如何让JFrame显示在屏幕中间？

1.double width = Toolkit.getDefaultToolkit().getScreenSize().getWidth();

double height = Toolkit.getDefaultToolkit().getScreenSize().getHeight();

setLocation( (int) (width - this.getWidth()) / 2,(int) (height - this.getHeight()) / 2);

show();

2.frame.setLocation( (screenSize.width - frameSize.width) / 2,

(screenSize.height - frameSize.height) / 2);

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