[英]pass a method from one class to another class in java swing
i Have a method of ClassA which is following 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);
}
Now i have a class B 现在我有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("")
}
I tried several things but fails to do what i want to do. 我尝试了几件事,但没有做我想做的事。
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("")
}
you can make a instance of class A and just call the method like this a.add(); 您可以创建类A的实例,然后像这样调用方法a.add(); but class A will have to be static.
但是A类必须是静态的。 You should try to use a constructor to pass rs to class B.
您应该尝试使用构造函数将rs传递给B类。
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