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import java.awt.*; import java.awt.event.*; import javax.swing.*; public class KeyDemo extends JFrame implements KeyListener { private String [] area={"한국","중국","미국","미국","일본","캐나다","호주","러시아","프랑스","사우디"}; private String line1; private JTextField text; private JLabel jh; public KeyDemo() { super( "Demonstrating Keystroke Events" ); jh=new JLabel("숫자를 입력하세요"); text=new JTextField(20); setLayout(..

import java.awt.*; import java.awt.event.*; import javax.swing.*; public class CalculatorGUI extends JFrame implements ActionListener{ JTextField lblPrint; Calculator cc = new Calculator(); boolean flag; public CalculatorGUI(String title){ super(title); JPanel panel = new JPanel(new BorderLayout()); lblPrint = new JTextField(); panel.add(lblPrint,BorderLayout.NORTH); JPanel panelCal= new JPanel(..