Develop Reference

Displaying iteration in each JTextArea

I got 5 JTextareas that stand for output for the sorting I need help regarding displaying or appending iteration in each JTextArea to show the algorithm of sorting.
I have got values of { 5,3,9,7,1,8 }
JTextArea1 |3, 5, 7, 1, 8, 9|
JTextArea2 |3, 5, 1, 7, 8, 9|
JTextArea3 |3, 5, 1, 7, 8, 9|
JTextArea4 |1, 3, 5, 7, 8, 9|
JTextArea5 |1, 3, 5, 7, 8, 9|
My problem is how can I append those values in each textarea.
My code is too long, I'm sorry for that.
My code is not finished yet. I just ended on the button of ascbubble but it can run.
//importing needed packages
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Sorting extends JPanel
{
// String needed to contain the values then convert into int
int int1,int2,int3,int4,int5,temp;
String str1,str2,str3,str4,str5;
//Buttons needed
JButton ascbubble,descbubble,
ascballoon,descballoon,
clear;
//Output Area of the result sorting
JTextArea output1,output2,
output3,output4,
output5;
//Text Field for user to input numbers
JTextField input1,input2,
input3,input4,
input5;
Sorting()
{
//set color of the background
setBackground(Color.black);
//initialize JButton,JTextArea and JTextField
//JButton
ascbubble = new JButton("Ascending Bubble");
descbubble = new JButton("Descending Bubble");
ascballoon = new JButton("Ascending Balloon");
descballoon = new JButton("Descending Balloon");
clear = new JButton("Clear");
//JTextArea
output1 = new JTextArea(" ");
output2 = new JTextArea(" ");
output3 = new JTextArea(" ");
output4 = new JTextArea(" ");
output5 = new JTextArea(" ");
//JTextField
input1 = new JTextField("00");
input2 = new JTextField("00");
input3 = new JTextField("00");
input4 = new JTextField("00");
input5 = new JTextField("00");
//SetBounds
setLayout(null);
input1.setBounds(120, 50, 30, 20);
input2.setBounds(170, 50, 30, 20);
input3.setBounds(220, 50, 30, 20);
input4.setBounds(270, 50, 30, 20);
input5.setBounds(320, 50, 30, 20);
ascbubble.setBounds(50, 120, 150, 40);
descbubble.setBounds(50, 180, 150, 40);
clear.setBounds(210, 140, 100, 50);
ascballoon.setBounds(320, 120, 150, 40);
descballoon.setBounds(320, 180, 150, 40);
output1.setBounds(20, 300, 80, 100);
output2.setBounds(120, 300, 80, 100);
output3.setBounds(220, 300, 80, 100);
output4.setBounds(320, 300, 80, 100);
output5.setBounds(420, 300, 80, 100);
//add function to the buttons
thehandler handler = new thehandler();
ascbubble.addActionListener(handler);
descbubble.addActionListener(handler);
ascballoon.addActionListener(handler);
descballoon.addActionListener(handler);
//add to the frame
add(input1);
add(input2);
add(input3);
add(input4);
add(input5);
add(output1);
add(output2);
add(output3);
add(output4);
add(output5);
add(ascbubble);
add(descbubble);
add(ascballoon);
add(descballoon);
add(clear);
}
private class thehandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==ascbubble)
{
//input1
str1=input1.getText();
int1=Integer.parseInt(str1);
//input2
str2=input2.getText();
int2=Integer.parseInt(str2);
//input3
str3=input3.getText();
int3=Integer.parseInt(str3);
//input4
str4=input4.getText();
int4=Integer.parseInt(str4);
//input5
str5=input5.getText();
int5=Integer.parseInt(str5);
int contain[]={int1,int2,int3,int4,int5};
//formula for Buble Sort Ascending Order
for ( int pass = 1; pass < contain.length; pass++ )
{
for ( int i = 0; i < contain.length - pass; i++ )
{
if ( contain[ i ] > contain[ i + 1 ] )
{
temp = contain[ i ];
contain[ i ] = contain[ i + 1 ];
contain[ i + 1 ] = temp;
}
}
}
}
}
}
public static void main(String[]args)
{
JFrame frame = new JFrame("Sorting");
frame.add(new Sorting());
frame.setSize(550, 500);
frame.setVisible(true);
}
}

