How to change the size of the font of a JLabel to take the maximum size

Question

I have a JLabel in a Container  The defaut size of the font is very small  I would like that the text of the JLabel to take the maximum size   How can I do that

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JLabel label   new JLabel  Hello World    label setFont new Font  Calibri   Font BOLD  20

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label   new JLabel  A label    label setFont new Font  Serif   Font PLAIN  14      taken from How to Use HTML in Swing Components

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Not the most pretty code  but the following will pick an appropriate font size for a JLabel called label such that the text inside will fit the interior as much as possible without overflowing the label   Font labelFont   label getFont    String labelText   label getText     int stringWidth   label getFontMetrics labelFont  stringWidth labelText   int componentWidth   label getWidth        Find out how much the font can grow in width  double widthRatio    double componentWidth    double stringWidth   int newFontSize    int  labelFont getSize     widthRatio   int componentHeight   label getHeight        Pick a new font size so it will not be larger than the height of label  int fontSizeToUse   Math min newFontSize  componentHeight       Set the label s font size to the newly determined size  label setFont new Font labelFont getName    Font PLAIN  fontSizeToUse      Basically  the code looks at how much space the text in the JLabel takes up by using the FontMetrics object  and then uses that information to determine the largest font size that can be used without overflowing the text from the JLabel   The above code can be inserted into perhaps the paint method of the JFrame which holds the JLabel  or some method which will be invoked when the font size needs to be changed   The following is an screenshot of the above code in action     source  coobird net

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Source Code for Label - How to change Color and Font  in Netbeans   jLabel1 setFont new Font  Serif   Font BOLD  12      jLabel1 setForeground Color GREEN

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Just wanted to point out that the accepted answer has a couple of limitations  which I discovered when I tried to use it    As written  it actually keeps recalculating the font size based on a ratio of the previous font size    thus after just a couple of calls it has  rendered the font size as much too large    eg Start with 12 point as your DESIGNED Font  expand the label by just 1 pixel  and the published code will calculate the Font size as 12    say  1 2  ratio of field space to text    14 4 or 14 point font   1 more Pixel and call and you are at 16 point       It is thus not suitable  without adaptation  for use in a repeated-call setting  eg a ComponentResizedListener  or a custom modified LayoutManager    The listed code effectively assumes a starting size of 10 pt but refers to the current font size and is thus suitable for calling once  to set the size of the font when the label is created    It would work better in a multi-call environment if it did int newFontSize    int   widthRatio   10   rather than int newFontSize    int  labelFont getSize     widthRatio     Because it uses new Font labelFont getName    Font PLAIN  fontSizeToUse   to generate the new font  there is no support for Bolding  Italic or Color etc from the original font in the updated font   It would be more flexible if it made use of labelFont deriveFont instead   The solution does not provide support for HTML label Text    I know that was probably not ever an intended outcome of the answer code offered  but as I had an HTML-text JLabel on my JPanel I formally discovered the limitation  The FontMetrics stringWidth   calculates the text length as inclusive of the width of the html tags - ie as simply more text    I recommend looking at the answer to this SO question where trashgod s answer points to a number of different answers  including this one  to an almost identical question   On that page I will provide an additional answer that speeds up one of the other answers by a factor of 30-100

User · Answer

JLabel textLabel   new JLabel   lt html gt  lt span style  font-size 20px  gt   Text   lt  span gt  lt  html gt

[java] How to change the size of the font of a JLabel to take the maximum size

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