What are the ArrayList methods?

Methods of ArrayList

Method Description
void ensureCapacity(int requiredCapacity) It is used to enhance the capacity of an ArrayList instance.
E get(int index) It is used to fetch the element from the particular position of the list.
boolean isEmpty() It returns true if the list is empty, otherwise false.
Iterator()

Do Arraylists have methods?

Methods of ArrayList class. In the above example we have used methods such as add() and remove(). However there are number of methods available which can be used directly using object of ArrayList class.

Is ArrayList a class or interface?

ArrayList inherits AbstractList class and implements the List interface. ArrayList is initialized by the size.

Is ArrayList an API?

ArrayList is a resizable-array of the list interface. It provides the methods that can be used to manipulate the size of the array whenever required. Each instance of an ArrayList has some capacity, the capacity means the size to store the elements in the ArrayList.

What is iterator in ArrayList?

An Iterator is an object that can be used to loop through collections, like ArrayList and HashSet. It is called an “iterator” because “iterating” is the technical term for looping. To use an Iterator, you must import it from the java. util package.

What is difference between iterator and ListIterator?

The basic difference between Iterator and ListIterator is that both being cursor, Iterator can traverse elements in a collection only in forward direction. On the other hand, the ListIterator can traverse in both forward and backward directions. You can retrieve an index of an element using Iterator.

What is ArrayList class explain any three methods in C#?

Methods

Method Description
Clear() Removes all elements from the ArrayList.
Clone() Creates a shallow copy of the ArrayList.
Contains(Object) Determines whether an element is in the ArrayList.
CopyTo(Array) Copies the entire ArrayList to a compatible one-dimensional Array, starting at the beginning of the target array.

What interfaces does ArrayList implement?

The ArrayList class inherits the AbstractList class and implements the List Interface. The elements of it can be randomly accessed.

Does ArrayList have a toString?

Note: The ArrayList class does not have its own toString() method. Rather it overrides the method from the Object class.

Can I reset an iterator?

There’s no provision for resetting an Iterator, so it’s possible that your only alternative is to manufacture another one from the underlying source. If you can arrange to be using lists exclusively, you will be receiving ListIterator’s which can iterate both forwards and backwards: it still doesn’t provide a reset ()…

How to return an ArrayList in Java?

how to return an object in an arraylist Get an empty box. –> declare an array Go through the Legos, and for each brick –> start a for loop …if it’s yellow put it in the box. Take away the box, which now contains all of the yellow bricks.

What does this Java Iterator do?

Java Iterator. An Iterator is an object that can be used to loop through collections,like ArrayList and HashSet.

  • Getting an Iterator
  • Looping Through a Collection
  • Removing Items from a Collection. Iterators are designed to easily change the collections that they loop through. The remove () method can remove items from a collection while looping.

    • Is iterator a class or interface?

    In Java, Iterator is an interface available in Collection framework in java.util package. It is a Java Cursor used to iterate a collection of objects. It is used to traverse a collection object elements one by one. It is available since Java 1.2 Collection Framework. It is applicable for all Collection classes.