First of all, JTextArea has a simple append method, so you only need one. On each pass, you simply need to generate a new String which represents the current state of the array
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.StringJoiner;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Sort {
public static void main(String[] args) {
new Sort();
}
public Sort() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JTextField fieldValues;
private JTextArea fieldResults;
public TestPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.insets = new Insets(2, 2, 2, 2);
fieldValues = new JTextField(20);
fieldResults = new JTextArea(10, 20);
add(fieldValues, gbc);
JButton btn = new JButton("Sort");
add(btn, gbc);
add(new JScrollPane(fieldResults), gbc);
btn.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
String[] values = fieldValues.getText().split(",");
int[] contain = new int[values.length];
for (int index = 0; index < values.length; index++) {
contain[index] = Integer.parseInt(values[index].trim());
}
for (int pass = 1; pass < contain.length; pass++) {
for (int i = 0; i < contain.length - pass; i++) {
if (contain[i] > contain[i + 1]) {
int temp = contain[i];
contain[i] = contain[i + 1];
contain[i + 1] = temp;
StringJoiner sj = new StringJoiner(", ", "", "\n");
for (int value : contain) {
sj.add(Integer.toString(value));
}
fieldResults.append(sj.toString());
}
}
}
}
});
}
}
}
Now, the problem with this is, the larger the dataset, the more time it will take to sort, this will mean the UI will pause until the sort is completed
One solution would be to use a SwingWorker, for example...
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.List;
import java.util.StringJoiner;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingWorker;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Sort {
public static void main(String[] args) {
new Sort();
}
public Sort() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JTextField fieldValues;
private JTextArea fieldResults;
public TestPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.insets = new Insets(2, 2, 2, 2);
fieldValues = new JTextField(20);
fieldResults = new JTextArea(10, 20);
add(fieldValues, gbc);
JButton btn = new JButton("Sort");
add(btn, gbc);
add(new JScrollPane(fieldResults), gbc);
btn.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
btn.setEnabled(false);
String text = fieldValues.getText();
SortWorker worker = new SortWorker(text);
worker.addPropertyChangeListener(new PropertyChangeListener() {
#Override
public void propertyChange(PropertyChangeEvent evt) {
String name = evt.getPropertyName();
if ("state".equals(name)) {
if (worker.getState() == SwingWorker.StateValue.DONE) {
btn.setEnabled(true);
}
}
}
});
worker.execute();
}
});
}
public class SortWorker extends SwingWorker<int[], String> {
private String text;
public SortWorker(String text) {
this.text = text;
}
#Override
protected void process(List<String> chunks) {
for (String value : chunks) {
fieldResults.append(value);
}
}
#Override
protected int[] doInBackground() throws Exception {
String[] values = text.split(",");
int[] contain = new int[values.length];
for (int index = 0; index < values.length; index++) {
contain[index] = Integer.parseInt(values[index].trim());
}
for (int pass = 1; pass < contain.length; pass++) {
for (int i = 0; i < contain.length - pass; i++) {
if (contain[i] > contain[i + 1]) {
int temp = contain[i];
contain[i] = contain[i + 1];
contain[i + 1] = temp;
StringJoiner sj = new StringJoiner(", ", "", "\n");
for (int value : contain) {
sj.add(Integer.toString(value));
}
publish(sj.toString());
}
}
}
return contain;
}
}
}
}

component must be showing on the screen to determine its location when changing JCOMBOX

