javafx 2 - Set BorderPane components size -

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i want set size of center, top, left, right , bottom components of borderpane.

enter image description here

so far found this:

borderpane() mainpane = new borderpane(); mainpane.getbottom().prefwidth(sizex);

for example how can size of left side of borderpane , set size?

the "left" of borderpane whatever set , it's size whatever set to.

example:

borderpane mainpane = new borderpane(); stackpane left = new stackpane(); left.setprefwidth(100); mainpane.setleft(left);

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