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PhoneBook类：
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PhoneBook
数据存储Database类
Database
键盘输入并转换字符（KeyBoardInput）类：
KeyBoardInput类
存储查找控制类(DoMain):
DoMain
测试类 Demo：
Demo24
测试结果：
1 设计功能 如 增加联系人，删除练习人，修改联系人
2 设计界面 用swing画个简单界面。
3 编写功能代码，实现功能。
4 做数据持久化，看是把信息存在数据库，还是存在文件里。
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] = "";
}
}
具体方法如下：
1、定义封装一条记录的实体类
2、根据实际系统容量，定义一个数组
3、完成系统中显示全部记录的逻辑
4、完成系统中添加一条记录的逻辑
5、完成系统中删除一条记录的逻辑
6、完成系统中修改一条记录的逻辑
7、全部代码：
import java.util.Scanner;
class Contact {
String cellPhone;
String name;
}
public class Main {
private static void menu () {
System.out.println("************** 菜单 ******"
+ "************");
System.out.println(" 1.显示全部通讯录");
System.out.println(" 2.增加一条记录");
System.out.println(" 3.删除一条记录");
System.out.println(" 4.修改一条记录");
System.out.println(" 0.退出");
}
public static void main(String[] args) {
Scanner scn = new Scanner(System.in);
Contact[] contacts = new Contact[200];
int size = 0;
String cmd = "";
do {
menu();
System.out.print("请输入你得选择：(0-4)");
cmd = scn.nextLine();
if (cmd.equals("1")) {
if (size == 0)
System.out.println("系统当前无记录！");
else
for (int i = 0; i size; i++) {
System.out.println(contacts[i].name + ":"
+ contacts[i].cellPhone);
}
} else if (cmd.equals("2")) {
System.out.print("请输入手机号：");
String cellphone = scn.nextLine();
System.out.print("请输入姓名：");
String name = scn.nextLine();
Contact contact = new Contact();
contact.cellPhone = cellphone;
contact.name = name;
if (size contacts.length) {
contacts[size++] = contact;
System.out.println("添加成功！");
} else {
System.out.println("你最多只能添加" +
contacts.length + "条记录");
}
} else if (cmd.equals("3")) {
System.out.print("请输入要删除的手机号：");
String cellphone = scn.nextLine();
int index = -1;
for (int i = 0; i size i contacts.length;
i++) {
if (contacts[i].cellPhone.equals(cellphone)) {
index = i;
break;
}
}
if (index == -1) {
System.out.println("该记录不存在！");
} else {
for (int i = index; i size; i++) {
contacts[index] = contacts[index + 1];
}
contacts[size - 1] = null;
size--;
System.out.println("删除成功！");
}
} else if (cmd.equals("4")) {
System.out.print("请输入要修改的手机号：");
String cellphone = scn.nextLine();
int index = -1;
for (int i = 0; i size i contacts.length;
i++) {
if (contacts[i].cellPhone.equals(cellphone)) {
index = i;
break;
}
}
if (index == -1) {
System.out.println("该记录不存在！");
} else {
System.out.print("请输入姓名：");
String name = scn.nextLine();
contacts[index].name = name;
}
}
} while (!cmd.equals("0"));
System.out.println("退出成功！");
scn.close();
System.exit(0);
}
}
public class PhoneData {
private String name;
private String phonenumber;
private int ID;
PhoneData(String name,String phonenumber,int ID){
this.setName(name);
this.setPhonenumber(phonenumber);
this.setID(ID);
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPhonenumber() {
return phonenumber;
}
public void setPhonenumber(String phonenumber) {
this.phonenumber = phonenumber;
}
public int getID() {
return ID;
}
public void setID(int iD) {
ID = iD;
}
}
import java.io.*;
public class PhoneBook {
int count=0;//计数器
String name;
String phonenumber;
int ID;
PhoneData[] data=new PhoneData[100];
//初始化
PhoneBook(){
this.name="张三";
this.phonenumber="12587968541";
this.ID=1;
data[0]=new PhoneData(name,phonenumber,ID);
data[1]=new PhoneData("li","245879",2);
count=2;
}
//按电话查找
public void searhByPhoneNum(String phonenumber){
for(int i=0;icount;i++)
if(phonenumber.equals(data[i].getPhonenumber())){
System.out.println(data[i].getName());
System.out.println(data[i].getID());
}
else
System.out.println("没有该信息！");
}
//按编号查找
public void serchByPhoneid(int ID){
for(int i=0;icount;i++)
if(ID==(data[i].getID())){
System.out.println(data[i].getName());
System.out.println(data[i].getPhonenumber());
}
else
System.out.println("没有该信息！");
}
//按姓名查找
public void searchByName(String name){
for(int i=0;icount;i++)
if(name.equals(data[i].getName())){
System.out.println(data[i].getPhonenumber());
System.out.println(data[i].getID());
}
else
System.out.println("没有该信息！");
}
//添加通讯录
public void addinfo(String name,String phonenumber,int ID){
if(count100){
System.out.println("容量已满，不能再存储了！");
}
else{
data[count++]=new PhoneData(name,phonenumber,ID);
}
}
//删除指定编号
public void deleteinfo(int id){
for(int i=0;icount;i++)
if(id==data[i].getID()){
System.out.println(data[i].getName());
System.out.println(data[i].getPhonenumber());
for(int j=i;jcount-1;j++){
data[j]=data[j+1];
}
count--;
System.out.println("已删除！");
}
else
System.out.println("没有该信息！");
}
//显示所有号码
public void disp(){
if(count==0)
System.out.println("没有信息！");
else
for(int i=0;icount;i++){
