Some problems with your code:
- You're setting the preferredSize of a JTextArea -- something you should never do. If you put it in a JScollPane, the text area now cannot grow if lines of text are added, and so the scrolling will be useless. This all was already stated in the comments to one of the answers to your question, but you've ignored them -- why?
- Instead set the JTextArea's columns and rows via its constructor.
- You're adding a MouseListener to a JButton, something you should almost never do. Instead use an ActionListener as the tutorials will tell you.
- You're adding the JTextArea to the JScrollPane and then re-adding the JTextArea to the JScrollPane -- why?
- You're adding the JTextArea to the GUI without the JScrollPane and then adding it to the JScrollPane -- don't do this. You must add a component to one container only. Just add it to the JScrollPane, and add the JScrollPane to the GUI, and be done with it.
- You're using a windows GUI builder tool before you understand Swing and layout managers. Don't do this. Learn to code with Swing first before misusing these tools and thereby painting yourself in a corner.
Your whole program:
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.Random;
import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.JSeparator;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.LayoutStyle.ComponentPlacement;
import javax.swing.border.EmptyBorder;
public class RateTesterWindow extends JFrame {
private JPanel contentPane;
private JTextField textField_1;
private JTextField textField;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
RateTesterWindow frame = new RateTesterWindow();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public RateTesterWindow() {
setResizable(false);
setTitle("L2PRIDE RATE TESTER v0.1");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 350, 377);
contentPane = new JPanel();
contentPane.setBackground(Color.GRAY);
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
JLabel lblRateTester = new JLabel("RATE TESTER");
lblRateTester.setFont(new Font("Tahoma", Font.BOLD, 18));
JSeparator separator = new JSeparator();
separator.setBackground(Color.BLACK);
final JLabel lblPleaseEnterRate = new JLabel("Rate:");
lblPleaseEnterRate.setFont(new Font("Tahoma", Font.BOLD, 11));
final JRadioButton rdbtnDreadItem = new JRadioButton("Dread Item");
rdbtnDreadItem.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e)
{
if (rdbtnDreadItem.isSelected())
{
textField.setText("-----");
textField.setEditable(false);
}
else
{
textField.setText("");
textField.setEditable(true);
}
}
});
rdbtnDreadItem.setToolTipText("Will use dread item chances like they are in game.");
JLabel lblScrolls = new JLabel("Scrolls:");
lblScrolls.setFont(new Font("Tahoma", Font.BOLD, 11));
final JLabel lblResults = new JLabel("ABOUT:");
lblResults.setFont(new Font("Tahoma", Font.BOLD, 12));
JSeparator separator_1 = new JSeparator();
JSeparator separator_2 = new JSeparator();
separator_2.setBackground(Color.BLACK);
JSeparator separator_3 = new JSeparator();
separator_3.setBackground(Color.LIGHT_GRAY);
textField_1 = new JTextField();
textField_1.setColumns(10);
textField = new JTextField();
textField.setColumns(10);
final JTextArea textArea = new JTextArea(10, 30);
// textArea.setPreferredSize(new Dimension(310, 325));
// textArea.setMinimumSize(new Dimension(310, 325));
textArea.setEditable(false);
textArea.setFont(new Font("Tahoma", Font.PLAIN, 11));
textArea.setText("some info");
final JScrollPane scrollPane = new JScrollPane(textArea);
scrollPane.setVisible(false);
JButton btnNewButton = new JButton("RUN!");
btnNewButton.addMouseListener(new MouseAdapter()
{
@Override
public void mouseClicked(MouseEvent e)
{
lblResults.setText("RESULTS:");
if ((!rdbtnDreadItem.isSelected() && !isNumeric(textField.getText())) || !isNumeric(textField_1.getText()) || textField.getText().startsWith("0") || textField_1.getText().startsWith("0") || textField.getText().equals("100"))
{
textArea.setText("Rate and scrolls must be valid numbers.");
}
else
{
textArea.setText(doYourMagic(rdbtnDreadItem.isSelected() ? 60 : Integer.parseInt(textField.getText()), Integer.parseInt(textField_1.getText()), rdbtnDreadItem.isSelected()));
// scrollPane.setViewportView(textArea);
scrollPane.setVisible(true);
}
}
});
GroupLayout gl_contentPane = new GroupLayout(contentPane);
gl_contentPane.setHorizontalGroup(
gl_contentPane.createParallelGroup(Alignment.TRAILING)
.addComponent(separator, GroupLayout.DEFAULT_SIZE, 343, Short.MAX_VALUE)
.addGroup(gl_contentPane.createSequentialGroup()
.addGap(185)
.addComponent(separator_1, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
.addContainerGap(158, Short.MAX_VALUE))
.addGroup(gl_contentPane.createSequentialGroup()
.addGap(103)
.addComponent(lblRateTester)
.addContainerGap(120, Short.MAX_VALUE))
.addGroup(gl_contentPane.createSequentialGroup()
.addGap(30)
.addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING)
.addGroup(gl_contentPane.createSequentialGroup()
.addComponent(lblPleaseEnterRate)
.addPreferredGap(ComponentPlacement.RELATED)
.addComponent(textField, GroupLayout.PREFERRED_SIZE, 24, GroupLayout.PREFERRED_SIZE)
