求高手指教，自己写的程序不能实现功能，不知道哪错了
这是一个数据库查询的程序：public class QPhone extends JFrame{
/**
*
*/
private static final long serialVersionUID = 1L;
public static JTextField input1 = new JTextField();
public static JTextField input2 = new JTextField();
private static JTextArea infoshow = new JTextArea();
private Label l1 = new Label("科室代码：");
private Label l2 = new Label("电话号码：");
static Connection con;
static Statement st;
static InputStreamReader isr;
static BufferedReader br;
static String dm = null;
static String hm = null;
static String n1;
static String t1;
static String n2;
static String t2;
public QPhone(){
this.setTitle("电话查询");
this.setLayout(null);
this.setSize(500, 600);
this.setLocation(500, 100);
l1.setBounds(0, 0, 70, 25);
this.add(l1);
l2.setBounds(0, 30, 70, 25);
this.add(l2);
input1.setBounds(75, 0, 350, 25);
input1.addKeyListener(new KeyAdapter() {
public void keyTyped(KeyEvent evt) {
try {
jTextField1KeyTyped(evt);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
this.add(input1);
input2.setBounds(75, 30, 350, 25);
input2.addKeyListener(new KeyAdapter() {
public void keyTyped(KeyEvent evt) {
try {
jTextField2KeyTyped(evt);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
this.add(input2);
infoshow.setEditable(false);
JScrollPane jsp = new JScrollPane(infoshow);
jsp.setBounds(75, 60, 350, 380);
this.add(jsp);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
new QPhone();
dm = input1.getText();
hm = input2.getText();
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}catch(java.lang.ClassNotFoundException e){
System.out.println(e);
}
try{
con = DriverManager.getConnection("jdbc:odbc:phone", "", "");
st = con.createStatement();
if(dm != null && hm == null)
{
ResultSet rs = st.executeQuery("SELECT name,tel FROM [Sheet1$] WHERE DM = '"+dm+"'");
while(rs.next()){
n1 = rs.getString(1);
t1 = rs.getString(2);
//infoshow.append(n1 + ":" + t1 + "\n");
}
}
if(dm == null && hm != null){
ResultSet rs = st.executeQuery("SELECT name,tel FROM [Sheet1$] WHERE TEL LIKE '%"+hm+"%'");
while(rs.next()){
n2 = rs.getString(1);
t2 = rs.getString(2);
//infoshow.append(n2 + ":" + t2 + "\n");
}
}
else{
ResultSet rs = st.executeQuery("SELECT * FROM [Sheet1$]");
ResultSetMetaData rsmd = rs.getMetaData();
int numberOfColumns = rsmd.getColumnCount();
while (rs.next()) {
for (int i = 1; i <= numberOfColumns; i++) {
if (i >= 1)
infoshow.append("\n");
String columnValue = rs.getString(i);
infoshow.append(columnValue);
}
System.out.println("");
}
}
st.close();
con.close();
}catch(Exception e){
e.printStackTrace();
}
}
private void jTextField1KeyTyped(KeyEvent evt) throws SQLException {
if (evt.getKeyChar()==KeyEvent.VK_ENTER) {
infoshow.append(n1 + ":" + t1 + "\n");
}
}
}
private void jTextField2KeyTyped(KeyEvent evt) throws SQLException {
if (evt.getKeyChar()==KeyEvent.VK_ENTER) {
infoshow.append(n2 + ":" + t2 + "\n");
}
}
}
}
为什么我在文本框中输入合法字符之后，按回车显示结果却是null，null？是dm和hm没取到值还是n1和t1没取到值？真心求教！！ --------------------编程问答-------------------- 前辈们都在哪啊，支援支援小弟啊 --------------------编程问答-------------------- 前辈们都在哪啊，支援支援小弟啊 --------------------编程问答-------------------- 具体问题，具体分析嘛.. --------------------编程问答-------------------- 我就是想让JTextField中的输入值赋予变量，加上按键易做图，以实现数据库查询
补充：Java , Eclipse
