How to call method using constructor - swing

Question

I am trying to retrieve data from database and display it using label in java swing. Here are my codes :
public void SetUpJTable() {
// Set Up Database Source
db.setUp("IT Innovation Project");
String sql = "Select topic_title,topic_description,topic_by from forumTopics WHERE topic_id = "
+ topicId + "";
ResultSet resultSet = null;
// Call readRequest to get the result
resultSet = db.readRequest(sql);
try {
while (resultSet.next()) {
jLabel_topicTitle.setText(resultSet.getString("topic_title"));
jLabel_content.setText(resultSet.getString("topic_description"));
jLabel_topicBy.setText(resultSet.getString("topic_by"));
}
resultSet.close();
} catch (Exception e) {
System.out.println(e);
}
}
And I used a constructor to call the method :
public eForumThreadContent(){
SetUpJTable();
};
However, when I run the app, the label is not showing anything. So how can I fix this? I have no idea how to call a method in a class which is without main method. Any guides? Thanks in advance.

Answer 1

To call method from other class:
public class Class1
{
public static void methodFromClass1()
{
// body...
}
}
public class Class2
{
Class1.methodFromClass1(); // thats the way you do it.
}
Ass you can see Class2 has no main class.. You can also call methodFromClass1() in Class1 the same way. But it's all in the manuals..