DefaultListModel model = new DefaultListModel();
JList list = new JList(model);

------解决方案--------------------
Java code

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Vector;

import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JSplitPane;
import javax.swing.JTextField;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;


public class MainFrame extends JFrame implements ActionListener,ListSelectionListener {
    private JTextField name;
    private JTextField age;
    private JTextField tel;
    private JRadioButton man;
    private JRadioButton women;
    private JButton add;
    private JButton del;
    private JList list;
    private Vector<Student> students;
    
    public MainFrame() {
        //创建输入信息的部分开始
        name = new JTextField(20);
        age = new JTextField(20);
        tel = new JTextField(20);
        man = new JRadioButton("男");
        man.setSelected(true);
        women = new JRadioButton("女");
        JPanel input = new JPanel();
        input.setLayout(new FlowLayout());
        input.setSize(50, 150);
        JPanel p1 = new JPanel();
        p1.add(new JLabel("姓名:"));
        p1.add(name);
        input.add(p1);
        JPanel p2 = new JPanel();
        p2.add(new JLabel("年龄:"));
        p2.add(age);
        input.add(p2);
        JPanel p3 = new JPanel();
        p3.add(new JLabel("电话:"));
        p3.add(tel);
        input.add(p3);
        JPanel p4 = new JPanel();
        p4.add(new JLabel("性别:"));
        p4.add(man);
        p4.add(women);
        input.add(p4);
        //加入到ButtonGroup中。这样的话同时只能选中一个。
        ButtonGroup bg = new ButtonGroup();
        bg.add(man);
        bg.add(women);
        //创建输入信息的部分结束
        
        //创建按钮部分开始
        add = new JButton("增加");
        add.addActionListener(this);
        
        del = new JButton("删除");
        del.addActionListener(this);
        
        JPanel buttons = new JPanel();
        buttons.add(add);
        buttons.add(del);
        this.add(buttons,BorderLayout.NORTH);
        //创建按钮部分结束
        
        //创建JList部分开始
        students = new Vector<Student>();
        Student stu = new Student();
        stu.setName("liuming");
        //students.add(stu);
        list = new JList(students);
        list.addListSelectionListener(this);
        //创建JList部分开始
        
        JSplitPane jsp = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
        jsp.setDividerLocation(350);
        jsp.setDividerSize(3);
        jsp.setLeftComponent(input);
        jsp.setRightComponent(list);
        this.add(jsp);
        
        this.setTitle("简单学生信息管理");
        this.setSize(500,400);
        this.setResizable(false);
        this.setVisible(true);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
    
    //处理按钮事件
    public void actionPerformed(ActionEvent e) {
        if(e.getSource() == add) {
            if(check())
                return;
            Student student = new Student();
            student.setName(name.getText());
            student.setAge(Integer.parseInt(age.getText()));
            if(man.isSelected()) {
                student.setSex("男");
            } else if(women.isSelected()) {
                student.setSex("女");
            }
            student.setTel(tel.getText());
            students.add(student);
            list.setListData(students);
            list.repaint();
            JOptionPane.showMessageDialog(this, "添加学生信息成功！");
        } else if(e.getSource() == del) {
            int index = list.getSelectedIndex();
            if(index >= 0) {
                Student stu = students.remove(index);
                list.setListData(students);
                list.repaint();
                JOptionPane.showMessageDialog(this, "删除学生" + stu.getName() + "的信息成功！");
            } else {
                JOptionPane.showMessageDialog(this, "没有选中学生！");
            }
        }
    }
    
    //判断是否输入有空值，年龄是否是数字
    private boolean check() {
        boolean flag = false;
        if(name.getText().equals("")) {
            flag = true;
            JOptionPane.showMessageDialog(this, "姓名不能为空！");
        } else if(age.getText().equals("")) {
            flag = true;
            JOptionPane.showMessageDialog(this, "年龄不能为空！");
        } else if(tel.getText().equals("")) {
            flag = true;
            JOptionPane.showMessageDialog(this, "电话不能为空！");
        } else if(!age.getText().matches("(\\d)++")) {
            flag = true;
            JOptionPane.showMessageDialog(this, "年龄必须为的数字！");
        }
        return flag;
    }
    
    //处理JList的值改变的事件
    public void valueChanged(ListSelectionEvent e) {
        int index = list.getSelectedIndex();
        Student stu = students.get(index);
        String info = "姓名:" + stu.getName() + "\n年龄:" + stu.getAge() + "\n性别:" + stu.getSex() + "\n电话:" + stu.getTel();
        JOptionPane.showMessageDialog(this, info);
    }
    
    public static void main(String[] args) {
        new MainFrame();
    }
}