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方法的声明：
public BigDecimal divide(BigDecimal divisor, int scale, int roundingMode)
参数解析：
divisor是除数，scale是精确度，roundingMode是结果的取值方式。
返回值：
返回的结果也是一个BigDecimal
测试案例：
同时解释一下roundingMode的五种模式
案例1
/**
* Rounding mode to round towards zero. Never increments the digit
* prior to a discarded fraction (i.e., truncates). Note that this
* rounding mode never increases the magnitude of the calculated value.
*/
public final static int ROUND_DOWN = 1;
![Java.math.BigDecimal.divide()方法[亲测有效]](https://img.mushiming.top/app/yundeesoft_com/78f93c02cca54b229bccf5ab5a2bbe1d.jpg "Java.math.BigDecimal.divide()方法[亲测有效]插图")
![Java.math.BigDecimal.divide()方法[亲测有效]](https://yundeesoft.com/wp-content/uploads/2022/11/2022112316405970.jpg "Java.math.BigDecimal.divide()方法[亲测有效]插图1")
案例2：
/**
* Rounding mode to round towards positive infinity. If the
* {@code BigDecimal} is positive, behaves as for
* {@code ROUND_UP}; if negative, behaves as for
* {@code ROUND_DOWN}. Note that this rounding mode never
* decreases the calculated value.
*/
public final static int ROUND_CEILING = 2;
![Java.math.BigDecimal.divide()方法[亲测有效]](https://img.mushiming.top/app/yundeesoft_com/ec732095c4684eeab9707450d70410ba.jpg "Java.math.BigDecimal.divide()方法[亲测有效]插图2")
案例3：
/**
* Rounding mode to round towards negative infinity. If the
* {@code BigDecimal} is positive, behave as for
* {@code ROUND_DOWN}; if negative, behave as for
* {@code ROUND_UP}. Note that this rounding mode never
* increases the calculated value.
*/
public final static int ROUND_FLOOR = 3;
![Java.math.BigDecimal.divide()方法[亲测有效]](https://img.mushiming.top/app/yundeesoft_com/123321e2a4ea44eab82da07e85cb4e6b.jpg "Java.math.BigDecimal.divide()方法[亲测有效]插图4")
案例4：
![Java.math.BigDecimal.divide()方法[亲测有效]](https://img.mushiming.top/app/yundeesoft_com/bbbca0d15f264b95baefe07e440be0af.jpg "Java.math.BigDecimal.divide()方法[亲测有效]插图6")
案例：
/**
* Rounding mode to round towards {@literal “nearest neighbor”}
* unless both neighbors are equidistant, in which case round
* down. Behaves as for {@code ROUND_UP} if the discarded
* fraction is {@literal >} 0.5; otherwise, behaves as for
* {@code ROUND_DOWN}.
*/
public final static int ROUND_HALF_DOWN = 5;
![Java.math.BigDecimal.divide()方法[亲测有效]](https://img.mushiming.top/app/yundeesoft_com/2f750717378a48389591e15ccad28c84.jpg "Java.math.BigDecimal.divide()方法[亲测有效]插图8")
补充其他方法：
BigDecimal.setScale()方法用于格式化小数点
setScale(1)表示保留一位小数，默认用四舍五入方式
setScale(1,BigDecimal.ROUND_DOWN)直接删除多余的小数位，如2.35会变成2.3
setScale(1,BigDecimal.ROUND_UP)进位处理，2.35变成2.4
setScale(1,BigDecimal.ROUND_HALF_UP)四舍五入，2.35变成2.4
setScaler(1,BigDecimal.ROUND_HALF_DOWN)四舍五入，2.35变成2.3，如果是5则向下舍
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