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javapredicate

removeIf() method. removes all the elements from the List

I have a list of user, i want to delete from my list the user with an id < 3

Actually i do this:

[...]
int pid1 = 1;
int pid2 = 2;
int pid3 = 3;
Predicate<Person> personPredicate1 = p-> p.getPid() == pid1;
Predicate<Person> personPredicate2 = p-> p.getPid() == pid2;
Predicate<Person> personPredicate3 = p-> p.getPid() == pid3;
list.removeIf(personPredicate1);
list.removeIf(personPredicate2);
list.removeIf(personPredicate3);
[...]

I think I do not use the right method?

Solution

  • Use a single removeIf:

    list.removeIf(p -> p.getPid() < 3);

    EDIT:

    Based on the error you posted, you are trying to remove elements from an immutable collection, which is not possible.

    You can create a copy of the original List and remove elements from the copy:

    List<Person> copy = new ArrayList<>(list);
copy.removeIf(p -> p.getPid() < 3);