单击JButton Java时更改字体样式

Question

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.

Answer 1

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.

Answer 2

获取当前的Font，使用deriveFont获取类似于当前的Font但具有新样式的新Font，并应用新字体。

Answer 3

you can do it as follow

JButton myButton=new JButton();
myButton.setText("My Button");
myButton.setFont(new Font("Serif", Font.BOLD, 14));

Answer 4

As an alternative, you might look at the StyledEditorKit actions available to JEditorPane . There's a related example here and a tutorial here .