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How can I add a scroll bar to a text area?

Please, anyone, tell me how to add the scrollbar to a JTextArea. I tried out many things. but still not able to get it. I copied some codes related to the text area.
public class main extends JPanel {
private JTextArea jcomp1;
public main() {
jcomp1 = new JTextArea(5, 5);
setPreferredSize(new Dimension(944, 574));
// setPreferredSize (new Dimension (1024, 1080));
setLayout(null);
//add components
add(jcomp1);
jcomp1.setBounds(110, 165, 330, 300);
}
public static void main(String[] args) {
JFrame frame = new JFrame("Paraphrasing Tool");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new main());
frame.pack();
frame.setVisible(true);
}
}

Oracle has a helpful tutorial, Creating a GUI With Swing. Skip the Netbeans section.
As Andrew said, you have to place the JTextArea inside of a JScrollPane, then place the JScrollPane inside of a JPanel with a Swing layout. I used a BorderLayout.
Here's the GUI after I typed some lines.
Here's the complete runnable code.
import java.awt.BorderLayout;
import java.awt.Insets;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
public class JTextAreaExample extends JPanel {
private static final long serialVersionUID = 1L;
private JTextArea jcomp1;
public JTextAreaExample() {
this.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
this.setLayout(new BorderLayout());
jcomp1 = new JTextArea(5, 30);
jcomp1.setMargin(new Insets(5, 5, 5, 5));
JScrollPane scrollPane = new JScrollPane(jcomp1);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
add(scrollPane);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
JFrame frame = new JFrame("Paraphrasing Tool");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new JTextAreaExample(), BorderLayout.CENTER);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
});
}
}

Add the text area to (the viewport of) a JScrollPane. The easiest way is to add it in the constructor. Then add the scroll pane to a panel with a layout (in a GUI that uses layouts).

How to put JOutlookBar into a JPanel in Java

How can I put a JOutlookBar into a JPanel?
Here is my code:
JFrame frame = new JFrame("JOutlookBar Test");
JOutlookBar outlookBar = new JOutlookBar();
outlookBar.addBar("One", getDummyPanel1("one"));
outlookBar.addBar("Two", getDummyPanel2("Two"));
outlookBar.addBar("Three", getDummyPanel3("Three"));
outlookBar.addBar("Four", getDummyPanel4("Four"));
outlookBar.addBar("Five", getDummyPanel5("Five"));
outlookBar.setVisibleBar(0);
frame.getContentPane().add(outlookBar);
frame.setSize(800, 600);

Adding frame.setVisible(true); allowed me to view your code working correctly.
Below is full working example of the code you provided, copy and paste it into a file named Library.java and it'll be grand!
import java.awt.BorderLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
public class Library {
public static void main(String[] args) {
JFrame frame = new JFrame("JOutlookBar Test");
JPanel left = new JPanel();
JPanel center = new JPanel();
JOutlookBar outlookBar = new JOutlookBar();
outlookBar.addBar("One", getDummyPanel1("one"));
outlookBar.addBar("Two", getDummyPanel1("Two"));
outlookBar.addBar("Three", getDummyPanel1("Three"));
outlookBar.addBar("Four", getDummyPanel1("Four"));
outlookBar.addBar("Five", getDummyPanel1("Five"));
outlookBar.setVisibleBar(0);
//Add outlookbar to left panel
left.add(outlookBar);
//Add some content to center panel...
center.add(new JTextArea());
//Add left and center panels with layout styles
frame.setLayout(new BorderLayout());
frame.add(left, BorderLayout.WEST);
frame.add(center, BorderLayout.CENTER);
frame.setSize(800, 600);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
//Show JFrame
frame.setVisible(true);
}
public static JPanel getDummyPanel1(String num) {
JPanel panel = new JPanel();
panel.add(new JButton("num"));
return panel;
}
}

how to make some specific widths and heights and some auto with jframes - Java

I wanna make a jframe that looks something like this:
As shown on image, I wanna have right side panel to have width of 200px and bottom panel height of 80px, then everything else to be auto, as I want the window to be resizable.
Could someone please help me to achieve this? I've been trying with gridLayout, BorderLayout and others. I've seen something with insets, but can't figure it out.

