make a JLabel wrap it’s text by setting a max width

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No.

You can use HTML in the label, but then you must hard code the break tag.

A better approach is to use a JTextArea and turn wrapping on. You can change the background,foreground, font etc. of the text are to make it look like a label.

Note, this answer is outdated as of at least Java 7.

As per @darren’s answer, you simply need to wrap the string with <html> and </html> tags:

myLabel.setText("<html>"+ myString +"</html>");

You do not need to hard-code any break tags. The text wraps as the component resizes.

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