Domande di colloquio per Java Developer presso Skillz

so a total of 5 rounds. Unfortunately I could not get through after the three rounds. First round consist of java test. laptop will be provided to you with 6 tabs open(one question in each tab, you cannot run the program) q1> it was sort of a race condition type solutioon. when one thread satisfies the condition i,e if it is not null, it reaches the second line, by that time, another thread would have made the condition null. Something like that(you have to find the problem in this question and this was the problem) q2>multithreading question : you have to put wait in one of the methods so that both threads finish the execution q3>try catch finally q4>overridding equals and hashcode for hashmap q5>overridding equals method for arraylist q6>implement arraylist Second round was a design question: i was asked to write the code for url shortener and then the vice versa of it. Then the interviewer asked me to make the complete system like when you type google.com, what happens, how the request goes and the complete flow. make sure that you make a load balancer and a caching mechanism in your system. Third round was peer to peer interview: two interviewers came from different background and they asked me behavioral questions