AWT 예제

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public class ChatCS extends Frame {     private static final long serialVersionUID = 1L;           public ChatCS() {         addWindowListener(new WindowAdapter() {             @Override             public void windowClosing(WindowEvent arg0) {                 System.exit(0); //windowClosing : x버튼으로 종료 시 실행됨             }         });     }           public static void main(String[] args) {         new ChatCS();     } }?

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public class ChatCS extends Frame implements ActionListener {     private static final long serialVersionUID = 1L;     private TextField tf;     private TextArea ta;           public ChatCS() {         tf = new TextField();         add(tf, BorderLayout.SOUTH);         ta = new TextArea();         add(ta, BorderLayout.CENTER);         tf.addActionListener(this);                   addWindowListener(new WindowAdapter() {             @Override             public void windowClosing(WindowEvent e) {                 System.exit(0);             }               });                   setTitle("UDP프로그램");         setSize(500, 450);         setVisible(true);     }           public static void main(String[] args) {         new ChatCS();     }       @Override     public void actionPerformed(ActionEvent e) {         Component ob = (Component)e.getSource();           if(ob instanceof TextField) {             try {                 String s = tf.getText().trim();                 if(s.length() ==0)                     return;               } catch (Exception e2){}         }     } }