You can do that quite easily in fact.
package WriteMessage.*;
Code:
public class WriteMessage{
public void writeUM(int line, String Message) {
//lots of code
}
}
In your main robot code file:
Code:
import edu.wpi.first.wpilibj.*;
import WriteMessage.*;
public class RobotFile{
///when you want to access you method
WriteMessage.writeUM(5,"Hello World");
}
NetBeans does a really good job of helping you out on this type of stuff.