Java ArrayList.add() - Syntax & Examples - Tutorial Kart
Java ArrayList.add() ? Syntax & Examples
Java ArrayList.add() ? Examples
In this tutorial, we will learn about the Java ArrayList.add() method, and learn how to use this method to add an element to the ArrayList, with the help of examples.
add(index, element)
ArrayList.add() inserts the specified element at the specified position in this ArrayList.
Syntax
The syntax of add() method with index and element as arguments is
ArrayList.add(int index, E element) where
Parameter Description
index element
The index at which the specified element is to be inserted in this ArrayList. The element to be inserted in this ArrayList.
Returns The method returns void.
Example 1 ? add(index, element)
In this example, we will take an ArrayList of Strings initialized with four elements. We then use add(index, element) method to insert String "k" at index 3 .
Java Program
import java.util.ArrayList; import java.util.Arrays; public class Example {
public static void main(String[] args) { ArrayList arrayList = new ArrayList(Arrays.asList("a", "b", "c", System.out.println("ArrayList before add : " + arrayList); int index = 3; String element = "k"; arrayList.add(index, element); System.out.println("ArrayList before add : " + arrayList);
} }
Output
ArrayList before add : [a, b, c, d] ArrayList before add : [a, b, c, k, d]
add(E element)
ArrayList.add() appends the specified element to the end of this ArrayList.
Syntax
The syntax of add() method with element as argument is
ArrayList.add(E element)
where
Parameter Description
element The element to be appended to this ArrayList.
Returns
The method returns boolean
Example 2 ? add(element)
In this example, we will take an ArrayList of Strings initialized with four elements. We then use add(element) method to append the String "k" at the end of this ArrayList.
method to append the String "k" at the end of this ArrayList.
Java Program
import java.util.ArrayList; import java.util.Arrays; public class Example {
public static void main(String[] args) { ArrayList arrayList = new ArrayList(Arrays.asList("a", "b", "c", System.out.println("ArrayList before add : " + arrayList); String element = "k"; arrayList.add(element); System.out.println("ArrayList before add : " + arrayList);
} }
Output
ArrayList before add : [a, b, c, d] ArrayList before add : [a, b, c, d, k]
Conclusion
In this Java Tutorial, we have learnt the syntax of Java ArrayList.add() method, and also learnt how to use this method with the help of examples.
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