用Java语言实现一个电话簿用文本文档储存并实现新增删除修改等功能的控制台小程序

具体功能介绍：
若不存在储存信息的文本文档首先会创建文档，若存在则判断是否为空，若为空则输出电话本为空，若不为空则加载文档内的数据。
加载完成后，用户可以根据输入0~6选择具体功能完成相关操作。

具体代码如下：

在一个Java项目telBook下建两个包分别为main包和netty

netty包中含有类TelInfo

package netty;

public class TelInfo {
	private String  name;
	private String num;
	
	public TelInfo(String name, String num) {
		super();
		this.name = name;
		this.num = num;
	}
	public TelInfo() {
		
	}
	
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getNum() {
		return num;
	}
	public void setNum(String num) {
		this.num = num;
	}
}

main包中含有类TelOperator

package main;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import netty.TelInfo;

public class TelOperator {
	boolean status=true;
	Scanner sc = new Scanner (System.in);
	List<TelInfo> infolist = new ArrayList<TelInfo>();
	
	public static void main(String[] args)  throws IOException{
		TelOperator op = new TelOperator();
		File file = new File("d:/telBooks.txt");
		if(!file.exists()) {
			file.createNewFile();
		}else {
			op.readBook();
		}
		op.operator();
		
	}
	
	private void readBook() {
		try {
			FileReader fr = new FileReader("d:/telBooks.txt");
			if(fr.read()==-1) {
				System.out.println("电话本为空，可通过主界面进行相关操作...");
			}else {
				BufferedReader br = new BufferedReader(fr);
				String line;
				while((line=br.readLine())!=null) {
					String[] strs = line.split(",");
					TelInfo info = new TelInfo(strs[0], strs[1]);
					infolist.add(info);
 				}
				br.close();
				fr.close();
				System.out.println("数据已加载完成...");
			}
		} catch (IOException e) {
			
			e.printStackTrace();
		}
	}
	
	public void operator(){
	while(status) {
		System.out.println("---------------------电话本---------------------");
		System.out.println("1.新增\t2.删除\t3.修改\t4.查询\t5.查询所有\t6.保存\t0.退出\t");
		System.out.println("---------------------电话本---------------------");
		System.out.println("请输入数字选择功能:");
		int falg = sc.nextInt();
		
		switch (falg) {
		case 1: {
			//新增电话本方法
			addTel();
			break;
		}
		case 2: {
			//删除电话本方法
			delete();
			break;
		}
		case 3: {
			//修改电话本方法
			updata();
			break;
		}
		case 4: {
			//查询电话本方法
			find();
			break;
		}
		case 5: {
			findAll();
			//查询所有电话本方法
			break;
		}
		case 6: {
			//保存电话本方法
			saveBook();
			break;
		}
		case 0: {
			//退出电话本方法
			sc.close();
			status=false;
			break;
		}
		default:
			System.out.println("输出错误，请重新输入");
		}
		}
}
	
	private void updata() {
		System.out.println("请输入要修改的账户姓名：");
		String name = sc.next();
		System.out.println("输入修改后的号码：");
		String num = sc.next();
		for(TelInfo book:infolist) {
			if(book.getName().equals(name)) {
				book.setNum(num);
				System.out.println("修改成功！");
			}
		}
	}
	private void find() {
		System.out.println("输入想要查找的名字：");
		String name = sc.next();
		
		int i=0;
		for(TelInfo info:infolist) {
			
			if(info.getName().equals(name)) {
				System.out.println("姓名："+info.getName()+"\t电话号码："+info.getNum());
				i++;
			}
		}
		if(i==0) {
			System.out.println("未查询到");
		}
	}
	
	private void delete() {
		System.out.println("请输入要删除的联系人姓名：");
		String dname = sc.next();
		int i3=0;
		for(int i =0;i<infolist.size();i++) {
			TelInfo book = infolist.get(i);
			if(book.getName().equals(dname)) {
				infolist.remove(book);
				System.out.println("删除成功！");
				i3++;
			}else {
				continue;
			}
		}
		if(i3==0) {
			System.out.println("未查询到删除对象");
		}
			
	}
	private void saveBook() {
		
		try {
			FileWriter fw=new FileWriter("d:/telBooks.txt");
			BufferedWriter out = new BufferedWriter(fw);
			for(TelInfo info:infolist) {
				out.write(info.getName()+","+info.getNum());
				out.write("\r\n");
			}
			out.flush();//将缓冲区数据批量压入文件中
			out.close();
			System.out.println("保存成功！");
		}catch (IOException e) {
			
			e.printStackTrace();
		}
		
		
	}
	private void addTel() {
		System.out.println("请输入姓名：");
		String name = sc.next();
		System.out.println("请输入电话号码：");
		String num = sc.next();
		
		TelInfo info = new TelInfo(name, num);
		int ii=0;
		for(TelInfo info1:infolist) {
			
			if(info1.getName().equals(name)) {
				ii++;
				System.out.println("输入姓名已存在，请重新输入，如想替换请选择修改");
			break;
			}
		}
		if(ii==0) {
		infolist.add(info);
		System.out.println("姓名："+info.getName()+"\t电话号码："+info.getNum());
	}
	}
	private void findAll() {
		int i=0;
		for(TelInfo info:infolist) {
			i++;
			System.out.println("姓名："+info.getName()+"\t电话号码："+info.getNum());
		}
		if(i==0) {
			System.out.println("电话本为空");
		}
	}
}