Javafx font derive bold

问题

I wanted to change a (loaded) text font dinamically for my javafx application, so I did this code:

Font font = Font.loadFont(Fonts.class.getClassLoader().getResource("path/font.woff").toExternalForm(), 25);
Font bold = Font.font(font.getFamily(), FontWeight.BOLD, font.getSize());
Font italic = Font.font(font.getFamily(), FontPosture.ITALIC, font.getSize());
Font boldItalic = Font.font(font.getFamily(), FontWeight.BOLD, FontPosture.ITALIC, font.getSize());

but when I try to change the text font to bold or italic nothing changes, and I don't seem to locate some method like the one in java.awt.Font#deriveFont where you could derive italic or bold from another font.
Code to apply the font:

public void applyFont(javafx.scene.text.Text text) {
    text.setFont(font);
}

EDIT: More log:
I put some log that says what font is he getting and prints the Font#toString() result:

getFont(bold=false, italic=false) -> Font[name=<Name> Regular, family=<Name>, style=Regular, size=25.0]
getFont(bold=true, italic=false) -> Font[name=<Name> Regular, family=<Name>, style=Regular, size=25.0]
getFont(bold=false, italic=true) -> Font[name=<Name> Regular, family=<Name>, style=Regular, size=25.0]
getFont(bold=true, italic=true) -> Font[name=<Name> Regular, family=<Name>, style=Regular, size=25.0]

But if I replace the first line of code in the font loading with

font = Font.font(null, 25);//get the system's default font

It works and I get this output:

getFont(bold=false, italic=false) -> Font[name=System Regular, family=System, style=Regular, size=25.0]
getFont(bold=true, italic=false) -> Font[name=System Bold, family=System, style=Bold, size=25.0]
getFont(bold=false, italic=true) -> Font[name=System Italic, family=System, style=Italic, size=25.0]
getFont(bold=true, italic=true) -> Font[name=System Bold Italic, family=System, style=Bold Italic, size=25.0]

回答1:

You need to load another font file, that will provide appropriate Posture or Weight.

For every popular font (including System, that is used, when you call Font.font(null, 25)) there are several font files in the system: one for regular, one for italic, one for bold etc.

For instance, for Times New Roman there are four files in my Fonts folder:

Times New Roman Bold Italic.ttf
Times New Roman Bold.ttf
Times New Roman Italic.ttf
Times New Roman.ttf

来源：https://stackoverflow.com/questions/40703932/javafx-font-derive-bold

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java

javafx

fonts

javafx-8