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ArrayList, LinkedList, Stack and Vector
- The implementation classes of List interface are ArrayList, LinkedList, Stack and Vector.
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Method. compact1, compact2, compact3. java.util. Interface List<E> Type Parameters: E - the type of elements in this list. All Superinterfaces: Collection <E>, Iterable <E> All Known Implementing Classes: AbstractList, AbstractSequentialList, ArrayList, AttributeList, CopyOnWriteArrayList, LinkedList, RoleList, RoleUnresolvedList, Stack, Vector.
- Spliterator
API Note: Spliterators, like Iterators, are for traversing...
- LinkedList
Returns a list-iterator of the elements in this list (in...
- Collection
Ensures that this collection contains the specified element...
- Comparator
Returns a null-friendly comparator that considers null to be...
- AbstractList
This class provides a skeletal implementation of the List...
- CopyOnWriteArrayList
A thread-safe variant of ArrayList in which all mutative...
- AttributeList
Represents a list of values for attributes of an MBean. See...
- Stack
The Stack class represents a last-in-first-out (LIFO) stack...
- Package
An iterator for lists that allows the programmer to traverse...
- AbstractSequentialList
This class provides a skeletal implementation of the List...
- Spliterator
- Overview of List collection. List is a fundamental and widely-used collection type in the Java Collections Framework. Basically, a list collection stores elements by insertion order (either at the end or at a specific position in the list).
- Creating a new list. It’s a good practice to declare a list instance with a generic type parameter, for example: List listAnything = new ArrayList (); List listWords = new ArrayList (); List listNumbers = new ArrayList (); List linkedWords = new LinkedList ();
- Basic List operations: adding, retrieving, updating, removing elements. Adding elements to a List: The methods add(Object), add(index, Object) and addAll() are used to add elements to the list.
- Iterating over elements in a list. Basically, we can use the enhanced for loop to iterate through all elements in the list, as follows: for (String element : listStrings) { System.out.println(element); }
Jan 8, 2024 · Overview. When we work with Java, sometimes we want to generate a list from another list of objects. Java 8 introduced a set of new features that streamline such operations. So, in this tutorial, we’ll explore how to create a list of objects of a different type based on a given list, using the powerful features introduced in Java 8 and beyond. 2.
- Kai Yuan
- How to Create List
- Java List Example
- How to Convert Array to List
- How to Convert List to Array
- Get and Set Element in List
- How to Sort List
The ArrayList and LinkedList classes provide the implementation of List interface. Let's see the examples to create the List: In short, you can create the List of any type. The ArrayList and LinkedList classes are used to specify the type. Here, T denotes the type.
Let's see a simple example of List where we are using the ArrayList class as the implementation. Output:
We can convert the Array to List by traversing the array and adding the element in list one by one using list.add() method. Let's see a simple example to convert array elements into List. Output:
We can convert the List to Array by calling the list.toArray() method. Let's see a simple example to convert list elements into array. Output:
The get() method returns the element at the given index, whereas the set() methodchanges or replaces the element. Output:
There are various ways to sort the List, here we are going to use Collections.sort() method to sort the list element. The java.util package provides a utility class Collections which has the static method sort(). Using the Collections.sort()method, we can easily sort any List. Output:
Code sample
al.add(1,"Sachin");System.out.println("element at 2nd position: "+al.get(2));ListIterator<String> itr=al.listIterator();System.out.println("traversing elements in forward direction...");while(itr.hasNext()){...- trimToSize. public void trimToSize() Trims the capacity of this ArrayList instance to be the list's current size. An application can use this operation to minimize the storage of an ArrayList instance.
- ensureCapacity. public void ensureCapacity(int minCapacity) Increases the capacity of this ArrayList instance, if necessary, to ensure that it can hold at least the number of elements specified by the minimum capacity argument.
- size. public int size() Returns the number of elements in this list. Specified by: size in interface Collection size in interface List
- isEmpty. public boolean isEmpty() Returns true if this list contains no elements. Specified by: isEmpty in interface Collection isEmpty in interface List
Jan 31, 2023 · Here are the different implementation classes of the List interface in Java: AbstractList. AbstractSequentialList. ArrayList. AttributeList. CopyOnWriteArrayList. LinkedList. RoleList. RoleUnresolvedList. Stack. Vector. The most commonly used implementation of the List interface are ArrayList and LinkedList.
Lists are ordered collections that use an index for the ordering of the elements within the collection. As such lists have methods for the index that you don't find in other collection types within the The Collections Framework.
