在由查询填充的jcombobox中设置默认值

Question

我目前正在使用查询填充jcombobox的Java编写程序。我想知道在程序执行时是否有一种方法来获得默认的选定值。我的查询是按字母顺序列出的语言列表，但我很好奇，如果可以将英语（位于列表中间）作为默认值。

我知道，当你手动硬编码值到JComboBox中你可以设置默认的变量

jcombobox.setSelectedIndex(int anIndex); 

或

jcombobox.setSelectedItem(Object anObject); 

，但我不确定当一个ResultSet循环和填充JComboBox中。

目前我的代码是：

languageLabel =new JLabel("Languages:"); 
rowFour.add(languageLabel,BorderLayout.WEST);//adding to my current panel 
langbox = new JComboBox(); 
rowFour.add(langbox,BorderLayout.WEST); 
try 
{ 
    con = DriverManager.getConnection ("jdbc:oracle:thin:@localHost:portNumber:ORCL", "username", "password"); 
    statement = con.createStatement(); 
} 
catch(SQLException sqle) 
      { 
      System.out.println(sqle);  
      } 
langbox.removeAllItems(); 
langbox.addItem("Please Select..."); 
try 
    { 
     ResultSet rs = statement.executeQuery("select language from language order by 1"); 
     while (rs.next()) 
      { 
       langbox.addItem(rs.getString(1)); 
       //Thinking that this is where a default value would be located 
      } 

    } 
catch(Exception e) 
    { 
    System.err.println(e); 
    } 

谢谢您的时间。

Answer 1

ResultSet rs = statement.executeQuery("select language from language order by 1"); 
while (rs.next()) { 
    langbox.addItem(rs.getString(1)); 
    //I'm thinking that this is where a default value would be located 
    if(rs.getString(1).equals(myDefaultLanguageVariable)) { 
     langbox.setSelectedItem(rs.getString(1)); 
    } 
} 

btw：你应该清理那个代码，它不是那么好。