I am receiving this error when i change items in the Jcombobox, nothing breaks it just shows this error, is there anyway to just throw it so it doesn't show up. everything still works fine, but if you wish to have a look at the code. i will post below.
Error message:
java.awt.IllegalComponentStateException: component must be showing on the screen to determine its location
at java.awt.Component.getLocationOnScreen_NoTreeLock(Component.java:2056)
at java.awt.Component.getLocationOnScreen(Component.java:2030)
at sun.lwawt.macosx.CAccessibility$23.call(CAccessibility.java:395)
at sun.lwawt.macosx.CAccessibility$23.call(CAccessibility.java:393)
at sun.lwawt.macosx.LWCToolkit$CallableWrapper.run(LWCToolkit.java:538)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:301)
And my code which i don't know which section to show so its all their.
import javax.swing.*;
import java.awt.Dialog.ModalityType;
import java.awt.event.*;
import java.awt.*;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
public class TouchOn extends JDialog {
private JPanel mainPanel;
public ArrayList Reader(String Txtfile) {
try {
ArrayList<String> Trains = new ArrayList<String>();
int count = 0;
String testing = "";
File file = new File(Txtfile);
FileReader fileReader = new FileReader(file);
BufferedReader bufferedReader = new BufferedReader(fileReader);
StringBuffer stringBuffer = new StringBuffer();
String line;
while ((line = bufferedReader.readLine()) != null)
{
stringBuffer.append(line);
count += count;
if(!line.contains("*")){
Trains.add(line + "\n");
}
stringBuffer.append("\n");
}
fileReader.close();
//Arrays.asList(Trains).stream().forEach(s -> System.out.println(s));
return Trains;
} catch (IOException e) {
e.printStackTrace();
}
//return toString();
return null;
}
public TouchOn()
{
setPanels();
setModalityType(ModalityType.APPLICATION_MODAL);
setSize(400, 300);
setVisible(true);
}
public void setPanels()
{
mainPanel = new JPanel(new GridLayout(0, 2));
JPanel containerPanel = new JPanel(new GridLayout(0, 1));
JLabel startDay = new JLabel("Day:");
JTextField sDay = new JTextField();
JLabel startMonth = new JLabel("Month:");
JTextField sMonth = new JTextField();
JLabel startYear = new JLabel("Year:");
JTextField sYear = new JTextField("2015");
String trainline = "";
JLabel touchOnTimehr = new JLabel("Time Hour: ");
JLabel touchOnTimem = new JLabel("Time Minute:");
JLabel station = new JLabel("Station: ");
JTextField touchOnTimeFieldhour = new JTextField();
JTextField touchOnTimeFieldminute = new JTextField();
JPanel lowerPanel = new JPanel(new FlowLayout());
ArrayList<String> stations = Reader("TrainLines.txt");
JComboBox<String> cb = new JComboBox<>(stations.toArray(new String[stations.size()]));
JRadioButton belgrave = new JRadioButton("Belgrave Line");
belgrave.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
}
});
JRadioButton glenwaverly = new JRadioButton("Glen Waverly Line");
glenwaverly.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
}
});
ButtonGroup bG = new ButtonGroup();
JButton apply = new JButton("Touch on");
JButton cancel = new JButton("Cancel");
cancel.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
dispose();
}
});
apply.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String timestamp = new java.text.SimpleDateFormat("dd/MM/yyyy").format(new Date());
String day = sDay.getText();
String month = sMonth.getText();
String year = sYear.getText();
String hour = touchOnTimeFieldhour.getText();
String minute = touchOnTimeFieldminute.getText();
if(belgrave.isSelected()){
String trainline = belgrave.getText();
}
if(glenwaverly.isSelected()){
String trainline = glenwaverly.getText();
}
System.out.println(trainline);
}
});
cb.setVisible(true);
bG.add(belgrave);
bG.add(glenwaverly);
mainPanel.add(startDay);
mainPanel.add(sDay);
mainPanel.add(startMonth);
mainPanel.add(sMonth);
mainPanel.add(startYear);
mainPanel.add(sYear);
mainPanel.add(touchOnTimehr);
mainPanel.add(touchOnTimeFieldhour);
mainPanel.add(touchOnTimem);
mainPanel.add(touchOnTimeFieldminute);
mainPanel.add(belgrave);
mainPanel.add(glenwaverly);
mainPanel.add(station);
mainPanel.add(new JLabel());
mainPanel.add(cb);
lowerPanel.add(apply);
lowerPanel.add(cancel);
touchOnTimeFieldhour.setSize(10,10);
containerPanel.add(mainPanel);
containerPanel.add(lowerPanel);
add(containerPanel);
}
}

