자바 프로그래밍 문제

package dkssud0520; import java.awt.*; import javax.swing.*; import java.awt.event.*; import java.util.ArrayList; public class dkssud0520 extends JFrame { private JButton button, button1; private JTextField text, result; private JLabel label1, label2; private JPanel panel; private ArrayList<Integer> scores = new ArrayList<Integer>(); private class MyListener implements ActionListener { public void actionPerformed(ActionEvent e) { if(e.getActionCommand().equals("입력")) { scores.add(Integer.parseInt(text.getText()));//점수를 배열에 저장 text.setText(""); }else if(e.getActionCommand().equals("평균계산")) { int sum = 0; for(int i=0;i < scores.size();i++) sum += scores.get(i);//배열에 있는 점수를 모두 합치기 result.setText(""+ (sum / (float)scores.size()));//평균 출력 } } } public dkssud0520() { setSize(200, 200); setDefaultCloseOperation(EXIT_ON_CLOSE); panel = new JPanel(); label1 = new JLabel("성적:"); button = new JButton("입력"); button1 = new JButton("평균계산"); label2 = new JLabel("모든 학생의 평균:"); text = new JTextField(15); //text.addActionListener(new MyListener()); result = new JTextField(15); result.setEditable(false); button.addActionListener(new MyListener()); button1.addActionListener(new MyListener());//평균버튼 리스너 등록 panel.add(label1); panel.add(text); panel.add(button); panel.add(button1); panel.add(label2); panel.add(result); add(panel); setVisible(true); } public static void main(String[] args) { dkssud0520 t = new dkssud0520(); // 객체생성 } }

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