金额类型字段 + - * / 处理

src/main/java/aiyh/utils/AmountHandler.java

@@ -0,0 +1,178 @@
+package aiyh.utils;
+
+/**
+ * @Author DYS
+ * @Date 2023/3/25 18:08
+ * @description create at weaver
+ */
+
+import java.io.Serializable;
+import java.math.BigDecimal;
+
+/**
+ * 金额类型. 支持自身的四则运算，并将this返回.
+ */
+public class AmountHandler implements Serializable {
+
+    private BigDecimal value;
+
+    /**
+     * 提供默认精度10
+     */
+    private int scale = 10;
+
+    public AmountHandler() {
+
+    }
+
+    /**
+     * double类型构造函数
+     *
+     * @param value
+     */
+    public AmountHandler(double value) {
+        this.value = new BigDecimal(Double.toString(value));
+    }
+
+    /**
+     * String类型构造函数
+     *
+     * @param value
+     */
+    public AmountHandler(String value) {
+        this.value = new BigDecimal(value);
+    }
+
+    /**
+     * 取得BigDecimal的值
+     *
+     * @return
+     */
+    public BigDecimal getValue() {
+        return this.value;
+    }
+
+    /**
+     * 两个double类型的数值相加
+     *
+     * @param v1
+     * @param v2
+     * @return
+     */
+    public double add(double v1, double v2) {
+        AmountHandler a1 = new AmountHandler(v1);
+        AmountHandler a2 = new AmountHandler(v2);
+        return add(a1, a2);
+    }
+
+    /**
+     * 两数相除
+     *
+     * @param v1
+     * @param v2
+     * @return
+     */
+    public double div(double v1, double v2) {
+        AmountHandler a1 = new AmountHandler(v1);
+        AmountHandler a2 = new AmountHandler(v2);
+        return this.divide(a1, a2);
+    }
+
+    /**
+     * 相减
+     *
+     * @param v1
+     * @param v2
+     * @return
+     */
+    public double sub(double v1, double v2) {
+        AmountHandler a1 = new AmountHandler(v1);
+        AmountHandler a2 = new AmountHandler(v2);
+        return this.subtract(a1, a2);
+    }
+
+    /**
+     * 相乘
+     *
+     * @param v1
+     * @param v2
+     * @return
+     */
+    public double mul(double v1, double v2) {
+        AmountHandler a1 = new AmountHandler(v1);
+        AmountHandler a2 = new AmountHandler(v2);
+        return this.multiply(a1, a2);
+    }
+
+    /**
+     * 两个Amount类型的数据进行相加
+     *
+     * @param v1
+     * @param v2
+     * @return
+     */
+    public double add(AmountHandler v1, AmountHandler v2) {
+        return v1.getValue().add(v2.getValue()).doubleValue();
+    }
+
+    /**
+     * 两个Amount类型变量相除
+     *
+     * @param v1
+     * @param v2
+     * @return
+     */
+    public double divide(AmountHandler v1, AmountHandler v2) {
+        if (scale < 0) {
+            throw new IllegalArgumentException("精度指定错误,请指定一个>=0的精度");
+        }
+        return v1.getValue().divide(v2.getValue(), scale,
+                BigDecimal.ROUND_HALF_UP).doubleValue();
+    }
+
+    /**
+     * 两数相乘
+     *
+     * @param v1
+     * @param v2
+     * @return
+     */
+    public double multiply(AmountHandler v1, AmountHandler v2) {
+        return v1.getValue().multiply(v2.getValue()).doubleValue();
+    }
+
+    /**
+     * 两数相减
+     *
+     * @param v1
+     * @param v2
+     * @return
+     */
+    public double subtract(AmountHandler v1, AmountHandler v2) {
+        return v1.getValue().subtract(v2.getValue()).doubleValue();
+    }
+
+    /**
+     * 返回value的浮点数值
+     *
+     * @return
+     */
+    public double doubleValue() {
+        return this.getValue().doubleValue();
+    }
+
+    /**
+     * 设置精度
+     *
+     * @param scale
+     */
+    public void setScale(int scale) {
+        this.scale = scale;
+    }
+
+    public static void main(String[] args) {
+        AmountHandler AmountHandler = new AmountHandler(5000.23);
+        AmountHandler AmountHandler1 = new AmountHandler(2033.37);
+        System.out.println(new AmountHandler().add(AmountHandler, AmountHandler1));
+    }
+}