Don't create multiple JComboBoxes and then swap visibility. Instead use one JComboBox and create multiple combo box models, such as by using DefaultComboBoxModel<String>, and then swap out the model that it holds by using its setModel(...) method. Problem solved.
Note that using a variation on your code -- I'm not able to reproduce your problem:
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Date;
import javax.swing.AbstractAction;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class TestFoo2 {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndDisplayGui();
}
});
}
public static void createAndDisplayGui() {
final JFrame frame = new JFrame("Foo");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
JButton button = new JButton(new AbstractAction("Press Me") {
#Override
public void actionPerformed(ActionEvent evt) {
TouchOn2 touchOn2 = new TouchOn2(frame);
touchOn2.setVisible(true);
}
});
JPanel panel = new JPanel();
panel.add(button);
frame.add(panel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
#SuppressWarnings("serial")
class TouchOn2 extends JDialog {
private JPanel mainPanel;
#SuppressWarnings({ "rawtypes", "unused" })
public ArrayList Reader(String Txtfile) {
ArrayList<String> list = new ArrayList<>();
for (int i = 0; i < 100; i++) {
list.add("Data String Number " + (i + 1));
}
// return toString();
// !! return null;
return list;
}
public TouchOn2(Window owner) {
super(owner);
setPanels();
setModalityType(ModalityType.APPLICATION_MODAL);
setSize(400, 300);
setVisible(true);
}
#SuppressWarnings("unchecked")
public void setPanels() {
mainPanel = new JPanel(new GridLayout(0, 2));
JPanel containerPanel = new JPanel(new GridLayout(0, 1));
JLabel startDay = new JLabel("Day:");
final JTextField sDay = new JTextField();
JLabel startMonth = new JLabel("Month:");
final JTextField sMonth = new JTextField();
JLabel startYear = new JLabel("Year:");
final JTextField sYear = new JTextField("2015");
final String trainline = "";
JLabel touchOnTimehr = new JLabel("Time Hour: ");
JLabel touchOnTimem = new JLabel("Time Minute:");
JLabel station = new JLabel("Station: ");
final JTextField touchOnTimeFieldhour = new JTextField();
final JTextField touchOnTimeFieldminute = new JTextField();
JPanel lowerPanel = new JPanel(new FlowLayout());
ArrayList<String> stations = Reader("TrainLines.txt");
final JComboBox<String> cb = new JComboBox<>(
stations.toArray(new String[stations.size()]));
final JRadioButton belgrave = new JRadioButton("Belgrave Line");
belgrave.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}
});
final JRadioButton glenwaverly = new JRadioButton("Glen Waverly Line");
glenwaverly.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}
});
ButtonGroup bG = new ButtonGroup();
JButton apply = new JButton("Touch on");
JButton cancel = new JButton("Cancel");
cancel.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
dispose();
}
});
apply.addActionListener(new ActionListener() {
#SuppressWarnings("unused")
public void actionPerformed(ActionEvent e) {
String timestamp = new java.text.SimpleDateFormat("dd/MM/yyyy")
.format(new Date());
String day = sDay.getText();
String month = sMonth.getText();
String year = sYear.getText();
String hour = touchOnTimeFieldhour.getText();
String minute = touchOnTimeFieldminute.getText();
if (belgrave.isSelected()) {
// !! ***** note you're shadowing variables here!!!! ****
String trainline = belgrave.getText();
}
if (glenwaverly.isSelected()) {
// !! and here too
String trainline = glenwaverly.getText();
}
System.out.println(trainline);
}
});
cb.setVisible(true);
bG.add(belgrave);
bG.add(glenwaverly);
mainPanel.add(startDay);
mainPanel.add(sDay);
mainPanel.add(startMonth);
mainPanel.add(sMonth);
mainPanel.add(startYear);
mainPanel.add(sYear);
mainPanel.add(touchOnTimehr);
mainPanel.add(touchOnTimeFieldhour);
mainPanel.add(touchOnTimem);
mainPanel.add(touchOnTimeFieldminute);
mainPanel.add(belgrave);
mainPanel.add(glenwaverly);
mainPanel.add(station);
mainPanel.add(new JLabel());
mainPanel.add(cb);
lowerPanel.add(apply);
lowerPanel.add(cancel);
touchOnTimeFieldhour.setSize(10, 10);
containerPanel.add(mainPanel);
containerPanel.add(lowerPanel);
add(containerPanel);
}
}

Why are my labels spaced out so far in the GridBagLayout?

