CopyOnWriteArrayList get() method in Java

Last Updated : 26 Nov, 2018

The get(index) method of CopyOnWriteArrayList returns the element at the specified index. Syntax:

public E get(int index)

Parameters: The function accepts a mandatory parameter index which specifies the index of the element to be returned. Return Value: The function returns the element at the given index. Exceptions: The function throws IndexOutOfBoundsException if the index is out of range. Below programs illustrate the above function: Program 1:

Java

// Java Program to illustrate the 
// CopyOnWriteArrayList get() method in Java
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.*;

public class GFG {
    public static void main(String[] args)
    {

        // create object of CopyOnWriteArrayList
        CopyOnWriteArrayList<Integer> ArrLis
            = new CopyOnWriteArrayList<Integer>();

        // Add elements
        ArrLis.add(32);
        ArrLis.add(67);
        ArrLis.add(98);
        ArrLis.add(100);

        // print CopyOnWriteArrayList
        System.out.println("CopyOnWriteArrayList: " 
                                          + ArrLis);

        // 2nd index in the arraylist
        System.out.println("Element at 2nd index: " 
                                    + ArrLis.get(2));
    }
}

Output:

CopyOnWriteArrayList: [32, 67, 98, 100]
Element at 2nd index: 98

Program 2:

Java

// Java Program to illustrate the 
// CopyOnWriteArrayList get() method in Java
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.*;

public class GFG {
    public static void main(String[] args)
    {

        // create object of CopyOnWriteArrayList
        CopyOnWriteArrayList<String> ArrLis
            = new CopyOnWriteArrayList<String>();

        // Add elements
        ArrLis.add("gopal");
        ArrLis.add("gfg");
        ArrLis.add("jgec");
        ArrLis.add("sudo");

        // print CopyOnWriteArrayList
        System.out.println("CopyOnWriteArrayList: " 
                                          + ArrLis);

        // 4th index element of the arraylist
        // out of range, hence error
        System.out.println("CopyOnWriteArrayList: "
                                    + ArrLis.get(4));
    }
}

Output:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 4
    at java.util.concurrent.CopyOnWriteArrayList.get(CopyOnWriteArrayList.java:388)
    at java.util.concurrent.CopyOnWriteArrayList.get(CopyOnWriteArrayList.java:397)
    at GFG.main(GFG.java:24)

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArrayList.html#get-int-