AbstractList add(E ele) method in Java with Examples

Last Updated : 17 Dec, 2018
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)
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