Split function in Java

One problem found today is related to the split function. For example, there is a string a = "a, B, c ";
A. Split (","); returns a string array with a length of 3.
If the string a = "A, C" is executed a. Split (","), the returned string array with a length of 3 is also returned.
If a = "A," execute a. Split (","); at this time, a string array with a length of 1 is returned, and the following is given. If ProgramIf the following characters are used, the array may be out of bounds. You can add a character a = "A," A = "A, end ", in this way, although the length of the array is changed, the array out-of-bounds error will not be generated.