Word Wrap in JButtons

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This example uses Java’s inbuilt CSS rendering abilities to to do the ‘heavy lifting’ of determining when to do a line break. It uses a JLabel, but the same principles apply to any component that will render HTML.

FixedWidthText.java

import javax.swing.*;

class FixedWidthText {

    public static void showLabel(int width, String units) {
        String content1 = "<html>"
                + "<body style="background-color: white; width: ";
        String content2 = "">"
                + "<h1>Fixed Width</h1>"
                + "<p>Body width fixed at ";
        String content3
                = " using CSS.  "
                + "Java's HTML"
                + " support includes support"
                + " for basic CSS.</p>";
        final String content = content1 + width + units
                + content2 + width + units + content3;
        Runnable r = () -> {
            JLabel label = new JLabel(content);
            JOptionPane.showMessageDialog(null, label);
        };
        SwingUtilities.invokeLater(r);
    }

    public static void main(String[] args) {
        showLabel(160, "px");
        showLabel(200, "px");
        showLabel(50, "%");
    }
}

Screen shots

160px

enter image description here

200px

enter image description here

50%

enter image description here

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