年龄：");
			int age=sc.nextInt();
			Contact newOne=new Contact(name1,sex,age,phonenum,QQnum,adress);
			hm.put(name,newOne);                         //再加上新的
			System.out.println("修改成功");
		}else{
			System.out.println("不存在此人");
		}
	}


	//打印所有
	public void show(){
		System.out.println("------显示所有-----");
		Iterator iter = hm.entrySet().iterator();
		while (iter.hasNext()) {
			Map.Entry entry = (Map.Entry) iter.next();
			System.out.println(entry.getValue().toString());
		}
	}


	//按姓名搜索
	public void search(){
		sc = new Scanner(System.in);
		System.out.println("------删除电话本------");
		System.out.println("请输入要修改的姓名：");
		String name=sc.nextLine();
		if(hm.containsKey(name)){
			System.out.println(hm.get(name).toString());
		}else{
			System.out.println("不存在此人");
		}
	}
         //清空hm
	public void clear(){
		hm.clear();
	}


	//最初用DataInputStream和DataOutputStream读取和存储电话本信息
	/*public void open() throws IOException{
		System.out.println("读取......");
		DataInputStream in=new DataInputStream(new FileInputStream("contact.txt"));
		boolean flag=true;
		while(flag){
			try{
				String name=in.readUTF();
				String sex=in.readUTF();
				String phonenum=in.readUTF();
				String QQnum=in.readUTF();
				String adress=in.readUTF();
				int age=in.readInt();
				Contact newOne=new Contact(name,sex,age,phonenum,QQnum,adress);//读到的数据构造一个Contact对象
				hm.put(name, newOne);//添加到HashMap
			}catch(EOFException e){
				flag=false;
			}
		}
		in.close();
	}
	public void save() throws IOException{
		System.out.println("保存......");
		DataOutputStream out=new DataOutputStream(new FileOutputStream("contact.txt"));
		Iterator iter = hm.entrySet().iterator();
		while (iter.hasNext()) {
			Map.Entry entry = (Map.Entry) iter.next();
			Contact val = (Contact) entry.getValue();
			out.writeUTF(val.getName());
			out.writeUTF(val.getSex());
			out.writeUTF(val.getPhonenum());
			out.writeUTF(val.getQQnum());
			out.writeUTF(val.getAddress());
			out.writeInt(val.getAge());

		}
		out.close();
		System.out.println("保存成功");
	}
	*/

	//序列化进行存储和读取

	//读取
	public void open1() throws Exception{
		System.out.println("读取......");
		ObjectInputStream in=new ObjectInputStream(new FileInputStream("contact1.txt"));
		boolean flag=true;
		while(flag){
			try{
				Contact newOne=(Contact) in.readObject();
				hm.put(newOne.getName(), newOne);//添加到HashMap
			}catch(EOFException e){
				flag=false;
			}
		}
		in.close();
	}
	//存储
	public void save1() throws Exception{
		System.out.println("保存......");
		ObjectOutputStream out=new ObjectOutputStream(new FileOutputStream("contact1.txt"));
		Iterator iter = hm.entrySet().iterator();
		while (iter.hasNext()) {
			Map.Entry entry = (Map.Entry) iter.next();
			Contact val = (Contact) entry.getValue();
			out.writeObject(val);
		}
		out.close();
		System.out.println("保存成功");
	}
}

交互


package TelDirectory;

import java.io.IOException;
import java.util.Scanner;

public class ContactTest {

	public static void main(String[] args) throws Exception  {
		ContactPro con =new ContactPro();

		int flag=0;//循环出口
		while(flag==0){
			System.out.println("----------------------电话本管理系统----------------------");
			System.out.println("1.添加\t2.删除\t3.修改\t4.显示所有\t5.根据姓名查询\t6.读取并显示\t7.保存电话本\t8.清空\t0.退出");
			System.out.println("----------------------电话本管理系统----------------------");
			System.out.println("请选择操作");
			Scanner sc1 = new Scanner(System.in);
			switch (sc1.nextInt()) {
			case 1:
				con.add();
				break;
			case 2:
				con.del();
				break;
			case 3:
				con.change();
				break;
			case 4:
				con.show();
				break;
			case 5:
				con.search();
				break;
			case 6:
				con.open1();con.show();
				break;
			case 7:
				con.save1();
				break;
			case 8:
				con.clear();
				break;
			case 0:
				flag=1;
				break;
			default:
				break;
			}
		}
	}

}