189 8069 5689
具体方法如下：
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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);
}
}
20分！！！？？(⊙o⊙)
给你这个做参考吧。自己改一下就行了。（共两个文件）
//ChatClient.java
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
public class ChatClient extends Frame {
Socket s = null;
DataOutputStream dos = null;
DataInputStream dis = null;
private boolean bConnected = false;
TextField tfTxt = new TextField();
TextArea taContent = new TextArea();
Thread tRecv = new Thread(new RecvThread());
public static void main(String[] args) {
new ChatClient().launchFrame();
}
public void launchFrame() {
setLocation(400, 300);
this.setSize(300, 300);
add(tfTxt, BorderLayout.SOUTH);
add(taContent, BorderLayout.NORTH);
pack();
this.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent arg0) {
disconnect();
System.exit(0);
}
});
tfTxt.addActionListener(new TFListener());
setVisible(true);
connect();
tRecv.start();
}
public void connect() {
try {
s = new Socket("127.0.0.1", 8888);
dos = new DataOutputStream(s.getOutputStream());
dis = new DataInputStream(s.getInputStream());
System.out.println("connected!");
bConnected = true;
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public void disconnect() {
try {
dos.close();
dis.close();
s.close();
} catch (IOException e) {
e.printStackTrace();
}
/*
try {
bConnected = false;
tRecv.join();
} catch(InterruptedException e) {
e.printStackTrace();
} finally {
try {
dos.close();
dis.close();
s.close();
} catch (IOException e) {
e.printStackTrace();
}
}
*/
}
private class TFListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
String str = tfTxt.getText().trim();
//taContent.setText(str);
tfTxt.setText("");
try {
//System.out.println(s);
dos.writeUTF(str);
dos.flush();
//dos.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
private class RecvThread implements Runnable {
public void run() {
try {
while(bConnected) {
String str = dis.readUTF();
//System.out.println(str);
taContent.setText(taContent.getText() + str + '\n');
}
} catch (SocketException e) {
System.out.println("退出了，bye!");
} catch (EOFException e) {
System.out.println("推出了，bye - bye!");
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
//ChatServer.java
import java.io.*;
import java.net.*;
import java.util.*;
public class ChatServer {
boolean started = false;
ServerSocket ss = null;
ListClient clients = new ArrayListClient();
public static void main(String[] args) {
new ChatServer().start();
}
public void start() {
try {
ss = new ServerSocket(8888);
started = true;
} catch (BindException e) {
System.out.println("端口使用中....");
System.out.println("请关掉相关程序并重新运行服务器！");
System.exit(0);
} catch (IOException e) {
e.printStackTrace();
}
try {
while(started) {
Socket s = ss.accept();
Client c = new Client(s);
System.out.println("a client connected!");
new Thread(c).start();
clients.add(c);
//dis.close();
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
ss.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
class Client implements Runnable {
private Socket s;
private DataInputStream dis = null;
private DataOutputStream dos = null;
private boolean bConnected = false;
public Client(Socket s) {
this.s = s;
try {
dis = new DataInputStream(s.getInputStream());
dos = new DataOutputStream(s.getOutputStream());
bConnected = true;
} catch (IOException e) {
e.printStackTrace();
}
}
public void send(String str) {
try {
dos.writeUTF(str);
} catch (IOException e) {
clients.remove(this);
System.out.println("对方退出了！我从List里面去掉了！");
//e.printStackTrace();
}
}
public void run() {
try {
while(bConnected) {
String str = dis.readUTF();
System.out.println(str);
for(int i=0; iclients.size(); i++) {
Client c = clients.get(i);
c.send(str);
//System.out.println(" a string send !");
}
/*
for(IteratorClient it = clients.iterator(); it.hasNext(); ) {
Client c = it.next();
c.send(str);
}
*/
/*
IteratorClient it = clients.iterator();
while(it.hasNext()) {
Client c = it.next();
c.send(str);
}
*/
}
} catch (EOFException e) {
System.out.println("Client closed!");
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if(dis != null) dis.close();
if(dos != null) dos.close();
if(s != null) {
s.close();
//s = null;
}
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
}
}
楼上应该放出答案了，我这里只是用其他界面显示，不懂Swing的可以略过，（代码比较粗略，不一定符合规范，照搬需谨慎）
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class Demo extends JFrame {
ListString pnos = new ArrayListString();
public static void main(String[] args) {
new Demo();
}
public Demo() {
StringBuffer sb = new StringBuffer("htmlbody");
while (pnos.size() 15) {// "随机"生成电话号码，可以不理他
String telString = getRandomTel();
if (!pnos.contains(telString)) {
pnos.add(telString);
sb.append(telString);
if (pnos.size() % 3 == 0) {
sb.append("br/");
} else if (pnos.size() 15) {
sb.append(",");
}
}
}
sb.append("/body/html");
JLabel label = new JLabel(sb.toString());
