To Remove element from the list

objectA.removeIf(x -> conditions);

eg:

objectA.removeIf(x -> blockedWorkerIds.contains(x));

List<String> str1 = new ArrayList<String>();
str1.add("A");
str1.add("B");
str1.add("C");
str1.add("D");

List<String> str2 = new ArrayList<String>();
str2.add("D");
str2.add("E");

str1.removeIf(x -> str2.contains(x)); 

str1.forEach(System.out::println);

OUTPUT: A B C

To remove all elements from an ArrayList, you don't need a loop, use the clear() method:

my_array_list.clear();

list.subList(4, list.size()).clear();

Sublist operations are reflected in the original list, so this clears everything from index 4 inclusive to list.size() exclusive, a.k.a. everything after index 3. Range removal is specifically used as an example in the documentation:

This method eliminates the need for explicit range operations (of the sort that commonly exist for arrays). Any operation that expects a list can be used as a range operation by passing a subList view instead of a whole list. For example, the following idiom removes a range of elements from a list:

     list.subList(from, to).clear();