docs(java): add tip about java string split

chenyong · chenyong · commit c6c4d12ec4f3 · 2021-05-24T13:53:17.000+08:00
diff --git a/java/basic/java-basic.md b/java/basic/java-basic.md
@@ -1581,4 +1581,6 @@ https://www.ibm.com/developerworks/cn/java/j-lo-javaio/index.html
 * String a = new String("abc");共创建了几个对象
 
 ## 注意点
-1. BigDecimal比较值，不要使用equals，因为0和0.00比较equals会判断false，要使用compareTo()。Compares this BigDecimal with the specified BigDecimal. Two BigDecimal objects that are equal in value but have a different scale (like 2.0 and 2.00) are considered equal by this method.
+1. BigDecimal比较值，不要使用equals，因为0和0.00比较equals会判断false，要使用compareTo()。Compares this BigDecimal with the specified BigDecimal. Two BigDecimal objects that are equal in value but have a different scale (like 2.0 and 2.00) are considered equal by this method.
+
+2. String.split()在分割. |等时需要注意，因为split分割的时候使用了正则, 点需要使用\\.类处理，具体使用时百度下
