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

user_296635 0
Viewed 2257

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?

predicate java
3 Answers

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);
user_12215710

You may call the method only once:

  • without intermediate variable

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

  • with intermediate variable

    Predicate<Person> predicate = p-> p.getPid() < 3;
list.removeIf(predicate);
user_72126860

Here's something you can do using Project Reactor:

Flux.from(list).filter(a -> a.getId() > 3).collectList();  //retuns Mono<List<User>>
user_67144260
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