FlowLayout.CENTER has the following syntax.
public static final int CENTER
In the following code shows how to use FlowLayout.CENTER field.
import java.awt.FlowLayout; /*www. ja va2s.c om*/ import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class Main extends JPanel { public Main() { super(new FlowLayout(FlowLayout.CENTER, 10, 3)); add(new JButton("w w w.j a v a 2 s . c o m")); add(new JButton("w w w.j a v a 2 s . com")); add(new JButton("w w w.java2s.com")); add(new JButton("www.j ava 2 s . c o m")); } public static void main(String[] args) { JFrame frame = new JFrame(); frame.add(new Main()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(200, 200); frame.setVisible(true); } }