Im new to GUI's in Java and having a hell of a time understanding this:
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.ScrollPaneConstants;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;
import javax.swing.JScrollPane;
import java.awt.GridBagLayout;
public class Main extends JFrame {
private JPanel contentPane;
static JPanel panel;
static JScrollPane scrollPane;
static JButton btnStart;
private static String compTestArray[];
static Integer indexer = 0;
static List<JLabel> listOfLabels = new ArrayList<JLabel>();
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Main frame = new Main();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public Main() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 739, 456);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
btnStart = new JButton("Start");
btnStart.setBounds(10, 379, 89, 23);
btnStart.addActionListener(new ButtonListener());
contentPane.add(btnStart);
panel = new JPanel();
panel.setBounds(10, 11, 513, 359);
contentPane.add(panel);
scrollPane = new JScrollPane(panel,
ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
GridBagLayout gbl_panel = new GridBagLayout();
gbl_panel.columnWidths = new int[] { 0, 0, 0 };
gbl_panel.rowHeights = new int[] { 0, 0, 0, 0 };
gbl_panel.columnWeights = new double[] { 0.0, 0.0, Double.MIN_VALUE };
gbl_panel.rowWeights = new double[] { 0.0, 0.0, 0.0, Double.MIN_VALUE };
panel.setLayout(gbl_panel);
scrollPane.setBounds(10, 11, 633, 359);
contentPane.add(scrollPane);
compTestArray = new String[2];
compTestArray[0] = "172.16.98.3";
compTestArray[1] = "172.16.98.6";
}
static class ButtonListener implements ActionListener {
#Override
public void actionPerformed(ActionEvent arg0) {
//String labelText = "Computer Name\tTest Name\tIteration\tPass\tFail\tCrashes\tStart\tStop";
//labelText = labelText.replaceAll("\t", " ");
listOfLabels.add(new JLabel("Computer"));
for(int ix = 0; ix < compTestArray.length; ix++){
// Clear panel
panel.removeAll();
//labelText = compTestArray[indexer] + "\tKPI_1_1_1_1\t" + ix + "/20\t1\t\t0\t\t0\t\t12:00\t12:30";
//labelText = labelText.replaceAll("\t", " ");
listOfLabels.add(new JLabel(compTestArray[indexer]));
System.out.println("indexer is " + indexer);
// Create constraints
GridBagConstraints labelConstraints = new GridBagConstraints();
// Add labels and text fields
for (int i = 0; i < indexer+2; i++) {
// Label constraints
labelConstraints.gridx = 0;
labelConstraints.gridy = i;
labelConstraints.weightx = 0;
labelConstraints.insets = new Insets(10, 10, 10, 10);
// Add them to panel
panel.add(listOfLabels.get(i), labelConstraints);
}
// Align components top-to-bottom
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = indexer;
c.weighty = 1;
panel.add(new JLabel(), c);
// Increment indexer
indexer++;
// Repaint the GUI
scrollPane.validate();
} // Close for loop
// Disable Start button
btnStart.setEnabled(false);
} // Close public void actionPerformed(ActionEvent arg0)
} // Close static class ButtonListener implements ActionListener
}
Output:

Using Radio Buttons to set labels in Java

So for class I'm suppose to make a Celsius to Fahrenheit converter GUI. With that said, it's a pretty simple and easy program to create. I want to do more with it though. What I want to do is have one window that changes depending on which radio button is selected in a buttongroup. I want the selected radiobutton for "To Fahrenheit" or "To Celsius" to update the labels for the input and output. I have tried using an actionlistener for when one is selected, but it doesn't change the labels. Am I using the wrong listener? What's the correct way to do this?
Here's my code:
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.border.EmptyBorder;
public class Converter extends JFrame {
private JPanel contentPane;
private JTextField tfNumber;
private JLabel lblCelsius;
private JLabel lblFahrenheit;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Converter frame = new Converter();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public Converter() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
e.printStackTrace();
}
setTitle("Celsius Converter");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 308, 145);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
tfNumber = new JTextField();
tfNumber.setText("0");
tfNumber.setBounds(10, 11, 123, 20);
contentPane.add(tfNumber);
tfNumber.setColumns(10);
lblCelsius = new JLabel("Celsius");
lblCelsius.setFont(new Font("Tahoma", Font.BOLD, 15));
lblCelsius.setBounds(143, 12, 127, 14);
contentPane.add(lblCelsius);
lblFahrenheit = new JLabel("Fahrenheit");
lblFahrenheit.setBounds(187, 46, 95, 14);
contentPane.add(lblFahrenheit);
final JLabel lblNum = new JLabel("32.0");
lblNum.setBounds(143, 46, 43, 14);
contentPane.add(lblNum);
final JRadioButton rdbtnF = new JRadioButton("to Fahrenheit");
rdbtnF.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(rdbtnF.isSelected()) {
lblCelsius.setText("Celsius");
lblFahrenheit.setText("Fahrenheit");
}
}
});
rdbtnF.setSelected(true);
rdbtnF.setBounds(10, 72, 109, 23);
contentPane.add(rdbtnF);
final JRadioButton rdbtnC = new JRadioButton("to Celsius");
rdbtnC.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(rdbtnF.isSelected()) {
lblCelsius.setText("Fahrenheit");
lblFahrenheit.setText("Celsius");
}
}
});
rdbtnC.setBounds(121, 72, 109, 23);
contentPane.add(rdbtnC);
ButtonGroup bg = new ButtonGroup();
bg.add(rdbtnF);
bg.add(rdbtnC);
JButton btnConvert = new JButton("Convert");
btnConvert.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(rdbtnF.isSelected()) {
String num = String.valueOf(convertToF(tfNumber.getText()));
lblNum.setText(num);
}
if(rdbtnC.isSelected()) {
String num = String.valueOf(convertToC(tfNumber.getText()));
lblNum.setText(num);
}
}
});
btnConvert.setBounds(10, 42, 123, 23);
contentPane.add(btnConvert);
}
private double convertToF(String celsius) {
double c = Double.parseDouble(celsius);
double fahren = c * (9/5) + 32;
return fahren;
}
private double convertToC(String fahren) {
double f = Double.parseDouble(fahren);
double celsius = (f - 32) * 5 / 9;
return celsius;
}
}

