请给出下面程序的输出结果。 class Bus { int num; String color; void run() { int num = 10; System.out.println(num + "___" + color); } } public class MemVarDemo { public static void main(String[] args) { memberDemo(); } private static void memberDemo() { Bus b = new Bus(); b.num = 4; b.color = "red"; b.run(); } }