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
200px
50%
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