List add(E ele) method in Java with Examples
The add(E ele) method of List interface in Java is used to insert the specified element to the end of the current list.
Syntax:
public boolean add(E ele)
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 RoleList.add(Object obj) method:
Program 1:
import java.io.*;
import java.util.*;
public class ArrayListDemo {
public static void main(String[] args)
{
List<Integer> list = new ArrayList<Integer>( 5 );
list.add( 15 );
list.add( 20 );
list.add( 25 );
for (Integer number : list) {
System.out.println( "Number = " + number);
}
}
}
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Output:
Number = 15
Number = 20
Number = 25
Program 2:
import java.io.*;
import java.util.*;
public class ArrayListDemo {
public static void main(String[] args)
{
List<String> list = new ArrayList<String>( 5 );
list.add( "Geeks" );
list.add( "For" );
list.add( "Geeks" );
for (String str : list) {
System.out.print(str + " " );
}
}
}
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Reference: https://docs.oracle.com/javase/7/docs/api/java/util/List.html#add(E)
Last Updated :
11 Dec, 2018
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