Java编写一个班级通讯录

import java.util.ArrayList;

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import java.util.List;

import java.util.Scanner;

public class AddressList {

static Scanner scanner = new Scanner(System.in);

static ListEntity enlist = new ArrayListEntity();

public static void main(String[] args) {

int input;

AddressList addre = new AddressList();

System.out.println("===============欢迎使用**通讯录===============");

do{

System.out.println("1、插入联系人");

System.out.println("2、删除练习人");

System.out.println("3、修改联系人");

System.out.println("4、查询练习人");

System.out.println("5、查询全部联系人");

System.out.println("0、退出系统");

System.out.println("请选择：");

input = scanner.nextInt();

switch(input){

case 1:

Entity e = new Entity();

e.id = enlist.size();

System.out.println("请输入联系人姓名：");

e.name = scanner.next();

System.out.println("请输入联系方式：");

e.number = scanner.nextInt();

addre.add(e);

System.out.println("插入成功！");

break;

case 2:

System.out.println("请输入要删除联系人编号：");

int num = scanner.nextInt();

if(addre.delete(num))

System.out.println("删除成功！");

else

System.out.println("删除失败，请确认信息是否正确！");

break;

case 3:

System.out.println("请输入要修改人编号：");

int unum = scanner.nextInt();

addre.update(unum);

System.out.println("修改完成！");

break;

case 4:

System.out.println("请输入要查询人姓名：");

String name = scanner.next();

Entity ent = addre.select(name);

if(ent!=null){

System.out.println(name+"的联系方式为："+ent.number);

}else{

System.out.println("查无此人！");

}

break;

case 5:

for(Entity entit:enlist){

System.out.println(entit.name+"的联系方式为："+entit.number);

}

break;

}

}while(input!=0);

System.out.println("谢谢使用！");

}

/*

 * 添加联系人

 */

public boolean add(Entity e){

enlist.add(e);

return true;

}

/*

 * 删除联系人

 */

public boolean delete(int num){

if(numenlist.size())

return false;

else

enlist.remove(num);

return true;

}

/*

 * 修改联系人

 */

public void update(int num){

if(numenlist.size())

System.out.println("查无此人！");

else{

Entity e = new Entity();

e.id = num;

System.out.println("请输入联系人姓名：");

e.name = scanner.next();

System.out.println("请输入联系方式：");

e.number = scanner.nextInt();

enlist.set(num, e);

}

}

/*

 * 查询指定联系人电话

 */

public Entity select(String name){

Entity en = null;

for(Entity e : enlist){

if(e.name.equals(name))

en = e;

}

return en;

}

}

class Entity{

public int id;//编号

public String name;//姓名

public int number;//联系电话

}

java通讯录全部代码！

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.FileReader;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Scanner;

public class AddList {

private String filePath = "";

private String bakPath = "";

private String content = "";

Scanner sc = new Scanner(System.in);

public String readFile(){

content = "";

if (isNull(filePath)) {

System.out.println("文件存储路径：");

filePath = sc.nextLine();

}

File file = new File(filePath);

FileReader fr = null;

try {

if (file.exists()) {

fr = new FileReader(file);

char[] chars = new char[1024];

int n = 0;

while((n = fr.read(chars)) != -1){

String string = new String(chars, 0, n);

content = content + string;

}

} else {

System.out.println("文件不存在");

}

} catch (Exception e) {

e.printStackTrace();

} finally {

if (fr != null) {

try {

fr.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

return content;

}

public void writeFile(String path){

File file = new File(path);

FileOutputStream fos = null;

mkDirs(path);

try {

fos = new FileOutputStream(file);

BufferedOutputStream bos = new BufferedOutputStream(fos);

PrintWriter pw = new PrintWriter(bos, true);

pw.print(content);

pw.flush();

} catch (FileNotFoundException e) {

e.printStackTrace();

} finally {

if (fos != null) {

try {

fos.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

}

public void writeFile(){

if (isNull(filePath)) {

System.out.println("文件存储路径：");

filePath = sc.nextLine();

}

File file = new File(filePath);

FileOutputStream fos = null;

mkDirs(filePath);

try {

fos = new FileOutputStream(file);

BufferedOutputStream bos = new BufferedOutputStream(fos);

PrintWriter pw = new PrintWriter(bos, true);

pw.print(content);

pw.flush();

