[JAVA] How to set location of JFrame to CENTER?

JFrame 화면 가운데 정렬하기

Code 1.

setSize(800, 650);

setLocationRelativeTo(null); 

Code 2.

setSize(800, 650);

setLocation((Toolkit.getDefaultToolkit().getScreenSize().width/2 - getSize().width/2), 

                  (Toolkit.getDefaultToolkit().getScreenSize().height/2 - getSize().height/2));