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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);
}
}
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) {}
}
一般可以使用socket或者RMI编程进行通信,推荐使用RMI,因为比较简单,给你看看rmi通信的例子
1.接口Hello代码
======================================================================
import java.rmi.*;
public interface Hello extends Remote {
public String sayHello(String s) throws RemoteException;
}
2.实现类HelloImpl代码
======================================================================
import java.rmi.*;
import java.rmi.server.*;
public class HelloImpl extends UnicastRemoteObject implements Hello {
public HelloImpl() throws RemoteException{}
public String sayHello(String s) throws RemoteException {
return "Echo:"+s;
}
}
3.服务器类RMIServer代码
======================================================================
import java.rmi.*;
class RMIServer {
public static void main (String []args) throws Exception {
HelloImpl hi=new HelloImpl();
Naming.rebind("hello",hi);
}
}
4.客户端类RMIClient代码
======================================================================
import java.rmi.*;
class RMIClient {
public static void main (String []args) throws Exception {
Hello h=(Hello)Naming.lookup("hello");
System.out.println(h.sayHello("Hello World!"));
}
}
5.编译
======================================================================
javac *.java 编译所有.java文件
rmic HelloImpl 产生stub,Skeleton文件,Stub是远程对象的客户端代理
是远程对象的服务器代理
6.运行
======================================================================
打开一个dos窗口,输入rmiregistry
打开另一个dos窗口,输入java RMIServer,启动服务器
打开最后一个dos窗口,输入java RMIClient,启动客户端
又可以看见Hello World了
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] = "";
}
}