.addGap(16)
.addComponent(lblScrolls)
.addPreferredGap(ComponentPlacement.RELATED)
.addComponent(textField_1, GroupLayout.PREFERRED_SIZE, 30, GroupLayout.PREFERRED_SIZE)
.addGap(18)
.addComponent(rdbtnDreadItem))
.addComponent(separator_3, GroupLayout.PREFERRED_SIZE, 272, GroupLayout.PREFERRED_SIZE))
.addContainerGap(41, Short.MAX_VALUE))
.addGroup(gl_contentPane.createSequentialGroup()
.addGap(135)
.addComponent(btnNewButton)
.addContainerGap(151, Short.MAX_VALUE))
.addGroup(gl_contentPane.createSequentialGroup()
.addContainerGap()
.addComponent(separator_2, GroupLayout.PREFERRED_SIZE, 309, GroupLayout.PREFERRED_SIZE)
.addContainerGap(24, Short.MAX_VALUE))
.addGroup(gl_contentPane.createSequentialGroup()
.addGap(136)
.addComponent(lblResults)
.addContainerGap(162, Short.MAX_VALUE))
.addGroup(Alignment.LEADING, gl_contentPane.createSequentialGroup()
.addContainerGap()
.addComponent(textArea, GroupLayout.PREFERRED_SIZE, 299, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(ComponentPlacement.RELATED, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(scrollPane, GroupLayout.PREFERRED_SIZE, 16, GroupLayout.PREFERRED_SIZE)
.addContainerGap())
);
gl_contentPane.setVerticalGroup(
gl_contentPane.createParallelGroup(Alignment.LEADING)
.addGroup(gl_contentPane.createSequentialGroup()
.addComponent(lblRateTester)
.addPreferredGap(ComponentPlacement.RELATED)
.addComponent(separator, GroupLayout.PREFERRED_SIZE, 22, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(ComponentPlacement.RELATED)
.addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING)
.addComponent(lblPleaseEnterRate)
.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
.addComponent(lblScrolls, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(textField, GroupLayout.PREFERRED_SIZE, 14, GroupLayout.PREFERRED_SIZE))
.addComponent(textField_1, GroupLayout.PREFERRED_SIZE, 14, GroupLayout.PREFERRED_SIZE)
.addComponent(rdbtnDreadItem, GroupLayout.PREFERRED_SIZE, 14, GroupLayout.PREFERRED_SIZE))
.addGap(18)
.addComponent(separator_3, GroupLayout.PREFERRED_SIZE, 2, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(ComponentPlacement.UNRELATED)
.addComponent(btnNewButton)
.addPreferredGap(ComponentPlacement.UNRELATED)
.addComponent(separator_2, GroupLayout.PREFERRED_SIZE, 2, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(ComponentPlacement.RELATED)
.addComponent(lblResults)
.addPreferredGap(ComponentPlacement.RELATED)
.addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING)
.addGroup(gl_contentPane.createSequentialGroup()
.addComponent(textArea, GroupLayout.PREFERRED_SIZE, 163, GroupLayout.PREFERRED_SIZE)
.addGap(18)
.addComponent(separator_1, GroupLayout.PREFERRED_SIZE, 2, GroupLayout.PREFERRED_SIZE))
.addComponent(scrollPane, GroupLayout.PREFERRED_SIZE, 163, GroupLayout.PREFERRED_SIZE)))
);
contentPane.setLayout(gl_contentPane);
}
private String doYourMagic(int rate, int scrolls, boolean dread)
{
int success = 0;
int row = 0, highRow = 0;
String magic = "";
Random rand = new Random();
for (int i = 0; i < scrolls; i++)
{
int chance = rand.nextInt(99);
if (dread && row > 0)
rate = rate - (5 * row);
if (chance >= rate)
{
row = 0;
}
else
{
success++;
if (++row > highRow)
highRow = row;
}
magic = magic + "SCROLL USED: <--- Roll: " + chance + " <--- Scroll Rate: " + rate + "% <--- " + (row > 0 ? "Success" : "Fail") + "\r\n";
if (dread) // reset dread rate
rate = 60;
}
magic = magic + "\r\n~~~~ TEST RESULTS OF " + rate + "% RATE USING " + scrolls + " SCROLLS ~~~~\r\n";
magic = magic + "Total Success: " + success + "\r\n";
magic = magic + "Highest Success Row: " + highRow + "\r\n";
return magic;
}
private boolean isNumeric(String str)
{
try
{
Integer.parseInt(str);
}
catch (NumberFormatException nfe)
{
return false;
}
return true;
}
}
Edit
An example sscce that displays a JTextArea in a GUI that uses much simpler layouts:
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class ScrollPaneEg {
public static final String LOREM_IPSUM = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, "
+ "sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, "
+ "quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. "
+ "Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. "
+ "Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. ";
public static void main(String[] args) {
final JTextArea textarea = new JTextArea(10, 30);
textarea.setWrapStyleWord(true);
textarea.setLineWrap(true);
textarea.setEditable(false);
textarea.setFocusable(false);
JScrollPane scrollpane = new JScrollPane(textarea);
scrollpane
.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
JPanel topPanel = new JPanel();
topPanel.add(scrollpane);
topPanel.add(new JButton(new AbstractAction("Press Me") {
@Override
public void actionPerformed(ActionEvent e) {
for (int i = 0; i < 200; i++) {
textarea.append(LOREM_IPSUM);
}
}
}));
JPanel mainPanel = new JPanel(new BorderLayout(4, 4));
mainPanel.setBorder(BorderFactory.createEmptyBorder(4, 4, 4, 4));
mainPanel.add(topPanel, BorderLayout.PAGE_START);
mainPanel.add(scrollpane, BorderLayout.CENTER);
JFrame frame = new JFrame("Layout Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
}
