[generator]： main, item:1
[consumer]: main, item:1
[generator]： main, item:5
[consumer]: main, item:5
[generator]： main, item:6
[consumer]: main, item:6
[generator]： main, item:7
[consumer]: main, item:7
[generator]： main, item:8
[consumer]: main, item:8
[generator]： ForkJoinPool.commonPool-worker-7, item:4
[generator]： ForkJoinPool.commonPool-worker-3, item:2
[generator]： ForkJoinPool.commonPool-worker-5, item:3