Java List | Java Tutorial For Beginners

Pubblicato il: 06 maggio 2019
sul canale di: Besant Technologies

433

Java List Interface is the subinterface of Collection. It contains index-based methods to insert and delete elements. It is a factory of Java List Iterator interface.

Java List Interface declaration public interface List(E) extends Collection(E)

Methods of Java List - void add(int index, E element) - It is used to insert the specified element at the specified position in a list.

boolean add(E e) - It is used to append the specified element at the end of a list.

boolean addAll - It is used to append all of the elements in the specified collection to the end of a list.

boolean addAll - It is used to append all the elements in the specified collection, starting at the specified position of the list.

void clear() - It is used to remove all of the elements from this list.

boolean equals(Object o) - It is used to compare the specified object with the elements of a list.

int hashcode() - It is used to return the hash code value for a list.

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.

int lastIndexOf(Object o) - It is used to return the index in this list of the last occurrence of the specified element, or -1 if the list does not contain this element.

Object[] toArray() - It is used to return an array containing all of the elements in this list in the correct order.

T[] toArray(T[] a) - It is used to return an array containing all of the elements in this list in the correct order.

boolean contains(Object o) - It returns true if the list contains the specified element

boolean containsAll - It returns true if the list contains all the specified element

int indexOf(Object o) - It is used to return the index in this list of the first occurrence of the specified element, or -1 if the List does not contain this element.

E remove(int index) - It is used to remove the element present at the specified position in the list.

boolean remove(Object o) - It is used to remove the first occurrence of the specified element.

boolean removeAll - It is used to remove all the elements from the list.

void replaceAll(UnaryOperatoroperator) - It is used to replace all the elements from the list with the specified element.

void retainAll - It is used to retain all the elements in the list that are present in the specified collection.

E set(int index, E element) - It is used to replace the specified element in the list, present at the specified position.

void sort - It is used to sort the elements of the list on the basis of specified comparator.

Spliterator spliterator() - It is used to create spliterator over the elements in a list.

List(E) subList(int fromIndex, int toIndex) - It is used to fetch all the elements lies within the given range.

int size() - It is used to return the number of elements present in the list.

Java List Example :-
import java.util.*;
public class ListExample{
public static void main(String args[]){
List(String) al=new ArrayList(String)();
al.add("xzy");
al.add("Abc");
al.add("Sdc");
al.add(1,"Vcd");
System.out.println("An element at 2nd position: "+al.get(2));
for(String s:al){
System.out.println(s);
}
}
}

Java List Output:
An element at 2nd position: Abc
xzy
Vcd
Abc
Sdc

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