java的BigDecimal数据类型
//前提为a、b均不能为nullif(a.compareTo(b) == -1){ System.out.println("a小于b"); }if(a.compareTo(b) == 0){ System.out.println("a等于b"); }if(a.compareTo(b) == 1){ System.out.println("a大于b"); }if(a.compareTo(b) > -1){ System.ou
