Learn to remove duplicate elements in ArrayList in Java using different techniques such as LinkedHashSet in Collections framework and using java 8 stream apis. 1. Remove duplicate elements in arraylist using LinkedHashSet The LinkedHashSet is the best approach for removing duplicate elements in an arraylist. LinkedHashSet does two things internally : Remove duplicate elements Maintain […]

ArrayList spliterator() returns the instance of Spliterator which is last-binding and fail-fast. Java Spliterator is used for traversing and partitioning elements of a source such as array, Set, List or IO channel. 1. ArrayList spliterator() method 1.1. Method definition In case of arraylist, spliterator() method return the instance of ArrayListSpliterator class which in inner class […]

ArrayList removeIf() iterate the list and removes all of the elements of this list that satisfy the given predicate. 1. ArrayList removeIf() method The removeIf() method takes single argument of type Predicate. The Predicate interface is a functional interface that represents a condition (boolean-valued function) of one argument. It checks that is a given argument […]

ArrayList sort() method sorts the list according to the order induced by the specified Comparator instance. All elements in the list must must be mutually comparable. 1. ArrayList sort() method The sort() method accepts an instance of Comparator implementing class which must be able to compare the elements contained in the arraylist. Internally, the sort() […]

ArrayList replaceAll() retains only the elements in this list that are contained in the specified method argument collection. Rest all elements are removed from the list. This method is exact opposite to removeAll() method. 1. ArrayList replaceAll() method The replaceAll() method takes single argument of type UnaryOperator. The UnaryOperator interface is a functional interface that […]