[JAVA] JFrame 디스플레이 오류? 화면이 뜨지 않습니다.

Question

코드상 문제는 없습니다.// Events.java // Program displays events that occur during execution. import javax.swing.JFrame; public class Events { public static void main(String[] args) { EventsFrame frame = new EventsFrame(); frame.setTitle("Events"); frame.setSize(375, 325); frame.setVisible(true); } // end class Events } // EventsFrame.java // Program displays events that occur during execution. import java.awt.Color; import java.awt.BorderLayout; // containers import javax.swing.JFrame; import javax.swing.JPanel; // GUI elements that should be added to containers import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.JComboBox; import javax.swing.JRadioButton; import javax.swing.JList; import javax.swing.JButton; // Event Listener Interfaces import java.awt.event.ActionListener; import java.awt.event.ActionEvent; import java.awt.event.ItemListener; import java.awt.event.ItemEvent; import java.awt.event.MouseListener; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionListener; import java.awt.event.KeyListener; import java.awt.event.KeyEvent; import javax.swing.event.ListSelectionListener; import javax.swing.event.ListSelectionEvent; public class EventsFrame extends JFrame implements ActionListener, ItemListener, MouseListener, MouseMotionListener, KeyListener, ListSelectionListener { private JPanel panel1; private JScrollPane scrollPane; private JTextArea outputJTextArea; private JComboBox comboBox; private JRadioButton radioButton; private JList list; private JButton clearJButton; private String[] names = { "Anteater", "Caterpillar", "Centipede", "Fire Fly"}; // set up GUI and register event handlers public EventsFrame() { super("Events"); // create GUI components outputJTextArea = new JTextArea(10, 30); outputJTextArea.setLineWrap(true); outputJTextArea.setEditable(false); outputJTextArea.setBackground(Color.WHITE); outputJTextArea.setForeground(Color.BLACK); // add the output area to a scroll pane // so the user can scroll the output scrollPane = new JScrollPane(outputJTextArea); // comboBox listens for item and key events comboBox = new JComboBox(names); comboBox.addItemListener(this); comboBox.addKeyListener(this); // radioButton listens for action events radioButton = new JRadioButton("Select Me", false); radioButton.addActionListener(this); // list listens for list selection events list = new JList(names); list.addListSelectionListener(this); // clear button for clearing the output area clearJButton = new JButton("Clear"); clearJButton.addActionListener( new ActionListener() // anonymous inner class { public void actionPerformed(ActionEvent event) { outputJTextArea.setText(""); } } // end anonymous inner class ); // end call to addActionListener // application listens to its own key and mouse events addMouseMotionListener(this); addMouseListener(this); panel1 = new JPanel(); panel1.add(comboBox); panel1.add(radioButton); panel1.add(list); panel1.add(clearJButton); // add components to container add(scrollPane, BorderLayout.CENTER); add(panel1, BorderLayout.SOUTH); } // ActionListener event handlers public void actionPerformed(ActionEvent event) { display("ActionEvent", event); } // ItemListener event handlers public void itemStateChanged(ItemEvent event) { display("ItemEvent", event); } // MouseListener event handlers public void mouseClicked(MouseEvent event) { display("MouseEvent", event); } public void mouseEntered(MouseEvent event) { display("MouseEvent", event); } public void mouseExited(MouseEvent event) { display("MouseEvent", event); } public void mousePressed(MouseEvent event) { display("MouseEvent", event); } public void mouseReleased(MouseEvent event) { display("MouseEvent", event); } // MouseMotionListener event handlers public void mouseDragged(MouseEvent event) { display("MouseEvent", event); } public void mouseMoved(MouseEvent event) { display("MouseEvent", event); } // KeyListener event handlers public void keyPressed(KeyEvent event) { display("KeyEvent", event); } public void keyReleased(KeyEvent event) { display("KeyEvent", event); } public void keyTyped(KeyEvent event) { display("KeyEvent", event); } // ListSelectionListener event handlers public void valueChanged(ListSelectionEvent event) { display("ListSelectionEvent", event); } // display event occurred to output public void display(String eventName, Object event) { outputJTextArea.append(String.format("%s occurred %S ", eventName, event.toString())); } } // end class EventsFrame 코드상 오류는 없습니다만 컴파일을 했을 때 구현했던 Color나 Listener 가 그림형태가 아닌, 아래 이미지처럼 코드형태로 보여지네요.. 뭐가 문제일까요? java 버젼은 최신버젼입니다.

답정너심판자 · Accepted Answer

outputJTextArea.append(String.format(&#34;%s occurred
%S

&#34;, eventName, event.toString()))님이 보여주신 소스 자체가, 글자만 보여지게끔 되어있는디유...

김인직 · Answer

JDK도 업데이트 했습니다.

[JAVA] JFrame 디스플레이 오류? 화면이 뜨지 않습니다.

2개의 답변

#jframe 목록