-
java.math.BigDecimal。BigDecimal一共有4个够造方法，让我先来看看其中的两种用法：
第一种：BigDecimal(double val)
Translates a double into a BigDecimal.第二种：BigDecimal(String val)
Translates the String repre sentation of a BigDecimal into a BigDecimal.使用BigDecimal要用String来够造，要做一个加法运算，需要先将两个浮点数转为String，然后够造成BigDecimal，在其中一个上调用add方法，传入另一个作为参数，然后把运算的结果（BigDecimal）再转换为浮点数。
public static double add(double v1,double v2)
public static double sub(double v1,double v2)
public static double mul(double v1,double v2)
public static double div(double v1,double v2)
public static double div(double v1,double v2,int scale)
public static double round(double v,int scale)import java.math.BigDecimal;
/**
* 由于Java的简单类型不能够精确的对浮点数进行运算，这个工具类提供精
* 确的浮点数运算，包括加减乘除和四舍五入。
*/
public class Arith{ //默认除法运算精度
private static final int DEF_DIV_SCALE = 10; //这个类不能实例化
private Arith(){
}
/**
* 提供精确的加法运算。
* @param v1 被加数
* @param v2 加数
* @return 两个参数的和
*/
public static double add(double v1,double v2){
BigDecimal b1 = new BigDecimal(Double.toString(v1));
BigDecimal b2 = new BigDecimal(Double.toString(v2));
return b1.add(b2).doubleValue();
}
/**
* 提供精确的减法运算。
* @param v1 被减数
* @param v2 减数
* @return 两个参数的差
*/
public static double sub(double v1,double v2){
BigDecimal b1 = new BigDecimal(Double.toString(v1));
BigDecimal b2 = new BigDecimal(Double.toString(v2));
return b1.subtract(b2).doubleValue();
}
/**
* 提供精确的乘法运算。
* @param v1 被乘数
* @param v2 乘数
* @return 两个参数的积
*/
public static double mul(double v1,double v2){
BigDecimal b1 = new BigDecimal(Double.toString(v1));
BigDecimal b2 = new BigDecimal(Double.toString(v2));
return b1.multiply(b2).doubleValue();
}
/**
* 提供（相对）精确的除法运算，当发生除不尽的情况时，精确到
* 小数点以后10位，以后的数字四舍五入。
* @param v1 被除数
* @param v2 除数
* @return 两个参数的商
*/
public static double div(double v1,double v2){
return div(v1,v2,DEF_DIV_SCALE);
}
/**
* 提供（相对）精确的除法运算。当发生除不尽的情况时，由scale参数指
* 定精度，以后的数字四舍五入。
* @param v1 被除数
* @param v2 除数
* @param scale 表示表示需要精确到小数点以后几位。
* @return 两个参数的商
*/
public static double div(double v1,double v2,int scale){
if(scale<0){
throw new IllegalArgumentException(
"The scale must be a positive integer or zero");
}
BigDecimal b1 = new BigDecimal(Double.toString(v1));
BigDecimal b2 = new BigDecimal(Double.toString(v2));
return b1.divide(b2,scale,BigDecimal.ROUND_HALF_UP).doubleValue();
}
/**
* 提供精确的小数位四舍五入处理。
* @param v 需要四舍五入的数字
* @param scale 小数点后保留几位
* @return 四舍五入后的结果
*/
public static double round(double v,int scale){
if(scale<0){
throw new IllegalArgumentException("The scale must be a positive integer or zero");
}
BigDecimal b = new BigDecimal(Double.toString(v));
BigDecimal one = new BigDecimal("1");
return b.divide(one,scale,BigDecimal.ROUND_HALF_UP).doubleValue();
}
};
<p>java.math.BigDecimal。BigDecimal一共有4个够造方法，让我先来看看其中的两种用法：</p>
<p>第一种：BigDecimal(double val)<br>
Translates a double into a BigDecimal. </p>
<p>第二种：BigDecimal(String val)<br>
Translates the String repre sentation of a BigDecimal into a BigDecimal. </p>
<p>使用BigDecimal要用String来够造，要做一个加法运算，需要先将两个浮点数转为String，然后够造成BigDecimal，在其中一个上调用add方法，传入另一个作为参数，然后把运算的结果（BigDecimal）再转换为浮点数。</p>
<p><br>
public static double add(double v1,double v2)<br>
public static double sub(double v1,double v2)<br>
public static double mul(double v1,double v2)<br>
public static double div(double v1,double v2)<br>
public static double div(double v1,double v2,int scale)<br>
public static double round(double v,int scale)</p>
<p> </p>
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<ol class="">
