NTT DATA Test Automation Engineer interview questions

I applied via naukri.com. I got a call from the HR for verification. After that I got a call from another person for screening via telephonic call asking about the strings function in java. After that I was informed that you are selected for the first round of interview. If selected further, the secound round will be HR round and third round will be Managerial round. First round was technical interview. Panel was right on time.