import com.intellij.openapi.fileEditor.ex.FileEditorManagerEx;
import java.lang.reflect.Method;

public class CheckAPI {
    public static void main(String[] args) {
        try {
            Class<?> clazz = FileEditorManagerEx.class;
            System.out.println("Methods in FileEditorManagerEx:");
            for (Method m : clazz.getMethods()) {
                if (m.getName().toLowerCase().contains("open")) {
                    System.out.println(m.getName() + " -> " + m.getParameterCount() + " params");
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}