JAVA swing.JFrame 的屏幕居中代码

JFrame frame = new JFrame("Data Display");

frame.setSize(630,430);
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Dimension frameSize = frame.getSize();
frame.setLocation( (screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);

// set frame visible is true, then we can see it.
frame.setVisible(true);