用动态数组保存学生姓名

import java.awt.BorderLayout;  import java.awt.EventQueue;    import javax.swing.AbstractListModel;  import javax.swing.DefaultListModel;  import javax.swing.JFrame;  import javax.swing.JPanel;  import javax.swing.ListModel;  import javax.swing.border.EmptyBorder;  import javax.swing.JScrollPane;  import javax.swing.JList;  import java.awt.FlowLayout;  import javax.swing.JButton;  import java.awt.Dimension;  import javax.swing.JLabel;  import java.awt.event.ActionListener;  import java.awt.event.ActionEvent;  import java.util.ArrayList;  import javax.swing.JTextField;  import javax.swing.UIManager;  import javax.swing.JPopupMenu;  import java.awt.Component;  import java.awt.event.MouseAdapter;  import java.awt.event.MouseEvent;  import javax.swing.JComboBox;    public class DynamicArray extends JFrame {            private JPanel contentPane;      private final JPanel panel = new JPanel();            /**      * Launch the application.      */      public static void main(String[] args) {          try {              UIManager                      .setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");          } catch (Throwable e) {              e.printStackTrace();          }          EventQueue.invokeLater(new Runnable() {              public void run() {                  try {                      DynamicArray frame = new DynamicArray();                      frame.setVisible(true);                  } catch (Exception e) {                      e.printStackTrace();                  }              }          });      }            /**      * Create the frame.      */      public DynamicArray() {          setTitle("\u7528\u52A8\u6001\u6570\u7EC4\u4FDD\u5B58\u5B66\u751F\u59D3\u540D");          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);          setBounds(100, 100, 337, 269);          contentPane = new JPanel();          contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));          contentPane.setLayout(new BorderLayout(0, 0));          setContentPane(contentPane);                    JScrollPane scrollPane = new JScrollPane();          contentPane.add(scrollPane, BorderLayout.CENTER);                    list = new JList();          scrollPane.setViewportView(list);                    JPanel panel_1 = new JPanel();          scrollPane.setColumnHeaderView(panel_1);                    JLabel label = new JLabel("\u5B66\u751F\u59D3\u540D\uFF1A");          panel_1.add(label);                    textField = new JTextField();          panel_1.add(textField);          textField.setColumns(10);          panel.setPreferredSize(new Dimension(100, 10));          contentPane.add(panel, BorderLayout.EAST);          panel.setLayout(new FlowLayout(FlowLayout.CENTER, 5, 5));                    JButton button = new JButton("\u6DFB\u52A0\u5B66\u751F");          button.addActionListener(new ActionListener() {              public void actionPerformed(ActionEvent e) {                  do_button_actionPerformed(e);              }          });          panel.add(button);                    JButton button_1 = new JButton("\u5220\u9664\u5B66\u751F");          button_1.addActionListener(new ActionListener() {              public void actionPerformed(ActionEvent e) {                  do_button_1_actionPerformed(e);              }          });          panel.add(button_1);      }            private ArrayList<String> arraylist = new ArrayList<String>();      private JTextField textField;      private JList list;            protected void do_button_actionPerformed(ActionEvent e) {          textField.requestFocusInWindow();          textField.selectAll();// 选择文本框文本准备下次输入          String text = textField.getText();// 获取用户输入姓名          if (text.isEmpty())// 过滤为输入姓名的情况              return;          arraylist.add(text);// 把姓名添加到数组集合中          replaceModel();// 把数组集合中内容显示到界面列表控件中      }            protected void do_button_1_actionPerformed(ActionEvent e) {          Object value = list.getSelectedValue();// 获取列表控件的选择项          arraylist.remove(value);// 从数组集合中移除用户的选择项          replaceModel();// 把数组集合中内容显示到界面列表控件中      }            private void replaceModel() {          // 为列表控件设置数据模型显示数组集合中的数据          list.setModel(new AbstractListModel() {              @Override              public int getSize() {// 获取数组大小                  return arraylist.size();              }                            @Override              public Object getElementAt(int index) {// 获取指定索引元素                  return arraylist.get(index);              }          });      }  }