跳过第一次出现并在Java中分割字符串

I want to skip first occurrence if no of occurrence more than 4. For now I will get max of 5 number underscore occurrence. I need to produce the output A_B, C, D, E, F and I did using below code. I want better solution. Please check and let me know. Thanks in advance. I want to skip first occurrence if no of occurr