class Beverage { Beverage () { System.out.print ("beverage "); } } class Beer extends Beverage { public static void main(String [] args) { Beer b = new Beer (14) ; } public int Beer(int x) { this () ; System.out.print ("beerl") ; } pu...
jacean：把第一个构造函数的int去掉，构造函数不需要类型