Java. GUI WindowBuilder scroll bar in text area doesn't work

I don't know why my scroll bar in text area doesn't work. I found many solutions in internet, but no 1 helped for me.
textArea1 = new JTextArea();
textArea1.setBounds(13, 28, 182, 199);
panel.add(textArea1);
JScrollBar scrollBar = new JScrollBar();
scrollBar.setBounds(205, 1, 17, 242);
panel.add(scrollBar);
I found that can't be Panel's layout Absolute, if I change It to Group layout the same.
What's wrong? Could you help me? Thank you.
UPDATED:
package lt.kvk.i3_2.kalasnikovas_stanislovas;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.BorderLayout;
import javax.swing.JTextPane;
import javax.swing.DropMode;
import javax.swing.JFormattedTextField;
import java.awt.Component;
import javax.swing.Box;
import java.awt.Dimension;
import javax.swing.JTextField;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Toolkit;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import javax.swing.JMenuItem;
import javax.swing.LayoutStyle.ComponentPlacement;
import javax.swing.ImageIcon;
import javax.swing.JDesktopPane;
import java.awt.SystemColor;
import java.awt.Font;
import javax.swing.border.BevelBorder;
import javax.swing.border.EtchedBorder;
import javax.swing.JScrollBar;
import java.awt.Color;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;
import javax.swing.JLabel;
import javax.swing.JToolBar;
public class KDVizualizuotas {
private JFrame frmInformacijaApieMuzikos;
private JTextField txtStilius;
private JTextArea textArea1;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
KDVizualizuotas window = new KDVizualizuotas();
window.frmInformacijaApieMuzikos.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public KDVizualizuotas() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frmInformacijaApieMuzikos = new JFrame();
frmInformacijaApieMuzikos.setResizable(false);
frmInformacijaApieMuzikos.setIconImage(Toolkit.getDefaultToolkit().getImage(KDVizualizuotas.class.getResource("/lt/kvk/i3_2/kalasnikovas_stanislovas/resources/Sidebar-Music-Blue-icon.png")));
frmInformacijaApieMuzikos.setTitle("Muzikos stiliai");
frmInformacijaApieMuzikos.setBounds(100, 100, 262, 368);
frmInformacijaApieMuzikos.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
txtStilius = new JTextField();
txtStilius.setBounds(10, 34, 128, 20);
txtStilius.setColumns(10);
JButton btnIekoti = new JButton("Ie\u0161koti");
btnIekoti.setBounds(146, 36, 89, 19);
btnIekoti.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
// textArea1.append(txtStilius.getText()+"\n");
// txtStilius.getText();
Scanner input = new Scanner(System.in);
try {
FileReader fr = new FileReader("src/lt/kvk/i3_2/kalasnikovas_stanislovas/Stiliai.txt");
BufferedReader br = new BufferedReader(fr);
String stiliuSarasas;
while((stiliuSarasas = br.readLine()) != null) {
System.out.println(stiliuSarasas);
textArea1.append(stiliuSarasas+"\n");
}
fr.close();
}
catch (IOException e) {
System.out.println("Error:" + e.toString());
}
}
});
JPanel panel = new JPanel();
panel.setBounds(10, 65, 224, 243);
panel.setBorder(new EtchedBorder(EtchedBorder.LOWERED, null, null));
panel.setBackground(SystemColor.text);
JLabel lblveskiteMuzikosStili = new JLabel("\u012Eveskite muzikos stili\u0173:");
lblveskiteMuzikosStili.setBounds(10, 14, 222, 14);
frmInformacijaApieMuzikos.getContentPane().setLayout(null);
panel.setLayout(null);
frmInformacijaApieMuzikos.getContentPane().add(panel);
JLabel lblInformacijaApieMuzikos = new JLabel("Informacija apie muzikos stili\u0173:");
lblInformacijaApieMuzikos.setBounds(12, 3, 190, 14);
panel.add(lblInformacijaApieMuzikos);
textArea1 = new JTextArea();
textArea1.setBounds(13, 28, 182, 199);
panel.add(textArea1);
JScrollBar scrollBar = new JScrollBar();
scrollBar.setBounds(205, 1, 17, 242);
panel.add(scrollBar);
frmInformacijaApieMuzikos.getContentPane().add(txtStilius);
frmInformacijaApieMuzikos.getContentPane().add(btnIekoti);
frmInformacijaApieMuzikos.getContentPane().add(lblveskiteMuzikosStili);
JMenuBar menuBar = new JMenuBar();
frmInformacijaApieMuzikos.setJMenuBar(menuBar);
JMenu mnFile = new JMenu("File");
menuBar.add(mnFile);
JMenuItem mntmExit = new JMenuItem("Exit");
mntmExit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
System.exit(0);
}
});
mntmExit.setIcon(new ImageIcon(KDVizualizuotas.class.getResource("/lt/kvk/i3_2/kalasnikovas_stanislovas/resources/exitas.png")));
mnFile.add(mntmExit);
JMenu mnEdit = new JMenu("Edit");
menuBar.add(mnEdit);
JMenu mnHelp = new JMenu("Help");
menuBar.add(mnHelp);
JMenuItem mntmHelp = new JMenuItem("Help");
mnHelp.add(mntmHelp);
JMenu mnAbout = new JMenu("About");
menuBar.add(mnAbout);
JMenuItem mntmAbout = new JMenuItem("About");
mntmAbout.setIcon(new ImageIcon(KDVizualizuotas.class.getResource("/lt/kvk/i3_2/kalasnikovas_stanislovas/resources/questionmark.png")));
mnAbout.add(mntmAbout);
}
}

