package java0806; import java.awt.BorderLayout;import java.awt.Container; import javax.swing.JButton;import javax.swing.JFrame; public class BorderLayoutEx extends JFrame { public BorderLayoutEx() {setTitle("BorderLayout 연습");setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container c = getContentPane();c.setLayout(new BorderLayout(30, 20));c.add(new JButton("계산하기"), BorderLayout.CENTER);c.add(n..