Java允许跨域重载

class Base {void fun(int num){System.out.println("fun(int num)"+num);}}public class Derived extends Base{void fun(double num){System.out.println("fun(double num)"+num);}public static void main(String[] args) {Base a=new Derived();int num=1;double dnum=1.5;a.fun( num);//a.fun( dnum);//无法将 Base 中的 fun(int) 应用于 (double)Derived D=new Derived();D.fun( num);D.fun( dnum);}}/*fun(int num)1fun(int num)1fun(double num)1.5请按任意键继续. . .*/