ArrayList in the Java Collection Framework.

ArrayList Methods in java:

In Java, ArrayList is a part of the Java Collections Framework and provides many useful methods to store, manipulate, and retrieve data dynamically.

Commonly used ArrayList Methods:

1. Adding …


This content originally appeared on DEV Community and was authored by Pavithraarunachalam

ArrayList Methods in java:

In Java, ArrayList is a part of the Java Collections Framework and provides many useful methods to store, manipulate, and retrieve data dynamically.

Commonly used ArrayList Methods:

1. Adding Elements:

  • add(E e)-> Adds the elements at the end

Example: 

List.add("Apple");
  • add(int index, E e) → Adds an element at the specified index.

Example: 

list.add(1, "Banana");
  • addAll(Collection c) → Adds all elements from another collection.

Example: 

list.addAll(otherList);

2.Accessing Elements:

  • get(int index) → Returns the element at the given index.

Examples: 

String fruit = list.get(0);

3. Changing Elements:

  • set(int index, E e) → Updates the element at the specified index.

Example: 

list.set(1, "Mango");

4. Removing Elements:

  • remove(int index) → Removes the element at the given index.

Example: 

list.remove(2);
  • remove(Object o) → Removes the first occurrence of the given element.

Example: 

list.remove("Apple");
  • clear() → Removes all elements from the list.

Example: 

list.clear();
  1. Searching Elements:
  • contains(Object o) → Returns true if the list contains the element.

Example: 

list.contains("Mango");
  • indexOf(Object o) → Returns the first index of the element, or -1 if not found.

Example: 

int index = list.indexOf("Banana");
  • lastIndexOf(Object o) → Returns the last index of the element.

Example: 

int index = list.lastIndexOf("Apple");
  1. Size and Empty Check:
  • size() → Returns the number of elements in the list.

EXample: 

int count = list.size();
  • isEmpty() → Returns true if the list is empty.

Example: 

isEmpty() → Returns true if the list is empty.

7. Converting to Array:

  • toArray() → Converts the list to an array.

Example: 

Object[] arr = list.toArray();

8. Iteration:

  • iterator() → Returns an iterator to traverse the list.

  • listIterator() → Returns a list iterator for forward and backward traversal.

Example: 

Iterator<String> it = list.iterator();

9. Sorting (Using Collections):

Example: 

Collections.sort(list);


This content originally appeared on DEV Community and was authored by Pavithraarunachalam


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