阅读以下程序 import java.io.* ; public class Test { public static void main(String args[]) { SubSubClass m=new SubSubClass(3,6,6); m.show(); } } class SuperClass { int a,b; SuperClass(int x,int y){ a=x; b=y; } } class SubClass extends SuperClass { int c; SubClass(int aa,int bb,int cc) { super(aa,bb); c = cc; } } class SubSubClass extends SubClass { int a ; SubSubClass(int aa,int bb,int cc) { super(aa,bb,cc); a = aa + bb + cc; } void show() { System.out.println("a="+ a +"\nb="+ b +"\nc="+ c); } } 写出运行结果: a=__ b=__ c=__