让x0和y0在jframe中从中心开始？

JFrame frame = new JFrame();
frame.setSize(800, 600);
frame.setTitle("My JFrame");

int screenWidth = Toolkit.getDefaultToolkit().getScreenSize().width;
int screenHeight = Toolkit.getDefaultToolkit().getScreenSize().height;

int x0 = (screenWidth - frame.getWidth()) / 2;
int y0 = (screenHeight - frame.getHeight()) / 2;

frame.setLocation(x0, y0);

frame.setVisible(true);