How compare two ArrayList and remove duplicates?

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Procedure:

  1. Start by creating two ArrayLists and adding the values ​​from the list.
  2. Convert ArrayList to stream using stream() method.
  3. Set the filter condition to distinct using the contains() method.
  4. Collect the filtered values ​​as a list with the collect() method. This list will be a common return element in both lists.
  5. Print list3.

How do you remove duplicates from two ArrayList in Java?

Approach:

  1. Get the ArrayList with duplicate values.
  2. Create a LinkedHashSet from this ArrayList. This will remove duplicates.
  3. Convert this LinkedHashSet back to an ArrayList .
  4. The second ArrayList contains the elements whose duplicates have been removed.

How do I compare two array lists?

There are several ways to compare two ArrayLists in Java:

  1. Java equals() method.
  2. Java method removeAll().
  3. Java keepAll() method.
  4. Java ArrayList. method contains().
  5. Java contentEquals() method.
  6. JavaStream interface.

How do you remove duplicates in ArrayList?

How to remove duplicates from ArrayList in Java?

  1. public class RemoveDuplicateArrayList {
  2. public static void main(String[] args) {
  3. List l=new ArrayList () li>
  4. l. add(mango)
  5. l. add(banana)
  6. l. add(mango)
  7. l. add(Apple)
  8. System. out. println(l.toString())

How do you remove duplicates in ArrayList without using set?

Remove duplicates from array list without using collections

  1. package arrayListRemoveduplicateElements
  2. import java.util. ArrayList
  3. public class RemoveDuplicates {
  4. public static void main(String[] args){
  5. ArrayList al = new ArrayList ()
  6. al.add(java)
  7. al.add(a)
  8. al.add(b)

Does the linked list allow duplicates?

3) ArrayList and LinkedList are an ordered collection, e.g. they preserve the insertion order of the elements, i. H. the first element is added in the first position. 4) ArrayList and LinkedList also allow duplicates and null, unlike any other list implementation e.g. Vector.

Can ArrayList contain duplicates?

ArrayList allows duplicate values ​​while HashSet does not allow duplicate values. Order: ArrayList preserves the order of the object they are inserted into, while HashSet is an unordered collection and does not maintain any order.

How do I know if two ArrayLists have the same element?

You can compare two lists of arrays using the equals() method of ArrayList class, this method accepts a list object as a parameter, compares it with the current object, if there is a match it returns true and otherwise it returns false .

How do I compare two lists?

The methods of comparing two lists are given below.

  1. The cmp() function.
  2. The set() function and the == operator.
  3. The sort() function and the == operator.
  4. The collection.counter() function.
  5. The Reduce() and Map() functions.
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