AbstractList add(E ele) method in Java with Examples Last Updated : 17 Dec, 2018 Comments Improve Suggest changes Like Article Like Report The add(E ele) method of AbstractList class in Java is used to insert the specified element to the end of the current list. Syntax: public boolean add(E ele) Where E is the type of element maintained by this AbstractList collection. Parameter: This method accepts a single parameter ele which represents the element to be inserted at the end of this list. Return Value: The function returns a boolean value True if the element is successfully inserted in the List otherwise it returns False. Exceptions: UnsupportedOperationException – It throws this exception if the add() operation is not supported by this list. ClassCastException – It throws this exception if the class of the specified element prevents it from being added to this list. NullPointerException – It throws this exception if the specified element is null and this list does not permit null elements. IllegalArgumentException – It throws this exception if some property of this element prevents it from being added to this list. Below programs illustrate the AbstractList.add(E ele) method: Program 1: Java // Java code to illustrate add(Object o) import java.io.*; import java.util.*; public class AbstractListDemo { public static void main(String[] args) { // create an empty list with an initial capacity AbstractList<Integer> list = new ArrayList<Integer>(5); // use add() method to add elements in the list list.add(15); list.add(20); list.add(25); // prints all the elements available in list for (Integer number : list) { System.out.println("Number = " + number); } } } Output: Number = 15 Number = 20 Number = 25 Program 2: Java // Java code to illustrate add(Object o) import java.io.*; import java.util.*; public class ArrayListDemo { public static void main(String[] args) { // create an empty list with an initial capacity AbstractList<String> list = new ArrayList<String>(5); // use add() method to add elements in the list list.add("Geeks"); list.add("For"); list.add("Geeks"); // prints all the elements available in list for (String str : list) { System.out.print(str + " "); } } } Output: Geeks For Geeks Reference: https://docs.oracle.com/javase/7/docs/api/java/util/AbstractList.html#add(E) Comment More infoAdvertise with us Next Article AbstractList addAll() method in Java with Examples S shubhamsrivastava1490 Follow Improve Article Tags : Java Technical Scripter Technical Scripter 2018 Practice Tags : Java Similar Reads AbstractList in Java with Examples The AbstractList class in Java is a part of the Java Collection Framework and implements the Collection interface and the AbstractCollection class. AbstractList class provides a skeletal implementation of the List interface to minimize the effort required to implement this interface backed by a Rand 7 min read AbstractList add(E ele) method in Java with Examples The add(E ele) method of AbstractList class in Java is used to insert the specified element to the end of the current list. Syntax: public boolean add(E ele) Where E is the type of element maintained by this AbstractList collection. Parameter: This method accepts a single parameter ele which represe 2 min read AbstractList addAll() method in Java with Examples The addAll() method of java.util.AbstractList class is used to insert all of the elements in the specified collection into this list at the specified position. This shifts the element currently at that position (if any) and any subsequent elements to the right (increases their indices). The new elem 5 min read AbstractList clear() method in Java with Examples The clear() method of java.util.AbstractList class is used to remove all of the elements from this list. The list will be empty after this call returns. Syntax: public void clear() Returns Value: This method does not return anything. Below are the examples to illustrate the clear() method. Example 1 2 min read AbstractList equals() method in Java with Examples The equals() method of java.util.AbstractList class is used to compare the specified object with this list for equality. Returns true if and only if the specified object is also a list, both lists have the same size, and all corresponding pairs of elements in the two lists are equal. (Two elements e 3 min read AbstractList get() method in Java with Examples The get() method of java.util.AbstractList class is used to return the element at the specified position in this list. Syntax: public abstract E get(int index) Parameters: This method takes index of the element as a parameter, the element at which is to be returned. Returns Value: This method return 2 min read AbstractList hashCode() method in Java with Examples The hashCode() method of java.util.AbstractList class is used to return the hash code value for this list. Syntax: public int hashCode() Returns Value: This method returns the hash code value for this list. Below are the examples to illustrate the hashCode() method. Example 1: Java // Java program t 2 min read AbstractList indexOf() method in Java with Examples The indexOf() method of java.util.AbstractList class is used to return the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element. More formally, returns the lowest index i such that (o==null ? get(i)==null : o.equals(get(i))), or -1 if t 3 min read AbstractList iterator() method in Java with Examples The iterator() method of java.util.AbstractList class is used to return an iterator over the elements in this list in proper sequence. This implementation returns a straightforward implementation of the iterator interface, relying on the backing list's size(), get(int), and remove(int) methods. Synt 2 min read AbstractList lastIndexOf() method in Java with Examples The lastIndexOf() method of java.util.AbstractList class is used to return the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element. More formally, returns the highest index i such that (o==null ? get(i)==null : o.equals(get(i))), or -1 2 min read Like