java整数相除怎么保留小数位

        Integer discount = 0;
        if(isVip){
             discount = configMapper.getValueByName("vip_discount");
        }else{
             discount = configMapper.getValueByName("free_discount");
        }
        System.out.println("discount"+discount);
        double userDiscount = discount/100;

Integer discount = 0; if(isVip){ discount = configMapper.getValueByName("vip_discount"); }else{ discount = configMapper.getValueByName("free_discount"); } System.out.println("discount"+discount); double userDiscount = discount/100;