Best answer: How do you return a linked list in Java?

How do I return a LinkedList in Java?

Algorithm:

  1. Run the loop for n/2 times where ‘n’ is the number of elements in the linkedlist.
  2. In the first pass, Swap the first and nth element.
  3. In the second pass, Swap the second and (n-1)th element and so on till you reach the mid of the linked list.
  4. Return the linked list after loop termination.

How do you return a list in Java?

The list() method of java. util. Collections class is used to return an array list containing the elements returned by the specified enumeration in the order they are returned by the enumeration. This method provides interoperability between legacy APIs that return enumerations and new APIs that require collections.

How do you initialize a linked list in Java?

Like other list data structures that we have already seen, the linked list can also be initialized using the add method, Arrays. asList () method or by using the constructor with the collection as an argument.

Why we use ArrayList instead of LinkedList?

ArrayList provides constant time for search operation, so it is better to use ArrayList if searching is more frequent operation than add and remove operation. The LinkedList provides constant time for add and remove operations. So it is better to use LinkedList for manipulation.

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How do you define a LinkedList in Java?

Algorithm

  1. Create a class Node which has two attributes: data and next. Next is a pointer to the next node.
  2. Create another class which has two attributes: head and tail.
  3. addNode() will add a new node to the list: Create a new node. It first checks, whether the head is equal to null which means the list is empty.

What are some of the things we can do with linked list?

Applications of linked list data structure

  • Implementation of stacks and queues.
  • Implementation of graphs : Adjacency list representation of graphs is most popular which is uses linked list to store adjacent vertices.
  • Dynamic memory allocation : We use linked list of free blocks.
  • Maintaining directory of names.

Which is true about linked list?

Explanation: Linked lists saves both space and time. … Explanation: To access an element in a linked list, we need to traverse every element until we reach the desired element. This will take more time than arrays as arrays provide random access to its elements.

How do you check if a linked list is empty?

LinkedList class isEmpty() method returns true if the LinkedList object is empty. As the name suggests, the isEmpty() method returns a boolean value i.e true if the list object contains no elements otherwise false.

What is list in collection in Java?

List in Java provides the facility to maintain the ordered collection. It contains the index-based methods to insert, update, delete and search the elements. … The implementation classes of List interface are ArrayList, LinkedList, Stack and Vector. The ArrayList and LinkedList are widely used in Java programming.

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Can I return an ArrayList in Java?

Return an ArrayList From a Non-Static Function in Java

We will work with a function that creates and returns an ArrayList of some size. We will try to invoke this function in another class. This function is non-static, so an object of the class will be needed to invoke it. … The function myNumbers() is not static.

How do you call a method returning a list in Java?

You can call that method like so: public class MySecondClass { … MyFirstClass m1 = new MyFirstClass(); List<Integer> myList = m1. myNumbers(); … } Since the method you are trying to call is not static, you will have to create an instance of the class which provides this method.

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