转：https://zhidao.baidu.com/question/425121188966899652.html
import
java.math.BigDecimal;
/*
* 构造方法:
* public BigDecimal(String val):
*
* 金融相关的东西(例:银行钱的小数,商品价格小数,实验小数)
*
* 成员方法:
* public BigDecimal add(BigDecimal augend):加
* public BigDecimal subtract(BigDecimal subtrahend):减
* public BigDecimal multiply(BigDecimal multiplicand):乘
* public BigDecimal divide(BigDecimal divisor):除
* public BigDecimal divide(BigDecimal divisor,int scale,int roundingMode):商,几位小数,如何舍取。
*
*/
public
class
BigDecimalDemo {
public
static
void
main(String[] args) {
System.out.println(
0.09
+
0.01
);
System.out.println(
1.0
-
0.32
);
System.out.println(
1.015
*
100
);
System.out.println(
1.301
/
100
);
// public BigDecimal add(BigDecimal augend):加
BigDecimal bd1 =
new
BigDecimal(
"0.09"
);
BigDecimal bd2 =
new
BigDecimal(
"0.01"
);
System.out.println(
"add:"
+ bd1.add(bd2));
System.out.println(
"----------------------"
);
// public BigDecimal subtract(BigDecimal subtrahend):减
BigDecimal bd3 =
new
BigDecimal(
"1.0"
);
BigDecimal bd4 =
new
BigDecimal(
"0.32"
);
System.out.println(
"subtract:"
+ bd3.subtract(bd4));
System.out.println(
"----------------------"
);
// public BigDecimal multiply(BigDecimal multiplicand):乘
BigDecimal bd5 =
new
BigDecimal(
"1.015"
);
BigDecimal bd6 =
new
BigDecimal(
"100"
);
System.out.println(
"multiply:"
+ bd5.multiply(bd6));
System.out.println(
"----------------------"
);
// public BigDecimal divide(BigDecimal divisor):除
BigDecimal bd7 =
new
BigDecimal(
"1.301"
);
BigDecimal bd8 =
new
BigDecimal(
"100"
);
System.out.println(
"divide:"
+ bd7.divide(bd8));
System.out.println(
"divide:"
+ bd7.divide(bd8,
3
,BigDecimal.ROUND_HALF_UP));
System.out.println(
"divide:"
+ bd7.divide(bd8,
9
,BigDecimal.ROUND_HALF_UP));
}
}
|