System.out.println(data[i].getName());
System.out.println(data[i].getPhonenumber());
System.out.println(data[i].getID());
}
}
//显示菜单
public static void dispMenu(){
System.out.println("1.按姓名查找");
System.out.println("2.按ID查找");
System.out.println("3.按号码查找");
System.out.println("4.添加通讯录");
System.out.println("5.删除通讯录");
System.out.println("6.显示所有号码");
System.out.println("请输入数字：");
}
public static void main(String []arg)throws IOException{
PhoneBook phonebook=new PhoneBook();
BufferedReader readerStream=new BufferedReader(new InputStreamReader(System.in));
while(true){
PhoneBook.dispMenu();
int operater=Integer.parseInt(readerStream.readLine());
switch(operater){
case 1:{
System.out.println("请输入姓名");
String name=readerStream.readLine();
phonebook.searchByName(name);
}
break;
case 2:{
System.out.println("请输入ID");
int ID=Integer.parseInt(readerStream.readLine());
phonebook.serchByPhoneid(ID);
}
break;
case 3:{
System.out.println("请输入号码");
String phonenumber=readerStream.readLine();
phonebook.searhByPhoneNum(phonenumber);
}
break;
case 4:{
System.out.println("请输入信息");
System.out.println("请输入ID");
int ID=Integer.parseInt(readerStream.readLine());
System.out.println("请输入姓名");
String name=readerStream.readLine();
System.out.println("请输入号码");
String phonenumber=readerStream.readLine();
phonebook.addinfo(name, phonenumber, ID);
}
break;
case 5:{
System.out.println("请输入ID");
int ID=Integer.parseInt(readerStream.readLine());
phonebook.deleteinfo(ID);
}
break;
case 6:
phonebook.disp();
break;
}
}
}
}
代码基本如上，基本实现了功能，但还是有 点不足的。。
==================================
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
public class PhoneBook {
// 代表有多少条记录
private int size = 0;
// 用来记录信息的数组
private Phone[] phones = new Phone[100];
private String filename = "phonebook.txt";
public PhoneBook() {
try {
read();
} catch (IOException e) {
}
}
private void read() throws IOException {
File f = new File(filename);
if (!f.exists()) {
return;
}
BufferedReader br = new BufferedReader(new FileReader(filename));
String line = null;
while ((line = br.readLine()) != null) {
if (line.trim().length() 0) {
Phone phone = new Phone(line);
addPhone(phone);
}
}
br.close();
}
public void store() throws IOException {
File f = new File(filename);
BufferedWriter bw = new BufferedWriter(new FileWriter(filename));
for (Phone phone : phones) {
if (phone == null) {
continue;
}
String str = phone.name + "::" + phone.number + "::" + phone.notes;
bw.write(str + "\r\n");
}
bw.close();
}
public void addPhone(Phone phone) {
phones[size++] = phone;
}
public Phone getPhone(String name) {
for (Phone phone : phones) {
if (phone == null) {
continue;
}
if (phone.name.equalsIgnoreCase(name)) {
return phone;
}
}
return null;
}
public Phone[] getPhones() {
return phones;
}
}
class Phone {
String name, number, notes;
public Phone() {
}
public Phone(String line) {
String[] strs = line.split("::");
name = strs[0];
number = strs[1];
notes = strs[2];
}
public String toString() {
return String.format("-- %s\r\n-- %s\r\n-- %s", name, number, notes);
}
}
=================================================
import java.io.IOException;
import java.util.Scanner;
public class MainClass {
private static PhoneBook book = new PhoneBook();
public static void main(String[] args) {
getCommand();
}
public static void getCommand() {
String cmd = getString("Command: ");
if (cmd.startsWith("e ")) {
add(cmd.substring(cmd.indexOf(' ') + 1));
try {
book.store();// 添加一个就记录一次文件
} catch (IOException e) {
e.printStackTrace();
}
} else if (cmd.startsWith("f ")) {
find(cmd.substring(cmd.indexOf(' ') + 1));
} else if (cmd.equals("l")) {
list();
} else if (cmd.startsWith("q")) {
quit();
} else {
System.out.println("unknown command!");
}
getCommand();
}
public static void add(String name) {
Phone phone = new Phone();
phone.name = convert(name);// 名字转换
phone.number = getString("Enter number: ");
phone.notes = getString("Enter notes: ");
book.addPhone(phone);
}
public static void find(String name) {
Phone phone = book.getPhone(name);
if (phone != null) {
System.out.println(phone);
} else {
System.out.println("** No entry with code " + name);
}
}
public static void list() {
for (Phone phone : book.getPhones()) {
if (phone != null) {
System.out.println(phone);
}
}
}
public static void quit() {
try {
book.store();
} catch (IOException e) {
}
System.exit(0);
}
public static String getString(String tip) {
System.out.print(tip);
Scanner sc = new Scanner(System.in);
return sc.nextLine();
}
private static String convert(String name) {
if (name != null name.length() 0) {
return name.substring(0, 1).toUpperCase()
+ name.substring(1).toLowerCase();
}
return null;
}
}