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javaswingfontsjbutton

Changing Font Style when Clicking on a JButton Java

How to change the STYLE of the Font when clicking on a JButton ?

I'm trying to have 3 buttons each change styles to PLAIN or BOLD or ITALIC

I've read the font Class API but I there is nothing like setStyle we can only getStyle

I find font class in java is quite complicated more than it should :S.

Solution

  • You would need to call setFont(...) not setStyle.

    For example, if you want to keep the same font but change the style of a JTextField called "field" you could do something like:

    field.setFont(field.getFont().deriveFont(Font.BOLD));

    Edit
    To set the font to both bold and italic, you'd or the bitmaps:

    field.setFont(field.getFont().deriveFont(Font.BOLD | Font.ITALIC));

    Please note that this uses the bitwise inclusive OR operator which uses a single pipe symbol: | rather than the logical OR operator which uses a double pipe symbol: ||.

    Also note for further subtlety and confusion that | can be used as a logical OR operator, but you'll usually prefer to use || for this since the latter is a "short-circuit" operator in that if the left hand side of the expression is true, the right hand side isn't even evaluated.