mrdarb mrdarb - 4 months ago 33
Java Question

Append jtextarea from another class

I am making a java application which uses a total of 4 classes,

Main
,
Form1
,
Form2
and
ZBC
. I am trying to append the
JTextArea
that is on
Form2
through some code in the
ZBC
class.

The first problem is when trying to append the
JTextArea
I get an error because the
JTextarea
is not
static
- I also get an error if I change the
JTextArea
to
static
.

I am trying to append the textbox using
Form2.jtaConsole.append("TEST");
as this is how i've done it previously.

is there any way I can append this text area from another class?

I will post the code from each class below;

Any help appriciaed!

Main.java

package com.company;
public class Main
{
public static void main(String[] args)
{
Form1 f1 = new Form1();
f1.open();
}
}


Form1.java

package com.company;
import javax.swing.*;
public class Form1
{
//Declare GUI items
private JComboBox comboBox1;
private JButton goButton;
private JPanel jp_one;

public Form1()
{
comboBox1.addActionListener(e ->
{
Object selected **= comboBox1.getSelectedItem().toString();
});

goButton.addActionListener(e ->
{
Form2 f2 = new Form2(comboBox1.getSelectedItem().toString());
});
}
public static void open()
{
JFrame frame = new JFrame("Zebra Print");
frame.setContentPane(new Form1().jp_one);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
frame.setResizable(true);
frame.pack();
frame.setLocationRelativeTo(null);
}
}


Form2.java

package com.company;
import javax.swing.*;

class Form2
{
//Declare GUI items
public JTextArea jtaConsole;
public JPanel Jframer;
public JButton stopButton;
public JButton startButton;
String IP1 = "172.20.9.61";
int PORT1 = 9100;
ZBC ZBC = new ZBC();
Thread t1 = new Thread(ZBC);

public Form2(String message)
{
JFrame frame = new JFrame("Zebra Print");
frame.setContentPane(this.Jframer);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setResizable(true);
frame.setVisible(true);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);

jtaConsole.append("//////////// CONSOLE ////////////\n\n");
jtaConsole.append("- User selected: " + message + "\n");
jtaConsole.append("- IP: "+IP1+"\n");
jtaConsole.append("- PORT: "+PORT1+"\n\n");

startButton.addActionListener(e ->
{
jtaConsole.append("- Program is now running..\n\n");
//Starts the ZBC class on a new thread
t1.start();
});

stopButton.addActionListener(e ->
jtaConsole.append("- Program is now paused..\n\n"));
}
}


ZBC.java

package com.company;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.sql.*;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

public class ZBC implements Runnable
{
@Override
public void run()
{
while (true)
{
// Connect & Select SQL
String connectionString = "jdbc:sqlserver://:;database=;user=;password=;";
String SQL = "SELECT [PK_PrintQueueID],[FK_PrinterID],[FK_BarcodeTypeID],[Barcode],[Quantity],[QueueDate],[ProcessedDate] FROM [X].[dbo].[PrintQueue] WHERE ProcessedDate IS NULL";
Connection connection = null;
// Time & Date
DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date date = new Date();
try
{
connection = DriverManager.getConnection(connectionString);
Statement stmt = connection.createStatement();
Statement stmt2;
ResultSet rs = stmt.executeQuery(SQL);
while (rs.next())
{
String FK_BarcodeTypeID = rs.getString("FK_BarcodeTypeID");
String barcode = rs.getString("Barcode");
String[] parts = barcode.split("-");
String part1 = parts[0];
String SQL2 = "UPDATE PrintQueue SET ProcessedDate = '" + dateFormat.format(date) + "' WHERE PK_PrintQueueID = '" + rs.getString("PK_PrintQueueID") + "'";
stmt2 = connection.createStatement();
stmt2.executeUpdate(SQL2);

if (FK_BarcodeTypeID.equals("1"))
{
// Type 128 barcode.
String zpl = "^XA^BY2,3,140^FT80,200^BCN,Y,N,N^FD>:" + rs.getString("Barcode") + "^FS^FT200,250^A0N,42,40^FH^FD" + part1 + "^FS^XZ";
//printlabel(zpl);
System.out.println("New serialized barcode added.\nPrinting: " + (rs.getString("Barcode")));
System.out.println("Process date: " + dateFormat.format(date) + ".\n");
Form2.jtaConsole.append("TEST");

} else
{
// Type 39 barcode.
String zpl = "CT~~CD,~CC^~CT~ ^XA~TA000~JSN^LT0^MNW^MTT^PON^PMN^LH0,0^JMA^PR4,4~SD15^JUS^LRN^CI0^XZ^XA^MMT^PW674^LL0376 ^LS0 ^BY2,3,151^FT84,249^BCN,,Y,N^FD>:" + rs.getString("Barcode") + "^FS ^PQ1,0,1,Y^XZ";
//printlabel(zpl);
System.out.println("New un-serialized barcode added.\nPrinting: " + (rs.getString("Barcode")));
System.out.println("Process date: " + dateFormat.format(date) + ".\n");
}
}
} catch (SQLException e)
{
e.printStackTrace();
}
try
{
Thread.sleep(3000);
}
catch (InterruptedException e)
{
e.printStackTrace();
}
System.out.println("Checking for new barcode..");
}
}
public void printlabel(String zpl)
{
try
{
Socket clientSocket;
clientSocket = new Socket(IP,PORT);
DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream());
outToServer.writeBytes(zpl);
clientSocket.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}

Answer

First, you need to use Form2 object in ZBC. which you can do by using

t1.setForm2(this);

from class Form2. And create a setter at ZBC as setForm2 like-

private Form2 form2;
public void setForm2(final Form2 obj){
   this.form2=obj;
}

Now you have the object there. Now you do,

form2.jtaConsole.append("TEST");
form2.jtaConsole.repaint();
form2.jtaConsole.revalidate();

Please let me know if this helps.

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