关于java的数学运算
import java.math.BigDecimal;public class MathTool {/* * 加法运算 */public static String jia(double d1,double d2){BigDecimal b1 = new BigDecimal(d1+"");BigDecimal b2 = new BigDecimal(d2+"");return b1.add(b2).toPlainString();}/* * 减法运算 */public static String jian(double d1,double d2){BigDecimal b1 = new BigDecimal(d1+"");BigDecimal b2 = new BigDecimal(d2+"");return b1.subtract(b2).toPlainString();}/* * 乘法运算 */public static String cheng(double d1,double d2){BigDecimal b1 = new BigDecimal(d1+"");BigDecimal b2 = new BigDecimal(d2+"");return b1.multiply(b2).toPlainString();}/* * 除法运算 */public static String chu(double d1,double d2,int point){BigDecimal b1 = new BigDecimal(d1+"");BigDecimal b2 = new BigDecimal(d2+"");return b1.divide(b2,point,BigDecimal.ROUND_HALF_UP).toPlainString();}public static void main(String[] args) {double double_a = 0.05d;double double_b = 0.01d;System.out.println(MathTool.jia(double_a, double_b));//0.06System.out.println(MathTool.jian(double_a, double_b));//0.04System.out.println(MathTool.cheng(double_a, double_b));//0.0005System.out.println(MathTool.chu(double_a, double_b,0));//5}}??
????? 做加减乘数等数学运算时，应尽可能使用BigDecimal类，切忌直接使用int、float、double进行直接运算，否则很有可能会发生精度的丢失，进而导致计算结果的不准确。
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