Question

我试图使用这个静态方法覆盖我的JComboBox getSelectedItem方法：

public static void setupID_TITLE_ComboBox(JComboBox jComboBox, String tableName) throws SQLException {
    // query to select ID and TITLE from profiles table
    String query = "SELECT ID,TITRE FROM " + tableName + ";";
    ResultSet myJComboResultSet = SQLTools.ExecuteQuery(query);

    ArrayList visualItems = new ArrayList(); // the Items of my combobox  [item1,item2]
    ArrayList idItems = new ArrayList(); // the corresponding IDs for each item [id1,id2]

    while (myJComboResultSet.next()) {
        visualItems.add(myJComboResultSet.getObject("TITRE")); // filling items set
        idItems.add(myJComboResultSet.getObject("ID")); // filling IDs set
    }

    System.out.println("IDItems=" + idItems); // checking that my Items are filled
    System.out.println("visualItems=" + visualItems); // checking that my IDs are filled

// creating a combobox of previous items
    jComboBox = new JComboBox(visualItems.toArray()) {
        ArrayList values = idItems;

// overriding the getSelectedItem to return the corresponding selected item's ID
        @Override
        public Object getSelectedItem() {
            Object get = values.get(super.getSelectedIndex());
            System.out.println("get = " + get);
            return get; 
        }

    };

}

我从另一个框架调用此方法：

   JComboBoxTools.setupID_TITLE_ComboBox(J_Users_Profile,"profiles");

但是在执行时它不起作用。输出：

visualItems = [管理员，教师，学生]

IDItems = [0,3,5]

所选项目的返回值为：教师

不知道该怎么办我希望它返回3，这是教师的身份。

完整项目位于：this link

谢谢。

Answer 1

我使用mapComboBoxModel获取所需的值

public static void setupID_TITLE_ComboBox(JComboBox jComboBox, String tableName) throws SQLException {

    String query = "SELECT ID,TITRE FROM " + tableName + ";";
    ResultSet myJComboResultSet = SQLTools.ExecuteQuery(query);

    HashMap myMap = new HashMap();
    while (myJComboResultSet.next()) {  
        myMap.put(myJComboResultSet.getObject("TITRE"), myJComboResultSet.getObject("ID"));
    }

    jComboBox.setModel(new MapComboBoxModel(myMap) {

        @Override
        public Object getValue(Object selectedItem) {
            return map_data.get(selectedItem); //To change body of generated methods, choose Tools | Templates.
        }

    });


}

我重写了getValue以返回ID。

if (myComponent instanceof JComboBox) {
            JComboBox jComboBox = (JComboBox) myComponent;
             MapComboBoxModel model = (MapComboBoxModel) jComboBox.getModel();
             values+=""+model.getValue(model.getSelectedItem())+",";                
        }

重写JComboBox getSelectedItem不起作用

1 个答案: