问题现象
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7vBg+x2lGr8FjXQF4Kw4ODgfLD1u15wwXj+fL9iv6xk/YYyUrPL/ZzTjluINjzHyl4IcPr57SvhmSfBrw75cIdAPapW8UpX+qaBqrvUe7UdeEB57WXdAerh+8LaExJe7x9kgk8mlvS6SVKkhuyKJlmg/r4v5ItmQaCkwcEpxNWpx76mASvFMSOGxD3YoGRM8p3K5RHEZoTEr9lPi+vLzYQkAY05PbrRsxrVkmxlr6BwJBD9Xp55OwF9ovdl/gvrkeO16uD9DMjVZlZyAox7sUCqx+ioF5nySoNuDPsBlsvd4C3Ot9+8jqTSrxHOdFEme538SWdMWtRU+E2oKT3SwHlqXlbs6Q7CDE8t3FjSibfoEH+Ybmtlwb8AwMtgckBPxcz1i/BuAF17kJ7LMLllUbzf7PvjYIXF2pAGmhRRqOyW456jV+yafKCdcjBUdm5W1YpX77ymK/d8vITET/YGm3ZpAHzyDI9NjOeO+ZbgPLF/sg7CQPjCpUC6pyGUb07Vn+GM27AHFVgrVH9RxGKdwea/wflfjEidw3GjhiNrfPNovzgOdkwIFvXOYWT71Fvzkp7R/nnbQwXDsuWfeYM9oFfO0xe0ji/nG0XdTHnLslXNsuZ2VC3RBYl52V2XjqU5blekj0D5u9Bbzwkxb0tU9L6SG/1b83T90vfUfPHmS5N+U7iMyqZdIMmEOjMCxxzrC9dV3ExN+424BeNP/P4zs/JxRrG+lUYJFh5euPFIA20IHeAfbn/uTi2/dDAqYmUQ+vdA/3GPvNE5xbjRGLKvCXpijUY+PRzsjF5RK89DQS72e0765qUBso9ATHXC6zji6hXJZxTfPuIo3wU5vPTo8WjvRs73KK+6OAPQ/ZmLSxitES183jnDjTrF283dMqlY3Lisjmc++TPzR84Tl2nOzNPecxBmj3KPBc8Jjv7ZF2nyIxMTMj5krlsR84GLzAnL2lPdbBxl/RZ6eTyuBy37gzcckjG9vp+ejiTktbqX94sW3utdZ+U02fNqzMbd8uJJ/wTQje3pHXH6Z7LsrVPcivlnZKcHpffzJrN9k9HZUsu85IpNmj1fd6a/XOq4sjlRPOGVZF9GlgaSAMtxjm/jBoWEPNf0ebl1KB853D5fiRTzjy3e2SvpGtV69M3UNaUNGA33uU5lIJL7p9x2X+IKd/X4K1dxekII9OAXfnU1vGe/EShxlOZBL36p/fJw8oWvyMvTx0t/1Bv2jof75EHrZP+y/ZIujR7lHM6qDxzz275TiFiYZKXlEuyfrPVCLnWbpYHB+WB7oaUnJX7euTpUvmJjnXyjYI81Cc3t1RJkTP3ypeOKX8bAfF+GdobMcVIFiVTbNAq/BOWWPzfXH/HXo1IAzbSQAtxzqTjOgCcboN04+nm5mR+Rl4Tub3TuSko/aLVlgaClL5033y9jRxF6P8kA/ztdLVZEFTOVgu+xFpm8fUKhPse6mxe5mbklXm5PefcgbYYxs5j3x4WeDLRHmXds/fatLR3ya3tcnPM2yQvab37XEnm2mVNZ5UVzKLku3Pyrrvu7e2tW/L6vFn4lZKsWWeWXNHYkqk2aDR7KG5EX1qgx7HWbF1GGrCRBlpH1Z/2cctVOuFempo7irDuaxPqGxjtyg9MB9v+xc9SDCxfmSdmH9KAjTQAANAXacBGGgAA6Is0YCMNAAD0RRqwkQYAAPoiDdhIAwAAfZEGbKQBAIC+SAM20gAAQF+kARtpAACgL9KAjTQAANAXacBGGgAA6Is0YCMNAAD0RRqwkQYAAPoiDdhIAwAAfZEGbG3vvfdes5cBAAA00/8DLE3zgHKPsscAAAAASUVORK5CYII=)]
解决办法
1.使用BigDecimal来进行运算
Java在java.math包中提供的API类BigDecimal，用来对超过16位有效位的数进行精确的运算。双精度浮点型变量double可以处理16位有效数，但在实际应用中，可能需要对更大或者更小的数进行运算和处理。一般情况下，对于那些不需要准确计算精度的数字，我们可以直接使用Float和Double处理，但是Double.valueOf(String) 和Float.valueOf(String)会丢失精度。所以开发中，如果我们需要精确计算的结果，则必须使用BigDecimal类来操作。
2.创建BigDecimal类型对象时将Double类型的数据转换为字符串
例如：
BigDecimal sum = new BigDecimal("0.0");
可以通过BigDecimal类的方法进行各种运算
sum = sum.add(new BigDecimal("12.1"));
-
add(BigDecimal)
BigDecimal对象中的值相加，返回BigDecimal对象
-
subtract(BigDecimal)
BigDecimal对象中的值相减，返回BigDecimal对象
-
multiply(BigDecimal)
BigDecimal对象中的值相乘，返回BigDecimal对象
-
divide(BigDecimal)
BigDecimal对象中的值相除，返回BigDecimal对象
-
toString()
将BigDecimal对象中的值转换成字符串
-
doubleValue()
将BigDecimal对象中的值转换成双精度数
-
floatValue()
将BigDecimal对象中的值转换成单精度数
-
longValue()
将BigDecimal对象中的值转换成长整数
-
intValue()
将BigDecimal对象中的值转换成整数