dp-j<li><span><span class="">import</keywordspan><span> java.math.BigDecimal; </span></span></li><li><span></span><span class="">/** </commentspan> </li><li><span><span class="">*comment 由于Java的简单类型不能够精确的对浮点数进行运算，这个工具类提供精 </span> </span></li><li><span><span class="">*comment 确的浮点数运算，包括加减乘除和四舍五入。 </span> </span></li><li><span><span class="">*/</commentspan><span> </span></span></li><li><span></span><span class="">public</keywordspan><span> </span><span class="">class</keywordspan><span> Arith{ </span><span class="">//默认除法运算精度
comment</span><span> </span></li><li><span></span><span class="">private</keywordspan><span> </span><span class="">static</keywordspan><span> </span><span class="">final</keywordspan><span> </span><span class="">int</keywordspan><span> DEF_DIV_SCALE = </span><span class="">10</numberspan><span>; </span><span class="">//这个类不能实例化
comment</span><span> </span></li><li><span></span><span class="">private</keywordspan><span> Arith(){ </span></li><li><span>} </span></li><li><span></span><span class="">/** </commentspan> </li><li><span><span class="">*comment 提供精确的加法运算。 </span> </span></li><li><span><span class="">*comment @param v1 被加数 </span> </span></li><li><span><span class="">*comment @param v2 加数 </span> </span></li><li><span><span class="">*comment @return 两个参数的和 </span> </span></li><li><span><span class="">*/</commentspan><span> </span></span></li><li><span></span><span class="">public</keywordspan><span> </span><span class="">static</keywordspan><span> </span><span class="">double</keywordspan><span> add(</span><span class="">double</keywordspan><span> v1,</span><span class="">double</keywordspan><span> v2){
</span></li><li><span>BigDecimal b1 = </span><span class="">new</keywordspan><span> BigDecimal(Double.toString(v1)); </span></li><li><span>BigDecimal b2 = </span><span class="">new</keywordspan><span> BigDecimal(Double.toString(v2)); </span></li><li><span></span><span class="">return</keywordspan><span> b1.add(b2).doubleValue(); </span></li><li><span>} </span></li><li><span></span><span class="">/** </commentspan> </li><li><span><span class="">*comment 提供精确的减法运算。 </span> </span></li><li><span><span class="">*comment @param v1 被减数 </span> </span></li><li><span><span class="">*comment @param v2 减数 </span> </span></li><li><span><span class="">*comment @return 两个参数的差 </span> </span></li><li><span><span class="">*/</commentspan><span> </span></span></li><li><span></span><span class="">public</keywordspan><span> </span><span class="">static</keywordspan><span> </span><span class="">double</keywordspan><span> sub(</span><span class="">double</keywordspan><span> v1,</span><span class="">double</keywordspan><span> v2){
</span></li><li><span>BigDecimal b1 = </span><span class="">new</keywordspan><span> BigDecimal(Double.toString(v1)); </span></li><li><span>BigDecimal b2 = </span><span class="">new</keywordspan><span> BigDecimal(Double.toString(v2)); </span></li><li><span></span><span class="">return</keywordspan><span> b1.subtract(b2).doubleValue(); </span></li><li><span>} </span></li><li><span></span><span class="">/** </commentspan> </li><li><span><span class="">*comment 提供精确的乘法运算。 </span> </span></li><li><span><span class="">*comment @param v1 被乘数 </span> </span></li><li><span><span class="">*comment @param v2 乘数 </span> </span></li><li><span><span class="">*comment @return 两个参数的积 </span> </span></li><li><span><span class="">*/</commentspan><span> </span></span></li><li><span></span><span class="">public</keywordspan><span> </span><span class="">static</keywordspan><span> </span><span class="">double</keywordspan><span> mul(</span><span class="">double</keywordspan><span> v1,</span><span class="">double</keywordspan><span> v2){
