Here I have a question which is If I pre-set JTextField
value to "test" that when I clicked the button that can return "test".
But when I changed the value (By user input) such as "BUG", then clicked the button again, it returns "test" also.
The code set PortTextField.setText("9999");
And then I tried to input 8888
on this field, then click the button, it print 9999
by getText
from PortTextField
The JTextField
value seems doesn't update
Server.java: (Part of Code)
public boolean PortisInteger(String value) {
try {
this.portNumber = Integer.parseInt(value);
return true;
} catch(NumberFormatException ex) {
System.out.println(ex);
return false;
}
}
@Override
public void actionPerformed(ActionEvent e) {
Object scr = e.getActionCommand();
if (scr.equals("Start") && (serverSocket == null || serverSocket.isClosed())) {
// new JFrame().StartServerToggleButton.setEnabled(false);
if(PortisInteger(**new JFrame().getPortTextField()**)) {
if(ServerStart(portNumber)) {
new JFrame().setIPLabel("IP: " + serverSocket.getInetAddress().getHostName());
}
}
}
JFrame.java:
package Server;
public class JFrame extends javax.swing.JFrame {
public JFrame() {
initComponents();
Server svr = new Server();
StartServerToggleButton.addActionListener(svr);
CloseServerToggleButton.addActionListener(svr);
}
public void setIPLabel(String IPString) {
IPLabel.setText(IPString);
}
**public String getPortTextField() {
return PortTextField.getText().trim();
}**
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
PortTextField = new javax.swing.JTextField();
PortLabel = new javax.swing.JLabel();
jScrollPane1 = new javax.swing.JScrollPane();
MessageTextArea = new javax.swing.JTextArea();
StartServerToggleButton = new javax.swing.JToggleButton();
CloseServerToggleButton = new javax.swing.JToggleButton();
IPLabel = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("Chatroom-Server");
PortTextField.setFont(new java.awt.Font("Harlow Solid Italic", 0, 18)); // NOI18N
PortTextField.setText("9999");
PortLabel.setFont(new java.awt.Font("Harlow Solid Italic", 0, 18)); // NOI18N
PortLabel.setText("Port:");
MessageTextArea.setEditable(false);
MessageTextArea.setColumns(20);
MessageTextArea.setFont(new java.awt.Font("Harlow Solid Italic", 0, 18)); // NOI18N
MessageTextArea.setRows(5);
jScrollPane1.setViewportView(MessageTextArea);
StartServerToggleButton.setFont(new java.awt.Font("Harlow Solid Italic", 0, 18)); // NOI18N
StartServerToggleButton.setText("Start");
CloseServerToggleButton.setFont(new java.awt.Font("Harlow Solid Italic", 0, 18)); // NOI18N
CloseServerToggleButton.setText("Close");
IPLabel.setFont(new java.awt.Font("Harlow Solid Italic", 0, 18)); // NOI18N
IPLabel.setText("IP: 0.0.0.0");
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)
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 459, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addComponent(IPLabel, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(PortLabel)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(PortTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 80, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(16, 16, 16)
.addComponent(StartServerToggleButton, javax.swing.GroupLayout.PREFERRED_SIZE, 100, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(CloseServerToggleButton, javax.swing.GroupLayout.PREFERRED_SIZE, 100, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(PortTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 23, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(StartServerToggleButton)
.addComponent(CloseServerToggleButton)
.addComponent(PortLabel)
.addComponent(IPLabel))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 250, Short.MAX_VALUE)
.addContainerGap())
);
pack();
}// </editor-fold>
public static void main(String args[]) {
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(JFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new JFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
public javax.swing.JToggleButton CloseServerToggleButton;
public javax.swing.JLabel IPLabel;
public javax.swing.JTextArea MessageTextArea;
public javax.swing.JLabel PortLabel;
public javax.swing.JTextField PortTextField;
public javax.swing.JToggleButton StartServerToggleButton;
private javax.swing.JScrollPane jScrollPane1;
// End of variables declaration
}
You are making a mistake by creating a new instance of JFrame every time you get the portTextField so it's normal to receive it's initial value. You have to get a reference of the running instance of your JFrame.
The reason you do not get the user input is because of this code:
if(PortisInteger(new JFrame().getPortTextField())) {
You are creating a new JFrame instance every time the above code is executed. This refers to a different instance of the JFrame and not the one which has the JTextField that contains the user input.
I suggest you do the following:
Add this before your Server constructor in Server.java
private JFrame frame;
Add this inside your Server constructor in Server.java
frame = new JFrame();
Modify the actionPerformed method in Server.java to:
public void actionPerformed(ActionEvent e) {
Object scr = e.getActionCommand();
if (scr.equals("Start") && (serverSocket == null || serverSocket.isClosed())) {
// new JFrame().StartServerToggleButton.setEnabled(false);
if(PortisInteger(frame.getPortTextField())) {
if(ServerStart(portNumber)) {
frame.setIPLabel("IP: " + serverSocket.getInetAddress().getHostName());
}
}
}
Hope this helps. Good luck and have fun programming!
Cheers,
Lofty
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