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import java.util.Arrays;
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public class AddressBook
{
private int totalContacts; // 现在通讯录中的总数
private int maxContacts; // 通讯录的最大值
private Contact[] contacts; // 通讯录的array
/**
* Constructor. 设定这个通讯录最初的大小为10人上限.
*/
public AddressBook()
{
totalContacts = 0;
maxContacts = 10;
contacts = new Contact[totalContacts];
}
/**
* 得到一旦笑个联系通过通讯录中的名字
*
* @param name
* 要去得到的联系人名字
* @return 这个联系人, 没有的话为null
*/
public Contact getContactByName(String name)
{
for(int i = 0; i totalContacts; i++)
{
Contact c = contacts[i];
if(name.equals(c.getName()))
{
return c;
}
}
return null;
}
/**
* 在这答森个contacts array的模举含最后给这个通讯录添加联系人.
* 如果联系人已经存在且号码参数不为0的话,联系人的号码会更新或者地址参数不是null的话,地址会更新。.
* 如果totalContacts达到maxContacts的值的话,在新的联系人被添加前,这个contacts
* array的size会乘以双倍并且maxContacts也乘以双倍。
*
* @param contact
* 要加到这个通讯录的联系人
* @return true 如果这个联系人添加成功, 否则 false;
*/
public boolean addContact(Contact contact)
{
for(int i = 0; i contacts.length; i++)
{
Contact ct = contacts[i];
if(ct.equals(contact))
{
if(ct.getNumber() != 0)
{
ct.setNumber(contact.getNumber());
}
if(null != ct.getAddress())
{
ct.setAddress(contact.getAddress());
}
return true;
}
}
if(totalContacts == maxContacts)
{
totalContacts *= 2;
maxContacts *= 2;
}
Contact[] cs = new Contact[totalContacts + 1];
System.arraycopy(contacts, 0, cs, 0, totalContacts);
cs[cs.length - 1] = contact;
contacts = cs;
totalContacts++;
return true;
}
/**
* 检查是否联系人已经存在
*
* @param contact
* 要去检查的contact
* @return true 如果这个联系人被找到,否则false
*/
public boolean contains(Contact contact)
{
for(int i = 0; i totalContacts; i++)
{
if(contacts[i].equals(contact))
{
return true;
}
}
return false;
}
public void printAddressBook()
{
for(int i = 0; i totalContacts; i++)
{
System.out.println(contacts[i]);
}
}
/**
* 在AddressBook中还有一个方法!
* 从通讯录中移除一个指定的联系人,之后把其他的入口左移,这样在联系人间就没有空隙了,
* For example:
* before - {C1, C2, C3, C4, C5, C6, C7, C8, C9, null} remove C6
* after - {C1, C2, C3, C4, C5, C7, C8, C9, null, null}
*
* @param contact
* 要移除的联系人,
* @return true 如果这个联系人被成功移除了,否则false；
*/
public boolean removeContact(Contact contact)
{
if(totalContacts == 0)
{
return false;
}
for(int i = 0; i totalContacts; i++)
{
Contact ct = contacts[i];
if(ct.equals(contact))
{
Contact[] cs = new Contact[totalContacts];
System.arraycopy(contacts, 0, cs, 0, i);
System.arraycopy(contacts, i + 1, cs, i, cs.length - i - 1);
contacts = cs;
totalContacts--;
return true;
}
}
return false;
}
@Override
public String toString()
{
return String.format("AddressBook [totalContacts=%s, maxContacts=%s, contacts=%s]", totalContacts, maxContacts,
Arrays.toString(contacts));
}
}
//--------------------------------------------------
public class Contact
{
private String name;
private long number;
private String address;
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}
public long getNumber()
{
return number;
}
public void setNumber(long number)
{
this.number = number;
}
public String getAddress()
{
return address;
}
public void setAddress(String address)
{
this.address = address;
}
@Override
public boolean equals(Object obj)
{
if(!(obj instanceof Contact))
{
return false;
}
Contact contact = (Contact) obj;
if(this.getName().equals(contact.getName())
this.getAddress().equals(contact.getAddress())
this.getNumber() == contact.getNumber())
{
return true;
}
return false;
}
@Override
public String toString()
{
return String.format("Contact [name=%s, number=%s, address=%s]", name, number, address);
}
}
//---------------------------------------------
public class Test
{
public static void main(String[] args)
{
AddressBook ab = new AddressBook();
for(int i = 0; i 10; i++)
{
Contact contact = new Contact();
int x = i + 1;
contact.setName("C" + x);
contact.setAddress("china");
contact.setNumber(x);
ab.addContact(contact);
}
System.out.println(ab);
Contact c = new Contact();
c.setName("C6");
c.setAddress("china");
c.setNumber(6);
ab.removeContact(c);
System.out.println(ab);
}
}
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、完成孙乱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("请输入芦弊你得选择：(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 + "条则哗档记录");
}
} 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);
}
}
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("文件存悉谨储路径：碧空");
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("睁慧基文件不存在");
}
} 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] = "";
}
}