</span></li><li><span>BigDecimal b1 = </span><span class="">new</keywordspan><span> BigDecimal(Double.toString(v1)); </span></li><li><span>BigDecimal b2 = </span><span class="">new</keywordspan><span> BigDecimal(Double.toString(v2)); </span></li><li><span></span><span class="">return</keywordspan><span> b1.multiply(b2).doubleValue(); </span></li><li><span>} </span></li><li><span></span><span class="">/** </commentspan> </li><li><span><span class="">*comment 提供（相对）精确的除法运算，当发生除不尽的情况时，精确到 </span> </span></li><li><span><span class="">*comment 小数点以后10位，以后的数字四舍五入。 </span> </span></li><li><span><span class="">*comment @param v1 被除数 </span> </span></li><li><span><span class="">*comment @param v2 除数 </span> </span></li><li><span><span class="">*comment @return 两个参数的商 </span> </span></li><li><span><span class="">*/</commentspan><span> </span></span></li><li><span></span><span class="">public</keywordspan><span> </span><span class="">static</keywordspan><span> </span><span class="">double</keywordspan><span> div(</span><span class="">double</keywordspan><span> v1,</span><span class="">double</keywordspan><span> v2){
</span></li><li><span></span><span class="">return</keywordspan><span> div(v1,v2,DEF_DIV_SCALE); </span></li><li><span>} </span></li><li><span></span><span class="">/** </commentspan> </li><li><span><span class="">*comment 提供（相对）精确的除法运算。当发生除不尽的情况时，由scale参数指 </span> </span></li><li><span><span class="">*comment 定精度，以后的数字四舍五入。 </span> </span></li><li><span><span class="">*comment @param v1 被除数 </span> </span></li><li><span><span class="">*comment @param v2 除数 </span> </span></li><li><span><span class="">*comment @param scale 表示表示需要精确到小数点以后几位。 </span> </span></li><li><span><span class="">*comment @return 两个参数的商 </span> </span></li><li><span><span class="">*/</commentspan><span> </span></span></li><li><span></span><span class="">public</keywordspan><span> </span><span class="">static</keywordspan><span> </span><span class="">double</keywordspan><span> div(</span><span class="">double</keywordspan><span> v1,</span><span class="">double</keywordspan><span> v2,</span><span class="">int</keywordspan><span> scale){
</span></li><li><span></span><span class="">if</keywordspan><span>(scale<</span><span class="">0</numberspan><span>){ </span></li><li><span></span><span class="">throw</keywordspan><span> </span><span class="">new</keywordspan><span> IllegalArgumentException( </span></li><li><span></span><span class="">string"The scale must be a positive integer or zero"</span><span>); </span></li><li><span>} </span></li><li><span>BigDecimal b1 = </span><span class="">new</keywordspan><span> BigDecimal(Double.toString(v1)); </span></li><li><span>BigDecimal b2 = </span><span class="">new</keywordspan><span> BigDecimal(Double.toString(v2)); </span></li><li><span></span><span class="">return</keywordspan><span> b1.divide(b2,scale,BigDecimal.ROUND_HALF_UP).doubleValue(); </span></li><li><span>} </span></li><li><span></span><span class="">/** </commentspan> </li><li><span><span class="">*comment 提供精确的小数位四舍五入处理。 </span> </span></li><li><span><span class="">*comment @param v 需要四舍五入的数字 </span> </span></li><li><span><span class="">*comment @param scale 小数点后保留几位 </span> </span></li><li><span><span class="">*comment @return 四舍五入后的结果 </span> </span></li><li><span><span class="">*/</commentspan><span> </span></span></li><li><span></span><span class="">public</keywordspan><span> </span><span class="">static</keywordspan><span> </span><span class="">double</keywordspan><span> round(</span><span class="">double</keywordspan><span> v,</span><span class="">int</keywordspan><span> scale){
