newline character in JLabel.setText()

Question

How can I insert a newline when I am using JLabel.setText()? I tried to use Html but can seem to make it work for setText, only for the initial declaration of the jLabel

the way to do it when initially declaring the jlabel is:

label = new JLabel("<html>Hello World!<br>blahblahblah</html>");

my code:

textString += "<html> quantityTextField.getText() +
   theInventory.findItem(UPCTextField.getText()).toString() + <br> </html>";

purchaseInfo.setText( textString);

it displays the html tags and the method names instead of the string returned by the methods

Please include an [sscce](http://www.sscce.org), otherwise we'll all be left shooting in the dark. — mre, Oct 05 '11 at 19:30

Ernest Friedman-Hill · Answer 1 · 2011-10-05T19:43:21.740

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If your setText() call changes the preferred dimensions of the JLabel, then you need to call revalidate() on the container to get the layout redone.

Looking at the code snippet you've added, I see a
at the very end of the line -- which won't really do anything anyway -- and a lot of misquoted method calls which are done such that the method names are part of the HTML. If you do something along the lines of

label.setText("<html>Hello World!<br>blahblahblah</html>");
label.getParent().revalidate();

your newline ought to show up.

edited Oct 05 '11 at 19:43

answered Oct 05 '11 at 19:23

Ernest Friedman-Hill

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but how do I insert a newline? – trs Oct 05 '11 at 19:38
What's not relevant? If there's single-line text, and he calls setText(), he's not going to see a second line without redoing the layout. – Ernest Friedman-Hill Oct 05 '11 at 19:44
Only true if the label exceeds the dimensions of its container, otherwise not true at all. – mre Oct 05 '11 at 19:45
@trs For a newline, just do `\n` – fireshadow52 Oct 05 '11 at 19:48
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The setText() method automatically does a revalidate() and repaint(). You only manually invoke repaint() when you add/remove components from a parent container. – camickr Oct 05 '11 at 19:57

score 4 · Answer 2 · answered Oct 05 '11 at 19:39

The formatting of your text is all wrong. This is the string that you're currently setting:

"<html>Hello World!<br>blahblahblah</html><html> quantityTextField.getText()+ theInventory.findItem(UPCTextField.getText()).toString() + <br> </html>"

Now tell me the problem isn't painfully obvious (by the way, HTML isn't your only problem)... Anyway, for more information, please see How to Use HTML in Swing Components.

score 2 · Answer 3 · answered Oct 05 '11 at 19:44

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textString+="<html> " + quantityTextField.getText()+ theInventory.findItem(UPCTextField.getText()).toString() + "<br> </html>";

funny.

answered Oct 05 '11 at 19:44

MarianP

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well, you included your 'method calls' in the string, so they were not evaluated. "quantityTextField.getText()" is a String, quantityTextField.getText() returns result of a call to the method. – MarianP Oct 05 '11 at 20:12

score 0 · Answer 4 · edited May 23 '17 at 12:00

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Anyone not testing their answer should qualify it with "I think".

As others have said, \n won't work, .revalidate() isn't necessary, and html is. See Newline in JLabel

edited May 23 '17 at 12:00

Community

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answered Aug 07 '14 at 18:27

gherson

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score 0 · Answer 5 · answered Aug 20 '19 at 12:09

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Hello bro insert your new line between "pre"

JLabel l=new JLabel("<html><pre>Hello world\nBlahblahblah</pre></html>");

i hope this help you

answered Aug 20 '19 at 12:09

01010011 01010101 01001111

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score 0 · Answer 6 · answered Oct 05 '11 at 19:43

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You appear to be concatenating something with your html string.

Surround the text in the <html> tags and only use the <html> tags once.

answered Oct 05 '11 at 19:43

Garrett Hall

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Do a System.out on 'textString' and tell us what it is. – Garrett Hall Oct 05 '11 at 20:42

score 0 · Answer 7 · answered Oct 07 '11 at 01:10

In personal experience, I wouldn't use HTML tags in a JLabel. If you're not doing any formatting (which it looks like you aren't, other than inserting a line break), you're better off using character codes like '\n' because of simplicity and size.

[code] label = new JLabel("Hello World!\nblahblahblah");

textString += quantityTextField.getText() + theInventory.findItem(UPCTextField.getText()).toString() + "\n";

purchaseInfo.setText( textString); [/code]

The reason the method names were showing up was because you had them enclosed within quotes. It was taking the methods as actual text to write to the screen, not a set of instructions to perform.

newline character in JLabel.setText()

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