1.添加了除数为0的异常处理

ycutilslibrary/src/main/java/com/yc/ycutilslibrary/calculator/YcCalculator.java

@@ -1,5 +1,7 @@
 package com.yc.ycutilslibrary.calculator;
 
+import com.yc.ycutilslibrary.exception.YcCalculateException;
+
 import java.math.BigDecimal;
 
 /**
@@ -53,7 +55,7 @@ public static double multiply(double a, double b) {
      * @param b 除数
      * @return 两个参数的商
      */
-    public static double divide(double a, double b) {
+    public static double divide(double a, double b) throws YcCalculateException {
         return divide(a, b, 3);
     }
 
@@ -66,7 +68,10 @@ public static double divide(double a, double b) {
      * @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 divide(double a, double b, int scale) {
+    public static double divide(double a, double b, int scale) throws YcCalculateException {
+        if (b == 0) {
+            throw new YcCalculateException("除数不能为0!");
+        }
         /*
          * 通过BigDecimal的divide方法进行除法时就会抛异常的，异常如下：
          * java.lang.ArithmeticException: Non-terminating decimal expansion; no exact representable decimal result. at java.math.BigDecimal.divide(Unknown Source)

ycutilslibrary/src/main/java/com/yc/ycutilslibrary/exception/YcCalculateException.java

@@ -0,0 +1,13 @@
+package com.yc.ycutilslibrary.exception;
+
+import com.yc.ycutilslibrary.calculator.YcCalculator;
+
+/**
+ *  计算异常
+ */
+
+public class YcCalculateException extends YcException{
+    public YcCalculateException(String msg) {
+        super(msg);
+    }
+}

ycutilslibrary/src/main/java/com/yc/ycutilslibrary/exception/YcException.java

@@ -0,0 +1,25 @@
+package com.yc.ycutilslibrary.exception;
+
+/**
+ *  基础异常类
+ */
+
+public class YcException extends Exception {
+    private String msg = "";
+
+    public YcException() {
+        this("");
+    }
+
+    public YcException(String msg) {
+        this.msg = msg;
+    }
+
+    public String getMsg() {
+        return msg;
+    }
+
+    public void setMsg(String msg) {
+        this.msg = msg;
+    }
+}