java no duplicate List code example

Example 1: remove duplicates from list java

ArrayList<Object> withDuplicateValues;
 HashSet<Object> withUniqueValue = new HashSet<>(withDuplicateValues);
 
 withDuplicateValues.clear();
 withDuplicateValues.addAll(withUniqueValue);

Example 2: compare two lists and remove duplicates java

listA.removeAll(new HashSet(listB));

Example 3: remove duplicates from list java

Set<String> set = new HashSet<>(yourList);
yourList.clear();
yourList.addAll(set);