来源：深圳沃龙软件开发公司 2021-04-23
一、BigDecimal 比较大小
if(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.out.println("a大于等于b");
}
if(a.compareTo(b) < 1){
System.out.println("a小于等于b");
}
二、BigDecimal 的加减乘除运算
BigDecimal b1 = new BigDecimal("10");
BigDecimal b2 = new BigDecimal("5");
BigDecimal b3 = null;
//加法
b3 = b1.add(b2);
System.out.println("和 是：" + b3);
//减法
b3 = b1.subtract(b2);
System.out.println("差 是：" + b3);
//乘法
b3 = b1.multiply(b2);
System.out.println("积 是：" + b3);
//除法
b3 = b1.divide(b2);
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