質問編集履歴
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            ###該当のソースコード
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            ```java
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            package reidai; 
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            import java.awt.BorderLayout; 
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            import java.awt.EventQueue; 
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            import javax.swing.ButtonGroup; 
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            import javax.swing.JFrame; 
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            import javax.swing.JPanel; 
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            import javax.swing.border.EmptyBorder; 
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            import javax.swing.JScrollPane; 
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            import javax.swing.JList; 
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            import javax.swing.JTextField; 
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            import java.awt.FlowLayout; 
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            import javax.swing.JLabel; 
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            import java.awt.Dimension; 
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            import javax.swing.JButton; 
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            import java.awt.event.ActionListener; 
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            import java.awt.event.ActionEvent; 
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            import java.io.BufferedReader; 
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            import java.io.File; 
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            import java.io.FileReader; 
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            import java.io.IOException; 
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            import javax.swing.event.ListSelectionListener; 
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            import javax.swing.event.ListSelectionEvent; 
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            import java.awt.GridLayout; 
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            import java.awt.Component; 
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            import javax.swing.SwingConstants; 
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            import javax.swing.ScrollPaneConstants; 
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            import java.util.ArrayList; 
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            import java.awt.BorderLayout; 
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            import java.awt.EventQueue; 
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            import java.awt.event.ActionEvent; 
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            import javax.swing.JRadioButton; 
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            import javax.swing.JComboBox; 
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            public class Rei4_09 extends JFrame { 
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            private static final long serialVersionUID = 1L; 
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            private JPanel contentPane; 
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            private JPanel panelCenter; 
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            private JTextField textField01; 
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            private JTextField textField02; 
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            private JTextField textField03; 
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            private JLabel label01; 
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            private JLabel label02; 
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            private JScrollPane scrollPane; 
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            private JList list; 
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            private JList list1; 
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            private JLabel label03; 
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            private JButton button; 
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            private JPanel panel4; 
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            private JPanel panel3; 
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            private JPanel panel2; 
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            private JPanel panel1; 
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            private JRadioButton radioButton01; 
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            private JRadioButton radioButton02; 
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            private JComboBox comboBox; 
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            private JRadioButton aBunkabu; 
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            private JRadioButton aUndoubu; 
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            private final static int MAX=60; 
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            private int buinsu[]; 
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            private int buinsu1[]; 
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            private String[] aseito=new String[MAX]; 
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            private String[] bseito=new String[MAX]; 
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            public static void main(String[] args) { 
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            EventQueue.invokeLater(new Runnable() { 
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            public void run() { 
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            try { 
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            Rei4_09 frame = new Rei4_09(); 
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            frame.setVisible(true); 
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            } catch (Exception e) { 
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            e.printStackTrace(); 
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            } 
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            } 
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            }); 
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            }
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            public Rei4_09() { 
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            setTitle("リストとファイル"); 
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            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
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            setBounds(100, 100, 700,250); 
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            contentPane = new JPanel(); 
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            contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); 
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            contentPane.setLayout(new BorderLayout(0, 0)); 
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            setContentPane(contentPane); 
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            panelCenter = new JPanel(); 
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            contentPane.add(panelCenter, BorderLayout.CENTER); 
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            panelCenter.setLayout(new GridLayout(2, 1, 0, 0)); 
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            panel1 = new JPanel(); 
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            panel1.setAlignmentY(Component.BOTTOM_ALIGNMENT); 
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            panelCenter.add(panel1); 
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            panel1.setLayout(new GridLayout(6, 1, 0, 0)); 
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            label01 = new JLabel("クラブ名"); 
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            panel1.add(label01); 
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            label01.setHorizontalAlignment(SwingConstants.LEFT); 
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            textField01 = new JTextField(); 
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            panel1.add(textField01); 
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            textField01.setColumns(10); 
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            label02 = new JLabel("部員数"); 
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            label02.setHorizontalAlignment(SwingConstants.LEFT); 
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            panel1.add(label02); 
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            textField02 = new JTextField(); 
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            panel1.add(textField02); 
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            textField02.setColumns(10); 
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            label03 = new JLabel("クラブ名2"); 
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            panel1.add(label03); 
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            label03.setHorizontalAlignment(SwingConstants.LEFT); 
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            textField03 = new JTextField(); 
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            panel1.add(textField03); 
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            textField03.setColumns(10); 
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            panel2 = new JPanel(); 
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            FlowLayout fl_panel2 = (FlowLayout) panel2.getLayout(); 
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            fl_panel2.setAlignment(FlowLayout.RIGHT); 
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            panelCenter.add(panel2); 	
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            radioButton01 = new JRadioButton("運動部");
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            		radioButton01.addActionListener(new ActionListener() {
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            			public void actionPerformed(ActionEvent e) {
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            					ArrayList<String> tmpAL=new ArrayList<String>(MAX);
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