java - 我的java没有错误，但没有运行

Question

很难说出这里问的是什么。这个问题是含糊的、模糊的、不完整的、过于宽泛的或修辞性的，无法以目前的形式得到合理的回答。如需帮助澄清此问题以便重新打开它， visit the help center 。

已关闭 10 年前。

我对这种java语言很陌生，所以我仍然很难弄清楚事情，虽然我没有错误，但仍然无法运行。帮我解决这个问题。我发布了与此相同的程序，尽管问题很久以前我就已经弄清楚了。

public Connection dbConnection() throws Exception
{
    Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
    String filename =
        "C:/Documents and Settings/gebs/Desktop/Database1.mdb";// fileplace
    String database =
        "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ=";// connection driver
    database += filename.trim() + ";DriverID=22;READONLY=true}";
    return DriverManager.getConnection(database, "", "");

    try
    {
        Connection con = dbConnection();

        String lname = this.jTextField1.getText();
        String fname = this.jTextField2.getText();
        String mname = this.jTextField3.getText();
        String address = this.jTextField4.getText();
        String birthday =
            (String) this.jComboBox1.getSelectedItem()
                + this.jTextField5.getText() + this.jTextField6.getText();
        String gender = (String) this.jComboBox2.getSelectedItem();
        String age = this.jTextField7.getText();
        String contactno = this.jTextField8.getText();
        String contactperson = this.jTextField9.getText();
        String department = this.jTextField11.getText();
        String position = this.jTextField12.getText();

        // to insert to database
        String query =
            "INSERT INTO Personal_Category "
                + "(Last_Name,First_Name,Middle_Initial,Address, "
                + "Birthday,Gender,Age,Contact_No,Contact_Person,"
                + "Department,Position) "
                + "VALUES (?,?,?,?,?,?,?,?,?,?,?,)";

        PreparedStatement pre;
        pre = con.prepareStatement(query);
        pre.setString(1, lname);
        pre.setString(2, fname);
        pre.setString(3, mname);
        pre.setString(4, address);
        pre.setString(5, birthday);
        pre.setString(6, gender);
        pre.setString(7, age);
        pre.setString(8, contactno);
        pre.setString(9, contactperson);
        pre.setString(10, department);
        pre.setString(11, position);
        pre.execute();// execute
        con.close();
    }
    catch (Exception e)
    {
        System.out.println(e);
    }
}

Answer 1

问题出在你的return语句上:

return DriverManager.getConnection(database, "", "");

此行之后的任何内容都无法到达，因为该方法此时终止(即返回)。所以编译器会提示。