Get part of list java

Learn to get an element from an ArrayList using its index position. We will be using ArrayList.get[] method to get the object at the specified index of the arraylist.

ArrayList list = //List instance String firstElement = list.get[0]; String sixthElement = list.get[5];

1. ArrayList get[] Method

ArrayList.get[int index] method returns the element at the specified position 'index' in the list.

1.1. Syntax

public Object get[ int index ];

1.2. Method Parameter

index index of the element to return. A valid index is always be between 0 [inclusive] to the size of ArrayList [exclusive].

For example, if ArrayList holds 10 objects then a valid argument index will be between 0 to 9 [both inclusive].

1.3. Return Value

The get[] method returns the reference of the object present at the specified index.

1.4. IndexOutOfBoundsException

An invalid index argument will cause IndexOutOfBoundsException error.

Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 4, Size: 4 at java.util.ArrayList.rangeCheck[ArrayList.java:653] at java.util.ArrayList.get[ArrayList.java:429] at com.howtodoinjava.example.ArrayListExample.main[ArrayListExample.java:12]

2. ArrayList get[] Example

Java program for how to get an object from ArrayList by its index location. In this example, we want to get the object stored at index locations 0 and 1.

import java.util.ArrayList; import java.util.Arrays; public class ArrayListExample { public static void main[String[] args] { ArrayList list = new ArrayList[Arrays .asList["alex", "brian", "charles", "dough"]]; String firstName = list.get[0]; //alex String secondName = list.get[1]; //brian System.out.println[firstName]; System.out.println[secondName]; } }

Program output.

alex brian

Happy Learning !!