Text wrap in JOptionPane?

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A JOptionPane will use a JLabel to display text by default. A label will format HTML. Set the maximum width in CSS.

JOptionPane.showMessageDialog(
    this, 
    "<html><body><p style="width: 200px;">"+exp.getMessage()+"</p></body></html>", 
    "Error", 
    JOptionPane.ERROR_MESSAGE);

More generally, see How to Use HTML in Swing Components, as well as this simple example of using HTML in JLabel.


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