You need to add the component you want to be contained within the scroll pane to it.
You can do this via the JScrollPane's constructor or JScrollPane#setViewportView method
public class ScrollPaneTest {
public static void main(String[] args) {
new ScrollPaneTest();
}
public ScrollPaneTest() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception ex) {
}
JPanel bigPane = new JPanel();
bigPane.setBackground(Color.BLUE);
// This is not recommended, but is used for demonstration purposes
bigPane.setPreferredSize(new Dimension(1024, 768));
JScrollPane scrollPane = new JScrollPane(bigPane);
scrollPane.setPreferredSize(new Dimension(400, 400));
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(scrollPane);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
Updated with proper layout
You should avoid null or absolute layouts, they will only hurt you in the long wrong.
You may also find How to use Scroll Panes of use
public class BadLayout {
public static void main(String[] args) {
new BadLayout();
}
public BadLayout() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception ex) {
}
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JTextField searchField;
private JButton searchButton;
private JTextArea searchResults;
public TestPane() {
setLayout(new BorderLayout());
searchResults = new JTextArea();
searchResults.setLineWrap(true);
searchResults.setWrapStyleWord(true);
JScrollPane scrollPane = new JScrollPane(searchResults);
JPanel results = new JPanel(new BorderLayout());
results.setBorder(new EmptyBorder(4, 8, 8, 8));
results.add(scrollPane);
add(results);
JPanel search = new JPanel(new GridBagLayout());
search.setBorder(new EmptyBorder(8, 8, 4, 8));
searchField = new JTextField(12);
searchButton = new JButton("Search");
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.weightx = 1;
gbc.insets = new Insets(0, 0, 0, 4);
search.add(searchField, gbc);
gbc.insets = new Insets(0, 0, 0, 0);
gbc.gridx++;
gbc.fill = GridBagConstraints.NONE;
gbc.weightx = 0;
search.add(searchButton, gbc);
add(search, BorderLayout.NORTH);
}
#Override
public Dimension getPreferredSize() {
return new Dimension(200, 400);
}
}
}