java swing标准对话框具体实现

package test001;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JOptionPane;import javax.swing.JToolBar;public class TestJOptionPane implements ActionListener{    private JFrame jf = new JFrame("标准对话框测试");    /**     * @param args     */    public static void main(String[] args) {        // TODO Auto-generated method stub        new TestJOptionPane().createUI();    }    public void createUI(){        JToolBar jtb = new JToolBar();        String[] s = {"错误", "退出确认1", "退出确认2", "警告", "输入", "选择"};        int size = s.length;        JButton[] button = new JButton[size];        for(int i = 0; i < size; i++){            button[i] = new JButton(s[i]);            button[i].addActionListener(this);            jtb.add(button[i]);        }        jf.add(jtb, "North");        jf.setSize(350, 150);        jf.setLocation(400, 200);        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        jf.setVisible(true);    }    @Override    public void actionPerformed(ActionEvent e) {        // TODO Auto-generated method stub        String s = e.getActionCommand();        if(s.equals("错误")){            JOptionPane.showMessageDialog(null, "要显示的错误信息---",                    "错误提示",JOptionPane.ERROR_MESSAGE);        }        else if(s.equals("退出确认1")){            int result = JOptionPane.showConfirmDialog(null,                     "推出前是否保存程序？");            if(result == JOptionPane.YES_OPTION){                System.out.println("保存程序---");                System.exit(0);            }            else if(result == JOptionPane.NO_OPTION){                System.exit(0);            }        }        else if(s.equals("退出确认2")){            int result = JOptionPane.showConfirmDialog(null, "退出前是否保存程序？");            if(result == JOptionPane.YES_OPTION){                System.out.println("保存程序---");                System.exit(0);            }            else if(result == JOptionPane.NO_OPTION){                System.exit(0);            }        }        else if(s.equals("警告")){            Object[] options = {"继续", "撤销"};            int result = JOptionPane.showOptionDialog(null,                    "本操作可能导致数据丢失","Warning", JOptionPane.DEFAULT_OPTION,                    JOptionPane.WARNING_MESSAGE, null, options, options[0]);            if(result == 0){                System.out.println("继续操作---");            }        }        else if(s.equals("输入")){            String name = JOptionPane.showInputDialog("请输入您的姓名：");            if(name != null){                System.out.println("姓名：" + name);            }        }        else if(s.equals("选择")){            Object[] possibleValues = {"体育", "政治", "经济", "文化"};            Object selectedValue = JOptionPane.showInputDialog(null,                     "Choose one","Input", JOptionPane.INFORMATION_MESSAGE, null,                    possibleValues, possibleValues[0]);            String choose = (String)selectedValue;            if(choose != null){                System.out.println("你选择的是："+ choose);            }        }    }}