How to get all the methods a class is using

I need to find a way to find all the methods a class is using (pay attention, not the methods declared in it). EX:

public class Bondia{
    public static void main(String[] args){
    System.out.println("oi");
    System.out.println(new Random().nextInt(10));
    }
}

In this class, for example, I need to list the methods:

• System.out.println();
• java.util.Random.nextInt();
• and preferably the constructor as well ( new java.util.Random() );

Does anyone know a way to do this?