} catch (FileNotFoundException e) {

e.printStackTrace();

} finally {

if (fos != null) {

try {

fos.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

}

public void mkDirs(String filepath){

if (filepath.indexOf("\\") != -1) {

filepath = filepath.replaceAll("\\", "/");

}

int n = filepath.indexOf("//");

String path = filepath.substring(0, n) + "//";

filepath = filepath.substring(filepath.indexOf("//") + 1, filepath.length());

String[] files = filepath.split("/");

for (int i = 0; i files.length - 1; i++) {

path = path + files[i];

File file = new File(path);

if (!file.exists()) {

file.mkdir();

}

}

}

public void addImfor(){

System.out.println("--------增加记录---------");

String name = "";

String tel = "";

String email = "";

content = readFile();

while(true){

System.out.println("姓名：");

name = sc.next();

System.out.println("电话：");

tel = sc.next();

System.out.println("Email：");

email = sc.next();

content = content + name + "" + tel + "" + email +"==";

System.out.println("0、Exit 1、继续");

int i = sc.nextInt();

if (i == 0) {

break;

}

}

writeFile();

}

public void deleteImfor(){

System.out.println("---------删除记录---------");

String name = "";

String[] imfors = null;

content = readFile();

while(true){

System.out.println("你要删除的姓名是：");

name = sc.next();

if (content.indexOf(name) != -1) {

imfors = content.split("==");

for (int i = 0; i imfors.length; i++) {

if (imfors[i].indexOf(name) != -1) {

imfors[i] = "";

}

}

实现一个小型通讯录。Java

Friend类：public class Friend {

/*

* 姓名

*/

private String name;

/*

* 电话

*/

private String telephone;

/*

* 邮箱

*/

private String email;

/*

* 公司

*/

private String company; public String getName() {

return name;

} public void setName(String name) {

this.name = name;

} public String getTelephone() {

return telephone;

} public void setTelephone(String telephone) {

this.telephone = telephone;

} public String getEmail() {

return email;

} public void setEmail(String email) {

this.email = email;

} public String getCompany() {

return company;

} public void setCompany(String company) {

this.company = company;

} public String toString() {

StringBuffer str = new StringBuffer(); str.append("姓名：" + name).append("\n");

str.append("电话：" + telephone).append("\n");

str.append("邮箱：" + email).append("\n");

str.append("公司：" + company).append("\n");

str.append("-----------------------------------------\n");

return str.toString();

}

}AddFriend类：public class AddFriend { /**

* 主方法 程序的入口

*/

public static void main(String[] args) {

ListFriend friendList = new ArrayListFriend();

char isGo = 'Y';

int i = 0;

do {

Friend friend = new Friend();

System.out.println("请输入第" + (i + 1) + "位朋友的姓名：");

InputStreamReader reader = new InputStreamReader(System.in);

String str = "";

try {

str = (new BufferedReader(reader)).readLine();

} catch (IOException e) {

e.printStackTrace();

}

friend.setName(str); System.out.println("请输入第" + (i + 1) + "位朋友的电话："); try {

str = (new BufferedReader(reader)).readLine();

} catch (IOException e) {

e.printStackTrace();

}

if (str.matches("\\d*") str.length() == 11) {// 判断用户输入的电话是否符合标准

friend.setTelephone(str);

} else {

System.out.println("电话号码输入有误，请重新输入！");

continue;

} System.out.println("请输入第" + (i + 1) + "位朋友的邮箱："); try {

str = (new BufferedReader(reader)).readLine();

} catch (IOException e) {

e.printStackTrace();

}

friend.setEmail(str); System.out.println("请输入第" + (i + 1) + "位朋友的公司："); try {

str = (new BufferedReader(reader)).readLine();

} catch (IOException e) {

e.printStackTrace();

}

friend.setCompany(str); friendList.add(friend); i++; System.out.println("是否继续添加？(Y/N):");

String go = "";

try {

go = (new BufferedReader(reader)).readLine();

} catch (IOException e) {

e.printStackTrace();

}

isGo = go.charAt(0);

} while (isGo == 'Y' || isGo == 'y'); for (int j = 0; j friendList.size(); j++) {

System.out.println(friendList.get(j).toString());

}

}

}

文章题目：java简单通讯录代码 通讯录程序代码
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