List<MyClass> distinctByField = myList.stream().reduce(new ArrayList<>(), (List<MyClass> accumulator, MyClass myClass) -> { if (accumulator.stream().noneMatch(item -> item.getField().equals(myClass.getField()))) { accumulator.add(MyClass); } return accumulator; }, (acc1, acc2) -> { acc1.addAll(acc2); return acc1; });
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