How to get a Java method's all referring classes by jars like ASM or Javassist?

As the code shows below:

public class Main implements MainInter{
    public static void main(String[] args) {
        List<String> s = new ArrayList<>();
        DClassFather var = new DClassFather();
        DClassFather d = new DClass();
    }
}

How can I get that the method "Main: main" refers classes "java.lang.String", "java.util.ArrayList", "java.util.List", "DClassFather", "DClass"