I believe this should do the trick.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainFrame extends JFrame {
public static void main(String[] args) {
MainFrame frame = new MainFrame();
JPanel centerWrapper = new JPanel();
JPanel center = new JPanel();
center.setBackground(Color.BLUE);
JPanel right = new JPanel();
right.setBackground(Color.CYAN);
right.setPreferredSize(new Dimension(200, 10));
centerWrapper.setLayout(new BorderLayout());
centerWrapper.add(center, BorderLayout.CENTER);
centerWrapper.add(right, BorderLayout.EAST);
JPanel bottom = new JPanel();
bottom.setPreferredSize(new Dimension(640, 200));
bottom.setBackground(Color.GREEN);
frame.setLayout(new BorderLayout());
frame.add(centerWrapper, BorderLayout.CENTER);
frame.add(bottom, BorderLayout.SOUTH);
// you can now use center, right and bottom
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(640, 480);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}

Scroll Bars For Multiple JTextPanes (Java)

Attached is my window code:
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ScrollPaneConstants;
import java.awt.BorderLayout;
import javax.swing.JTextPane;
public class Window extends JFrame{
private JPanel panel;
private JTextPane textPane;
private JTextPane textPane_1;
public Window() {
super("Window");
this.init();
this.setSize(800, 600);
this.setVisible(true);
}
void init(){
panel = new JPanel();
getContentPane().add(panel, BorderLayout.CENTER);
panel.setLayout(null);
textPane = new JTextPane();
textPane.setBounds(6, 48, 788, 185);
panel.add(textPane);
textPane.setFocusable(true);
textPane_1 = new JTextPane();
textPane_1.setBounds(6, 346, 788, 185);
panel.add(textPane_1);
JScrollPane scroll1 = new JScrollPane(textPane, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scroll1.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
scroll1.setViewportView(textPane);
panel.add(scroll1);
this.add(scroll1);
JScrollPane scroll2 = new JScrollPane(textPane_1, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scroll2.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
scroll2.setViewportView(textPane);
panel.add(scroll2);
this.add(scroll2);
this.add(panel);
}
}
My objective is for both JTextPanes to have their own scroll bars. All that appears on the screen though is a single JTextPane (not sure which one), and it has only a vertical scroll bar (I think this is because JTextPanes have word wrap). The second JTextPane isn't showing up. Can anyone help me?
Thanks in advance to all who reply.

You can use GridLayout in this case. See Swing Tutorial on How to Use GridLayout
Here is the code with GridLayout along with inline comments.
import java.awt.BorderLayout;
import java.awt.GridLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.SwingUtilities;
public class MyWindow extends JFrame {
private JPanel panel;
private JTextPane textPane;
private JTextPane textPane_1;
public MyWindow() {
super("Window");
this.init();
}
void init() {
// panel with GridLayout having 2 rows and 1 column
panel = new JPanel(new GridLayout(2,1));
textPane = new JTextPane();
// enclose the text pane inside the scroll pane
// scroll pane shows scrollbars when needed
JScrollPane scroll1 = new JScrollPane(textPane);
// add scroll pane at first column of the first row
// never add text pane again in the panel because
// it's already added in scroll pane
panel.add(scroll1);
textPane_1 = new JTextPane();
JScrollPane scroll2 = new JScrollPane(textPane_1);
// add scroll pane at first column of the second row
panel.add(scroll2);
// finally add the panel in the JFrame's content pane in the center
getContentPane().add(panel, BorderLayout.CENTER);
}
public static void main(String[] args){
SwingUtilities.invokeLater(new Runnable(){
#Override
public void run() {
MyWindow window=new MyWindow();
window.setVisible(true);
}
});
}
}
snapshot:
Please have a look at Swing Tutorial on How to Use Various Layout Managers

