Java SE 17 Developer

The program starts two threads, t1 and t2. The first thread (t1) increments and prints the volatile integer x variable until it is less than 3, while the second thread (t2) increments and prints the AtomicInteger xObj until it is less than 3. Since both increment and print their respective values independently, their outputs can interleave in any order, thus, the program prints t1: 1: t2 : 1: t1 : 2 : t2 : 2: in random order.

A thread in waiting state must handle InterruptedException. When a thread is in a waiting state, it can be interrupted, and it needs to handle InterruptedException to manage this situation appropriately and move back to a runnable state. This ensures that the thread can be managed and controlled correctly.

When Daylight Saving Time ends, the clocks are turned back one hour. On November 7, 2021, in Chicago, the time from 1:00 AM to 2:00 AM occurs twice: once during Daylight Saving Time (UTC-5) and once during Standard Time (UTC-6). This means that 1:30 AM DST and 1:30 AM Standard Time are the same local times but with different offsets. Therefore, the hour remains the same (`true`), but the UTC offset changes (`false`).

The method truncatedTo(ChronoUnit.MINUTES) truncates the Instant object to the nearest minute. Given the loginTime of 2021-01-12T21:58:18.817Z and the logoutTime of 2021-01-12T21:58:19.880Z, both will be truncated to 2021-01-12T21:58:00Z. After truncation, loginTime and logoutTime are equal, so logoutTime.isAfter(loginTime) will return false, and the else statement will execute, printing 'Can't logout'.

The code fragment defines and prints a Duration and a Period. Initially, a Duration of 5000 milliseconds is created, which equals to 5 seconds and will be printed as PT5S. Then the Duration is updated to 60 seconds, which equals to 1 minute and will be printed as PT1M. Finally, a Period of 6 days is printed as P6D. Therefore, the output of the program will be PT5SPT1MP6D.