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Java swing add text on text area [duplicate]

I have a text area with some text in it and I want to add some lines to it again, (the first lines + the other lines that I want to add) but it doesn't work.
The way I'm doing it right now erases the old text and shows just the new lines.

Instead of using JTextArea.setText(String text), use JTextArea.append(String text).
Appends the given text to the end of the document. Does nothing if the model is null or the string is null or empty.
This will add text on to the end of your JTextArea.
Another option would be to use getText() to get the text from the JTextArea, then manipulate the String (add or remove or change the String), then use setText(String text) to set the text of the JTextArea to be the new String.

Are you using JTextArea's append(String) method to add additional text?
JTextArea txtArea = new JTextArea("Hello, World\n", 20, 20);
txtArea.append("Goodbye Cruel World\n");

When you want to create a new line or wrap in your TextArea you have to add \n (newline) after the text.
TextArea t = new TextArea();
t.setText("insert text when you want a new line add \nThen more text....);
setBounds();
setFont();
add(t);
This is the only way I was able to do it, maybe there is a simpler way but I havent discovered that yet.

How to format a table in JOptionpane?

So, I have a program which searches through a file to find desired information that the user wants, and I am trying to output it in a nice table in JOptionPane to make it easier to read, but I keep getting something like this:
I would like the lines to line up accordingly and be formatted properly, here is the code for that particular message:
String message=String.format("%-10s|%7s|%14s|%13s|%22s", element,symbol,atomicNumber,atomicMass,valence);
JOptionPane.showMessageDialog(null, "Name |Symbol |Atomic Number |Atomic Mass |# of Valence Electrons \n _________________________________________________________________ \n " + message);
Can't seem to figure out what i'm doing wrong here, I used the exact same format code in a different assignment in which it only utilized the terminal and it worked fine, but now that I'm trying to use it in JOptionPane it's not formatting properly.
Any ideas on how to fix this or make it work?

Try JTable instead:
Object[][] rows = {
{element,symbol,atomicNumber,atomicMass,valence}
};
Object[] cols = {
"Name","Symbol","Atomic Number","Atomic Mass", "# of Valence Electrons"
};
JTable table = new JTable(rows, cols);
JOptionPane.showMessageDialog(null, new JScrollPane(table));

The difference between the terminal and your Swing dialog is that the former using a fixed width font, while the latter uses a variable width font. For example: if you look at the picture you posted, you can see that the 'i' is far less wide than the 'm'. That means that a String 15 characters long does not necessarily take up the same space as another String of the same length.
The correct solution to format something like this in Swing is to use either a JTable or a GridBagLayout. If you are happy to use a third party library I recommend looking at DesignGridLayout.
You could also set the font explicitly, but that would still require you to change your code and it would look a bit archaic in the context of a Swing application.

Any ideas on how to fix this or make it work?
In the context of a brute force solution for the JOptionPane you should be able to specify an Array of Objects to be used by the option pane. So the code would be something like:
JLabel[] labels = new JLabel[3];
JLabel heading = new JLabel(...);
heading.setFont( ("monospaced", Font.PLAIN, 12) );
labels[0] = heading;
JLabel line = new JLabel(...);
...
JLabel data = new JLabel(...);
...
JOptionPane.showMessageDialog(null, labels);
This is not a very good solution, but I just wanted to demonstrate the flexibility of JOptionPane to display multiple components organized vertically.
Another option might be to play with the UIManager and change the default font for the option pane. The code would be something like:
Font original = UIManager.getFont("Label.font");
UIManager.put("Label.font", new Font(...)); // specify your monospaced font here
JOptionPane.showMessage(...);
UIManager.put("Label.font", original); // restore default font
I'm not sure if this font applies to all the components on the option pane or just the buttons or just the display components.
The JTable would be the better approach for my money.

How can I create a new line in JTextField to type in?

