Java uses Stream to set sequence numbers to elements of list

List<Student> finalList=new ArrayList<>();
list1.stream().forEach(z->{
list2.stream().filter(j->Objects.equals(z.getId(), j.getId())).findFirst().ifPresent(i->{
    i.setName(z.getName());
    i.setAge(z.getAge());
    finalList.add(i);
});
});

how do I set the sequence number to I?

Mar.02,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b379c9-2b40f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b379c9-2b40f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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