From 283d3fbe22a19f1e3f28e1a2ae4717ade45b3d16 Mon Sep 17 00:00:00 2001
From: xiangwbs <xiwnagwbs@163.com>
Date: Tue, 21 Nov 2017 21:05:57 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0doubleutil?=
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---
 .../main/java/com/xwbing/util/DoubleUtil.java | 125 ++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 boot-service/src/main/java/com/xwbing/util/DoubleUtil.java

diff --git a/boot-service/src/main/java/com/xwbing/util/DoubleUtil.java b/boot-service/src/main/java/com/xwbing/util/DoubleUtil.java
new file mode 100644
index 0000000..d2134be
--- /dev/null
+++ b/boot-service/src/main/java/com/xwbing/util/DoubleUtil.java
@@ -0,0 +1,125 @@
+package com.xwbing.util;
+
+import java.math.BigDecimal;
+
+/**
+ * 项目名称: boot-module-demo
+ * 创建时间: 2017/11/21 10:36
+ * 作者: xiangwb
+ * 说明: 数字工具类
+ */
+public class DoubleUtil {
+    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 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 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 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 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("小数位数不能为负数");
+        BigDecimal b1 = new BigDecimal(v1.toString());
+        BigDecimal b2 = new BigDecimal(v2.toString());
+        return b1.divide(b2, scale, BigDecimal.ROUND_HALF_UP).doubleValue();
+    }
+
+    /**
+     * 格式化double 四舍五入
+     *
+     * @param v1
+     * @param scale 小数位
+     * @return
+     */
+    public static Double formate(Double v1, int scale) {
+        BigDecimal bg = new BigDecimal(v1);
+        return bg.setScale(scale, BigDecimal.ROUND_HALF_UP).doubleValue();
+    }
+
+    /**
+     * 不四舍五入保留n位小数
+     *
+     * @param scale 小数位
+     * @param d
+     * @return
+     */
+    public static double decimalND(Double d,int scale) { // 不四舍五入
+        BigDecimal bg = new BigDecimal(d);
+        return bg.setScale(scale, BigDecimal.ROUND_DOWN).doubleValue();
+    }
+
+    /**
+     * 保留n位小数 对非零舍弃部分前面的数字加1
+     *
+     * @param scale 小数位
+     * @param d
+     * @return
+     */
+    public static double decimalNU(Double d, int scale) {
+        BigDecimal bg = new BigDecimal(d);
+        return bg.setScale(scale, BigDecimal.ROUND_UP).doubleValue();
+    }
+
+    public static void main(String[] args) {
+        Double div = div((double) 9, (double) 8, 2);
+        System.out.println(div);
+        div=formate(div,1);
+        System.out.println(div);
+    }
+}
+