I want to make a Swing program that writes updates on what you have done. It writes all the information on an uneditable JTextField.
For example:
You have changed the text to BLUE.
You have changed the text to RED.
The problem is that I can't make the two lines separate.
What I get is this:
You have changed the text to BLUE. You have changed the text to RED.
What I've tried is this: (This does not work)
TF_BetInfo.setText(TF_BetInfo.getText() + "\nYou have changed the text to BLUE.");
TF_BetInfo.setText(TF_BetInfo.getText() + "\nYou have changed the text to RED.");

you can't have multiple lines with JTextField , you can use JTextArea for that purpose , and the code wouldn't be much different too , you can still use the same code or you can just
TF_BetInfo.append("\nyou have ...... ");
where TF_Betinfo is a JTextArea rather than a JTextField .

You can't use JTextField for this. JTextField is sinle-line edit control. That is why you got all your output in one line.
If you want several lines to be printed in edit use JTextArea. In your case you can use jTextArea.append(string) (note: jTextArea is an object of class JTextArea, and string is an object of class String).

You can't actually use several lines in a JTextField, but what you can do, is using a JTextArea of the wanted size, and then use the following:
yourJTextArea.setLineWrap(true);
This will automatically detect when the JTextArea needs to use another line and add it, pretty cool, useful and you only need one code line to do it.
JTextArea is more flexible but if you really want flexibility read about JTextPane or JEditorPane, you can show URLS, internet pages and everything that comes to your mind.

Multiline Text output in javafx

I need to output 5-8 lines to my window. I managed that with a TextArea, BUT, i don't want the user to be able to write inside it, AND I also can't use my keyboard to navigate between buttons and other elements on the page.
Lets say that there is a String named text, which field type do you think i should write it out into? Text is good but only lets me use a single line.
Text actiontarget3;
String text = new String(" something \n Second line something");
actiontarget4.setText(text);
Because I use FXML to design the menu page, the relevant part is:
<Text fx:id="actiontarget3"
GridPane.columnIndex="1" GridPane.rowIndex="1"/>
Basically, I managed to get the info from a ping test, added it to an ArrayList<String>
and I want to display the results on the Graphic User Interface. But the above example covers my problems without having to copy paste here the entire code.

You can make it so a TextArea is not editable.
JTextArea ta = new JTextArea();
ta.setEditable(false);
You may also want to look into using a JTextPane.

Swing Component with automatic line wraping and limited width with HTML support

I want to implement a small tooltip with a scrollbar like the one in eclipse that appears when hovering above a class or member.
The problem I have is finding a way to limit only the width but not the height of a component within the scroll pane I have inside my tooltip. The component should support HTML and also wrap the text correctly when it exceeds the width of the inner bounds, but all components I have tried out have either line wrapping or HTML rendering, but not both
A way to limit only width is also nowhere to be found as every "setXSize" where X is "preferred" "max" "min" etc. all require two arguments and there is no "setMaxWidth" method for components.
Setting "setMaximumSize(new Dimension(256, Integer.MAX_VALUE);" would seem like a solution but it doesnt work as parameters set by "max" and "min" are ignored most of the time which is quite frustrating.
On request a current example of the implementation:
public class MyTooltip extends JTooltip{
private JScrollPane scroll;
private JEditorPane pane;
public MyTooltip(String htmlCode){
this.pane = new JEditorPane();
this.scroll = new JScrollPane(this.pane);
this.pane.setEditable(false);
this.pane.setContentType("text/html");
this.scroll.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
//Here the problems begin
this.pane.setMaximumSize(new Dimension(512, Integer.MAX_VALUE));
this.scroll.setMaximumSize(new Dimension(512, Integer.MAX_VALUE));
this.pane.setText(htmlCode);
this.add(scroll);
}
}
the actual code is a bit more complex ofc. but I think this is a good approximation ...

Have you tried JTextPane with HTMLEditorKit (content type text/html)?
I think that's what you need.

Ok, the whole problem just solved itself: One had the idea to let the user write his own texts to be displayed on the tooltips, but that included letting him use multiple "spaces" for indentation when he called for it.
To let HTML render this as intended we replaced every "space" with an & nbsp; so no optimization on gaps between characters would be performed, but this of course has the result that no algorithm for automatic line wrapping would accept any "gap" between words as a suitable place to break the line.
So our implementation actually works as intended, only the Strings we give the tooltip to display are not suitable to be line broken.