GUIServer.java

import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingConstants;

public class GUIServer extends JFrame{
    public GUIServer() {
        super("Java Chat Server");
        
        // Create a TextArea object
        final JTextArea textArea = new JTextArea(5, 30);
        // Put the TextArea object in a Scrollable Pane
        JScrollPane scrollPane = new JScrollPane(textArea);
        
    
        // In order to ensure the scroll Pane object appears in user's window, 
        // set a preferred size to it.
        scrollPane.setPreferredSize(new Dimension(560, 600));
    
        // Lines will be wrapped if they are too long to fit within the 
        // allocated width
        textArea.setLineWrap(true);
    
        // Lines will be wrapped at word boundaries (whitespace) if they are 
        // too long to fit within the allocated width
        textArea.setWrapStyleWord(true);
    
        // Text area is not editable
        textArea.setEditable(false);
    
        // A vertical scroll bar on our pane, as text is added to it
        scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
    
        // add a Text Field for user input, make sure the 
        // text area stays on the last line as subsequent lines are 
        // added and auto-scrolls
        final JTextField userInputField = new JTextField(30);
        

        //add a menu bar to the top of the gui
        final JMenuBar mb;
        final JMenu x;
        final JMenuItem m1, m2;
        mb = new JMenuBar();

        //name the menu bar and the three options it will have
        x = new JMenu("Options");
        m1 = new JMenuItem("Help");
        m2 = new JMenuItem("Close Server");

        //add listener to menu items
        m1.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent event){
                textArea.append("Welcome to the java chat server." + "\n");
                textArea.append("There are also a couple different commands you can use as an admin." + "\n");
                textArea.append("/w [username] (your mesage here) will allow you to send a message to a specific user." + "\n");
                textArea.append("/all will display all the users in the chat room currently. " + "\n");
                textArea.append("Selecting Close Server will shut down the Java Chat Server and send a message to all connected users. " + "\n");
            }
        });
        //if Close Server is pressed on the menu
        m2.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent event){
                textArea.append("Close Server pressed" + "\n");
            }
        });


        //add the items create to the menu bar
        x.add(m1);
        x.add(m2);

        //add the menu bar to the entire gui and set the size
        mb.add(x);
        this.setJMenuBar(mb);
        this.setSize(500,500);
        this.setVisible(true);


        userInputField.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent event){
                //get the text from the textfield
                String fromUser = userInputField.getText();
                
                if (fromUser != null) {
                    //append the text from the user
                    textArea.append("Admin" + ":" + fromUser + "\n");
        
                    //The pane auto-scrolls with each new response added
                    textArea.setCaretPosition(textArea.getDocument().getLength());
                    //Reset the text field to "" each time the user presses Enter
                    userInputField.setText("");
                }
            }
        });

        this.setLayout(new FlowLayout());
        //adds and centers the text field to the frame
        this.add(userInputField, SwingConstants.CENTER);
        //adds and centers the scroll pane to the frame
        this.add(scrollPane, SwingConstants.CENTER);
        
        // Set size, default close operation, resizability boolean and overall contents visibility
        this.setSize(600, 700);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setResizable(true);
        this.setVisible(true);
    }

    public static void main(String[] args) {
        new GUIServer();
    }
}