</span></li><li><span></span><span class="">if</keywordspan><span>(scale<</span><span class="">0</numberspan><span>){ </span></li><li><span></span><span class="">throw</keywordspan><span> </span><span class="">new</keywordspan><span> IllegalArgumentException(</span><span class="">string"The scale must be a positive integer or zero"</span><span>); </span></li><li><span>} </span></li><li><span>BigDecimal b = </span><span class="">new</keywordspan><span> BigDecimal(Double.toString(v)); </span></li><li><span>BigDecimal one = </span><span class="">new</keywordspan><span> BigDecimal(</span><span class="">string"1"</span><span>); </span></li><li><span></span><span class="">return</keywordspan><span> b.divide(one,scale,BigDecimal.ROUND_HALF_UP).doubleValue(); </span></li><li><span>} </span></li><li><span>}; </span></li></ol>
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<p><a href="">java获取新浪天气预报代码<//huiwenjie168/article/details/27332779a></p>
<p><a href="" /huiwenjie168class="">huiwenjie168</reply_namea><span>回复：</span></p>
<p class=""><reply_cem></em><i>@qq_35476379:你能那到天气情况，图片还不好设置吗？http://www.17sucai....</i></p>
</li> <li>
<p><a href="">java获取新浪天气预报代码</a></p>
<p><a href="" /qq_35476379class="">qq_35476379</reply_namea><span>回复：</span></p>
<p class=""><reply_cem></em><i>有个问题请教下，我看返回的数据中没有天气对应图片的数据哦，新浪天气获取不到天气图片的吗？</i></p>
</li> <li>
<p><a href="">org.hibernate.exception.SQLGrammarException: could not execute query处理方式<//huiwenjie168/article/details/7017680a></p>
<p><a href="" /yiwangxiblogclass="">yiwangxiblog</reply_namea><span>回复：</span></p>
<p class=""><reply_cem></em><i>感谢分享</i></p>
</li> <li>
<p><a href="">java.lang.IllegalArgumentException: node to traverse cannot be null! 处理方法<//huiwenjie168/article/details/7019276a></p>
<p><a href="" /wangjinlong_class="">wangjinlong_</reply_namea><span>回复：</span></p>
<p class=""><reply_cem></em><i>解决了，</i></p>
</li> <li>
<p><a href="">用iText给pdf添加水印图片<//huiwenjie168/article/details/7616983a></p>
<p><a href="" /u014335844class="">u014335844</reply_namea><span>回复：</span></p>
<p class=""><reply_cem></em><i>图片本身有要求吗，格式方面</i></p>
</li> <li>
<p><a href="">spring+mybatis使用MapperScannerConfigurer引起的PropertyPlaceholderConfigurer无效问题处理方法<//huiwenjie168/article/details/51722290a></p>
<p><a href="" /a769901686class="">a769901686</reply_namea><span>回复：</span></p>
<p class=""><reply_cem></em><i>我也试了，不行，也看不出来，上面两个的配置除了改了SqlSessionFactoryBean的id名...</i></p>
</li> <li>
<p><a href="">spring加载hibernate映射文件的几种方式<//huiwenjie168/article/details/7013618a></p>
<p><a href="" /foaicaiqingclass="">foaicaiqing</reply_namea><span>回复：</span></p>
<p class=""><reply_cem></em><i>大神，谢谢了</i></p>
</li> <li>
<p><a href="">免装版tomcat注册成windows系统服务方法<//huiwenjie168/article/details/42267353a></p>
<p><a href="" /xiaoqingwa0214class="">xiaoqingwa0214</reply_namea><span>回复：</span></p>
<p class=""><reply_cem></em><i>很有帮助</i></p>
</li> <li>
<p><a href="">BigDecimal加减乘除运算<//huiwenjie168/article/details/6998140a></p>
<p><a href="" /qq_18843045class="">qq_18843045</reply_namea><span>回复：</span></p>
<p class=""><reply_cem></em><i>double处理是有问题的，2245.325试着保留2位小数位看看</i></p>
</li> <li>
<p><a href="">java根据IP获取用户所在地<//huiwenjie168/article/details/16898619a></p>
<p><a href="" /wanggangjiaclass="">wanggangjia</reply_namea><span>回复：</span></p>
<p class=""><reply_cem></em><i>挺不错 正如楼上所说 ip要用外网的才行</i></p>
</li> </ul>
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