Two points to start with, first, JFrame uses a BorderLayout by default, a BorderLayout only allows a single component to occupy any one of its five available positions. Second a component can only belong to a single parent
Taking a look at your code...
scroll1.setViewportView(textPane);
panel.add(scroll1);
this.add(scroll1);
//...
scroll2.setViewportView(textPane);
panel.add(scroll2);
this.add(scroll2);
this.add(panel);
You set textPane as the viewport view for scroll1
You add scroll1 to panel
You add scroll to this, effectively removing it from panel...
You set textPane as the viewport view of scroll2, removing it from the viewport for scroll1
You add scroll2 to the panel
You add scroll2 to this, effectively removing it from panel...
You add panel to this, overriding everything that was added to the frame previously...
This effectively means that panel is the only visible component the BorderLayout will try to layout on the frame, but it contains nothing
Instead, you could specify a position for each scroll pane when adding it to the frame, for example..
scroll1.setViewportView(textPane);
this.add(scroll1, BorderLayout.NORTH);
//...
scroll2.setViewportView(textPane_1);
this.add(scroll2, BorderLayout.SOUTH);
Updated with working example
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Window extends JFrame {
private JTextPane textPane;
private JTextPane textPane_1;
public Window() {
super("Window");
this.init();
this.setSize(800, 600);
this.setVisible(true);
}
void init() {
textPane = new JTextPane();
textPane_1 = new JTextPane();
JScrollPane scroll1 = new JScrollPane(textPane);
scroll1.setViewportView(textPane);
JScrollPane scroll2 = new JScrollPane(textPane_1);
add(scroll1, BorderLayout.NORTH);
add(scroll2, BorderLayout.SOUTH);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
Window frame = new Window();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
This is the default behaviour for a JTextPane, it's overall size is determine by the size of it's content...
Now, you can make suggestions to the scrollpane about how much space your component would like to use by using the Scrollable interface and specifying the "initial", PreferredScrollableViewportSize...
Lucky for you, JTextPane already implements this interface, so you only need to override the getPreferredScrollableViewportSize method, for example...
textPane = new JTextPane() {
#Override
public Dimension getPreferredScrollableViewportSize() {
return new Dimension(200, 200);
}
};
textPane_1 = new JTextPane() {
#Override
public Dimension getPreferredScrollableViewportSize() {
return new Dimension(200, 200);
}
};
Take a look at Laying Out Components Within a Container for more details
Avoid using null layouts, pixel perfect layouts are an illusion within modern ui design. There are too many factors which affect the individual size of components, none of which you can control. Swing was designed to work with layout managers at the core, discarding these will lead to no end of issues and problems that you will spend more and more time trying to rectify

swing and GUI components not appearing

I'm a complete noobie with swing. I'm trying to set a few JPanels and TextAreas to show up but after spending 2 days reading the APIs and trying to add panels to frames and textareas to panels and nothing is showing up.. I'm utterly confused. If anyone could explain how is the best way to do this I would be very grateful
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class GUI {
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.setLayout(new FlowLayout()); // J FRAME
JPanel panel = new JPanel(); // first panel on the left
panel.setLayout(new BoxLayout(panel, 1));
// frame.getContentPane().setBackground(Color.red);
frame.add(panel);
JLabel surname = new JLabel();
JLabel initial = new JLabel();
JLabel ext = new JLabel();
surname.setOpaque(true);
initial.setOpaque(true);
ext.setOpaque(true);
frame.add(surname);
panel.add(initial);
panel.add(ext);
JTextArea table = new JTextArea();
table.setEditable(false);
panel.add(table);
table.setVisible(true);

You're adding stuff to the JFrame after it's already visible. If you do that, you need to revalidate your JFrame so it knows to redo its layout.
You could also just wait to show your JFrame until after you've added everything.
Edit: Here is an example program that shows what I'm talking about. Try running this, then take out the call to revalidate() to see the difference.
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class Test {
public static void main(String[] args) {
final JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final JButton show = new JButton("Show");
show.addActionListener(new ActionListener(){
#Override
public void actionPerformed(ActionEvent showE) {
frame.add(new JLabel("Test"), BorderLayout.SOUTH);
frame.revalidate(); //tell the JFrame to redo its layout!
}
});
frame.add(show);
frame.setSize(200, 200);
frame.setVisible(true);
}
}

You are adding an empty elements like:
JLabel surname = new JLabel();
Your elements is already added but have nothing to be display.
Try :
JLabel surname = new JLabel("UserName");
JLabel initial = new JLabel("Iinitial");
JLabel ext = new JLabel("Ext");
JTextArea table = new JTextArea(10, 5);