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新しいオブジェクトインスタンスを作成せずにあるクラスから別のクラスに変数値を渡す方法はありますか？ 基本的には、私はこれらのクライアントとサーバーのクラスを持っており、それぞれのユーザーが "sendToAll"サーバーメソッドで認識できるように、クライアントのユーザー名の値をサーバークラスに転送したいと考えています。あるクラスから別のクラスへの変数値の受け渡し
Clientクラス：
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package chat;
import java.io.*;
import java.net.*;
import javax.swing.JOptionPane;
/**
*
* @author Allura
*/
public class ChatClient extends javax.swing.JFrame {
BufferedReader reader;
PrintWriter writer;
String username;
/**
* Creates new form ChatClient
*/
public ChatClient() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jScrollPane1 = new javax.swing.JScrollPane();
messageBox = new javax.swing.JTextArea();
inputBox = new javax.swing.JTextField();
sendButton = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
messageBox.setEditable(false);
messageBox.setColumns(20);
messageBox.setRows(5);
jScrollPane1.setViewportView(messageBox);
sendButton.setText("Send");
sendButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
sendButtonActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(inputBox, javax.swing.GroupLayout.PREFERRED_SIZE, 462, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(sendButton, javax.swing.GroupLayout.DEFAULT_SIZE, 118, Short.MAX_VALUE))
.addComponent(jScrollPane1))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 353, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(inputBox)
.addComponent(sendButton, javax.swing.GroupLayout.DEFAULT_SIZE, 31, Short.MAX_VALUE))
.addContainerGap(23, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void sendButtonActionPerformed(java.awt.event.ActionEvent evt) {
if(!inputBox.getText().equals(""))
{
try
{
writer.println(inputBox.getText());
writer.flush();
}
catch(Exception ex)
{
ex.printStackTrace();
}
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
ChatClient client = new ChatClient();
client.go();
}
public void go()
{
username = JOptionPane.showInputDialog(this, "Enter a username: ");
setUpNetwork();
setVisible(true);
Thread myRunner = new Thread(new MessageReader());
myRunner.start();
}
public void setUpNetwork()
{
try
{
Socket sock = new Socket("0.0.0.0", 5000);
InputStreamReader input = new InputStreamReader(sock.getInputStream());
reader = new BufferedReader(input);
writer = new PrintWriter(sock.getOutputStream());
System.out.println("Connection established.");
}
catch(IOException ex)
{
ex.printStackTrace();
}
}
public class MessageReader implements Runnable
{
String message;
public void run()
{
try
{
while ((message = reader.readLine()) != null)
{
messageBox.append(message + "\n");
}
}
catch(Exception ex)
{
ex.printStackTrace();
}
}
}
// Variables declaration - do not modify
private javax.swing.JTextField inputBox;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextArea messageBox;
private javax.swing.JButton sendButton;
// End of variables declaration
}Serverクラス：
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package chat;
import java.net.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
/**
*
* @author Allura
*/
public class ChatServer extends JFrame {
ArrayList StreamOutput;
Socket mainSocket;
public class ClientHandler implements Runnable
{
Socket sock;
BufferedReader reader;
public ClientHandler(Socket clientSock)
{
try
{
sock = clientSock;
InputStreamReader input = new InputStreamReader(sock.getInputStream());
reader = new BufferedReader(input);
}
catch(Exception ex)
{
ex.printStackTrace();
}
}
public void run()
{
String message;
try
{
while((message = reader.readLine()) != null)
{
sendToAll(message);
}
}
catch(Exception ex)
{
ex.printStackTrace();
}
}
}
public static void main(String[] args)
{
new ChatServer().go();
}
public void go()
{
StreamOutput = new ArrayList();
try
{
ServerSocket serverSock = new ServerSocket(5000);
while(true)
{
mainSocket = serverSock.accept();
PrintWriter writer = new PrintWriter(mainSocket.getOutputStream());
StreamOutput.add(writer);
System.out.println("Request from client accepted. Connection established.");
Thread myRunner = new Thread(new ClientHandler(mainSocket));
myRunner.start();
}
}
catch(Exception ex)
{
ex.printStackTrace();
}
}
public void sendToAll(String message)
{
Iterator it = StreamOutput.iterator();
while(it.hasNext())
{
try
{
PrintWriter writer = (PrintWriter) it.next();
writer.println(message);
writer.flush();
}
catch(Exception ex)
{
ex.printStackTrace();
}
}
}
}
この種類は、プログラムの構造によって異なります。 –
通常、ソケットを介したネットワーク経由のサーバー/クライアントの関係 – zapl
公開されたサーバーとクライアントのコード。助けを歓迎する –