【单选题】现有: class Top { static int x=l; public Top (inty) { x*=3; } } class Middle extends Top { public Middle() {x+=1; ) public static void main (String [] args) { Middle m = ne...
【单选题】现有代码如下 1 . class Top { 2. static int x = 1 ; 3 . public Top() { x*=3; } 4 . } 5. class Middle extends Top { 6. public Middle() {x+=l; } 7. public static void main(String [] arg...