import java.math.BigDecimal; public class Arith { private static final int DEF_DIV_SCALE = 10; /** * * 两个Double数相加 * * * @param v1 * * @param v2 * * @return Double */ public static Double add(Double v1, Double v2) { BigDecimal b1 = new BigDecimal(v1.toString()); BigDecimal b2 = new BigDecimal(v2.toString()); return new Double(b1.add(b2).doubleValue()); } /** * * 两个Double数相减 * * * @param v1 * * @param v2 * * @return Double */ public static Double sub(Double v1, Double v2) { BigDecimal b1 = new BigDecimal(v1.toString()); BigDecimal b2 = new BigDecimal(v2.toString()); return new Double(b1.subtract(b2).doubleValue()); } /** * * 两个Double数相乘 * * * @param v1 * * @param v2 * * @return Double */ public static Double mul(Double v1, Double v2) { BigDecimal b1 = new BigDecimal(v1.toString()); BigDecimal b2 = new BigDecimal(v2.toString()); return new Double(b1.multiply(b2).doubleValue()); } /** * * 两个Double数相除 * * * @param v1 * * @param v2 * * @return Double */ public static Double div(Double v1, Double v2) { BigDecimal b1 = new BigDecimal(v1.toString()); BigDecimal b2 = new BigDecimal(v2.toString()); return new Double(b1.divide(b2, DEF_DIV_SCALE, BigDecimal.ROUND_HALF_UP) .doubleValue()); } /** * * 两个Double数相除,并保留scale位小数 * * * @param v1 * * @param v2 * * @param scale * * @return Double */ 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(v1.toString()); BigDecimal b2 = new BigDecimal(v2.toString()); return new Double(b1.divide(b2, scale, BigDecimal.ROUND_HALF_UP).doubleValue()); } }
java中的Double型加减乘除
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转载自ohmyg.iteye.com/blog/2246224
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