Java Utililty Methods JFrame Center

for (Container c = COMPONENT; c != null; c = c.getParent()) {
    if (c instanceof Frame) {
        return (Frame) c;
return null;

Dimension d = frame.getSize();
double x = d.getWidth() / 2.0 - 150;
double y = d.getHeight() / 2.0 - 50;
Rectangle r = new Rectangle((int) x, (int) y, 0, 0);
return r;

GraphicsConfiguration gc = frame.getGraphicsConfiguration();
int screenHeight = (int) gc.getBounds().getHeight();
int screenWidth = (int) gc.getBounds().getWidth();
int windowWidth = frame.getWidth();
int windowHeight = frame.getHeight();
frame.setLocation((screenWidth - windowWidth) / 2, (screenHeight - windowHeight) / 2);

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

Toolkit tk = Toolkit.getDefaultToolkit();
Dimension screenSize = tk.getScreenSize();
window.pack();
int leftCoordinate = (screenSize.width / 2) - (window.getWidth() / 2);
int topCoordinate = (screenSize.height / 2) - (window.getHeight() / 2);
window.setLocation(leftCoordinate, topCoordinate);

Dimension screenSize = new Dimension(Toolkit.getDefaultToolkit().getScreenSize());
Dimension windowSize = new Dimension(frame.getPreferredSize());
int wdwLeft = screenSize.width / 2 - windowSize.width / 2;
int wdwTop = screenSize.height / 2 - windowSize.height / 2;
frame.pack();
frame.setLocation(wdwLeft, wdwTop);

aFrame.setSize(aWidth, aHeight);
aFrame.setLocationRelativeTo(null);