在Java swing中將方法從一個類傳遞到另一個類

Question

我有下面的ClassA方法

public class ClassA{
public void add(){

 try {
            Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
            String url = "jdbc:oracle:thin:@localhost:1521:XE";
            conn = DriverManager.getConnection(url, "Hr", "Hr");
            System.out.println("Connection Established");

            Statement stmt = conn.createStatement();
            ResultSet rs = stmt.executeQuery(""); // in which class i pass this method i want to write the insert query  in the inverted commas


}} } 
            catch (Exception e) {

                System.err.println("connection error " + e);
        }

現在我有B班

public class ClassB{

//how can i get the add() method of classA in such a way that i can write my query direct into the  ResultSet rs = stmt.executeQuery("") 

}

我嘗試了幾件事，但沒有做我想做的事。

Answer 1

public class ClassB{
ClassA a = new ClassA();
//how can i get the add() method of classA in such a way that i can write my query direct into the  ResultSet rs = stmt.executeQuery("") 

}

您可以創建類A的實例，然后像這樣調用方法a.add（）; 但是A類必須是靜態的。 您應該嘗試使用構造函數將rs傳遞給B類。