final JTextField input = new JTextField();
final JLabel result = new JLabel();
this.setLayout(new GridLayout(3, 1));
this.add(label);
this.add(input);
this.add(result);
this.setSize(new Dimension(300, 500));
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setLocationRelativeTo(null);
this.setVisible(true);
input.addKeyListener(new KeyAdapter() {
@Override
public void keyReleased(KeyEvent keyevent) {
result.setText(getMatchNo(input.getText()));
}
});
}
/**
*
* @param perfix
* @return
*/
public String getMatchNo(String perfix) {
StringBuffer sb = new StringBuffer("htmlbody");
if (perfix != null !perfix.trim().equals(""))
for (String string : pnos) {// 这里是你要的部分，遍历“号码本”匹配是否为输入数字的开头
if (string.startsWith(perfix)) {
sb.append(string).append("br/");
}
}
sb.append("/body/html");
return sb.toString();
}
private static String[] telFirst = "134,135,136,137,138,139,150,151,152,157,158,159,130,131,132,155,156,133,153"
.split(",");
private static String getRandomTel() {
int index = getNum(0, telFirst.length - 1);
String first = telFirst[index];
String second = String.valueOf(getNum(1, 888) + 10000).substring(1);
String thrid = String.valueOf(getNum(1, 9100) + 10000).substring(1);
return first + second + thrid;
}
public static int getNum(int start, int end) {
return (int) (Math.random() * (end - start + 1) + start);
}
}
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] = "";
}
}
这里有一个简单的模拟通讯 要先运行服务器端 再运行客户端 否则会报错：
服务器端代码：
package com.test3;
import java.net.*;
import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Server2 extends JFrame implements ActionListener , KeyListener {
JTextArea jta=null;
JScrollPane jsp=null;
JTextField jtf=null;
JButton jb=null;
JPanel jp=null;
InputStreamReader isr=null;
BufferedReader br=null;
PrintWriter pw=null;
Socket s;
String jtatext="";
public static void main(String[] args) {
// TODO Auto-generated method stub
Server2 sv2=new Server2();
}
public Server2(){
jta=new JTextArea();
jta.setEditable(false);
jsp=new JScrollPane(jta);
jtf=new JTextField(10);
jtf.addKeyListener(this);
jb=new JButton("发送");
jb.addActionListener(this);
jp=new JPanel();
jp.add(jtf);
jp.add(jb);
this.add(jsp,"Center");
this.add(jp,"South");
this.setSize(300,300);
this.setLocationRelativeTo(this);
this.setTitle("服务器端");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
try{
ServerSocket ss=new ServerSocket(9999);
s=ss.accept();
isr=new InputStreamReader(s.getInputStream());
br=new BufferedReader(isr);
pw=new PrintWriter(s.getOutputStream(),true);
while(true){
String info=br.readLine();
jta.append("客户端对服务器说： "+info+"\r\n");
// this.jta.setText(jtatext);
}
}catch(Exception e){
e.printStackTrace();
}
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource()==jb){
try {
pw.println(jtf.getText());
jta.append("服务器对客户端说： "+jtf.getText()+"\r\n");
// jta.setText(jtatext);
jtf.setText("");
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}
@Override
public void keyTyped(KeyEvent e) {}
@Override
public void keyPressed(KeyEvent e) {
if(e.getKeyCode()==KeyEvent.VK_ENTER){
try {
pw.println(jtf.getText());
jta.append("服务器对客户端说： "+jtf.getText()+"\r\n");
jtf.setText("");
} catch (Exception e1) {
e1.printStackTrace();
}
}
}
@Override
public void keyReleased(KeyEvent e) {}
}
客户端代码：
package com.test3;
import java.net.*;
import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Client2 extends JFrame implements ActionListener ,KeyListener {
JTextArea jta=null;
JScrollPane jsp=null;
JTextField jtf=null;
JButton jb=null;
JPanel jp=null;
String jtatext="";
Socket s;
PrintWriter pw=null;
InputStreamReader isr=null;
BufferedReader br=null;
public static void main(String[] args) {
// TODO Auto-generated method stub
Client2 sv2=new Client2();
}
public Client2(){
jta=new JTextArea();
jta.setEditable(false);
jsp=new JScrollPane(jta);
jtf=new JTextField(10);
jtf.addKeyListener(this);
jb=new JButton("发送");
jb.addActionListener(this);
jp=new JPanel();
jp.add(jtf);
jp.add(jb);
this.add(jsp,"Center");
this.add(jp,"South");
this.setSize(300,300);
this.setLocationRelativeTo(this);
this.setTitle("客户端");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
try {
s=new Socket("127.3.3.3",9999);
isr=new InputStreamReader(s.getInputStream());
br=new BufferedReader(isr);
pw=new PrintWriter(s.getOutputStream(),true);
while(true){
String info=br.readLine();
jta.append("服务器对客户端说： "+info+"\r\n");
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource()==jb){
try {
pw.println(this.jtf.getText());
jta.append("客户端对服务器说： "+jtf.getText()+"\r\n");
jtf.setText("");
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}
public void keyTyped(KeyEvent e) {}
public void keyPressed(KeyEvent e) {
if(e.getKeyCode()==KeyEvent.VK_ENTER){
try {
pw.println(this.jtf.getText());
jta.append("客户端对服务器说： "+jtf.getText()+"\r\n");
jtf.setText("");
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}
public void keyReleased(KeyEvent e) {}
}