How do you add all elements to a list in Java?

How do I add all elements to an ArrayList?

Java ArrayList example to add elements

  1. import java.util.*;
  2. class ArrayList7{
  3. public static void main(String args[]){
  4. ArrayList<String> al=new ArrayList<String>();
  5. System.out.println(“Initial list of elements: “+al);
  6. //Adding elements to the end of the list.
  7. al.add(“Ravi”);
  8. al.add(“Vijay”);

What does addAll () do in Java?

The addAll() method of java. util. Collections class is used to add all of the specified elements to the specified collection. Elements to be added may be specified individually or as an array.

How do you add multiple elements to an ArrayList in Java?

Add Multiple Items to an Java ArrayList

  1. List<Integer> anotherList = Arrays. asList(5, 12, 9, 3, 15, 88); list. …
  2. List<Integer> list = new ArrayList<>(); Collections. addAll(list, 1, 2, 3, 4, 5);
  3. List<Integer> list = new ArrayList<>(); Integer[] otherList = new Integer[] {1, 2, 3, 4, 5}; Collections.

What is LinkedList in Java?

Linked List is a part of the Collection framework present in java. util package. This class is an implementation of the LinkedList data structure which is a linear data structure where the elements are not stored in contiguous locations and every element is a separate object with a data part and address part.

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What does set Add return?

Return Value: The function returns True if the element is not present in the set and is new, else it returns False if the element is already present in the set.

What is retainAll in Java?

The retainAll() method of ArrayList is used to remove all the array list’s elements that are not contained in the specified collection or retains all matching elements in the current ArrayList instance that match all elements from the Collection list passed as a parameter to the method.

What does ArrayList size return?

ArrayList to find the length or size of ArrayList in Java. The size() method returns an integer equal to a number of elements present in the array list. … Also, when an ArrayList is first created it is called empty ArrayList, and size() will return zero. If you add elements then size grows one by one.

How do you add multiple numbers in Java?

SumOfNumbers4.java

  1. public class SumOfNumbers4.
  2. {
  3. public static void main(String args[])
  4. {
  5. int x = Integer.parseInt(args[0]); //first arguments.
  6. int y = Integer.parseInt(args[1]); //second arguments.
  7. int sum = x + y;
  8. System.out.println(“The sum of x and y is: ” +sum);

How do you push multiple elements in an array?

How to add multiple objects to a single array list in Javascript?

  1. push() To add multiple objects at the end of an array, you can repeatedly call push on it. …
  2. unshift() To add multiple objects at the start of an array, you can repeatedly call unshift on it. …
  3. Using the spread operator.

How do you add something to a LinkedList?

You can add elements to either the beginning, middle or end of the linked list.

  1. Insert at the beginning. Allocate memory for new node. Store data. Change next of new node to point to head. …
  2. Insert at the End. Allocate memory for new node. Store data. Traverse to last node. …
  3. Insert at the Middle.
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How do you add elements in the middle of 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 in the list.
  2. Create another class InsertMid which has three attributes: head, tail, and size that keep tracks of a number of nodes present in the list.
  3. addNode() will add a new node to the list: Create a new node.
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