PwC Java Software Developer interview questions

Worst Interview experience till now. Some 200 candidates appeared for the interview, they made everyone wait for almost 6 to 7 hours. They even took away our phones and made us sit simply in a room. They made us wait and wait. After some 5 and half hours my turn came for the interview. The interviewer asked me about myself. Then he gave me to write a difficult program on stars pattern. After that he asked about Collection framework. Hardly 2 questions he asked and after that he told I will give my feedback to the HR. The whole interview took only some 5mins hardly, for that I had to wait so long(around 6hours). The interviewer was not even interested since it was lunchtime for them. He just left off. Worst experience ever. I dont understand when they dont want to take people then why do they call even.