Java CopyOnWriteArrayList lastIndexOf(E e, int index) Method

The lastIndexOf(E e, int index) method of Java CopyOnWriteArrayList class returns the index of the last occurrence of the specified element in this list which is searched backward from the index. If the element is not found, this method will return -1.

Syntax:

Parameters:

e - element to search for

index - index to start searching backward from

Returns:

This method returns the index of the last occurrence of the element at a position less than or equal to index in this list. This method returns -1 if the element is not found.

Example 1

import java.util.concurrent.CopyOnWriteArrayList;

public class CopyOnWriteArrayListLastIndexOfExample1{
	
	public static void main(String[] args) {
		//Initializing CopyOnWriteArrayList of Integers
		CopyOnWriteArrayList<Integer>numbers = new CopyOnWriteArrayList<>(new Integer[] {1,2,1,4,5,3,3,8});
		//Prints the index of the last occurrence of the specified element in this list, searching backwards from index, or returns -1 if the element is not found.
		System.out.println("Last Index of 3 is : " + numbers.lastIndexOf(3, 7));	
			}
	}

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Output:

Last Index of 3 is : 6

Example 2

import java.util.concurrent.CopyOnWriteArrayList;

public class CopyOnWriteArrayListLastIndexOfExample2{
	
	public static void main(String[] args) {
		//Initializing CopyOnWriteArrayList of Integers
		CopyOnWriteArrayList<Integer>numbers = new CopyOnWriteArrayList<>(new Integer[] {1,2,1,4,5,3,3,8});
		//Prints the index of the last occurrence of the specified element in this list, searching backwards from index, or returns -1 if the element is not found.
		System.out.println("Last Index of 3 is : " + numbers.lastIndexOf(11, 7));
			}
		}

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Output:

Last Index of 11 is : -1

Example 3

import java.util.concurrent.CopyOnWriteArrayList;

public class CopyOnWriteArrayListLastIndexOfExample3{
	
	public static void main(String[] args) {
		//Initializing CopyOnWriteArrayList of Strings
		CopyOnWriteArrayList<String>listOfNames = new CopyOnWriteArrayList<>(new String[] {"Tom","Harry","John","John","John","Jerry"});
		//Prints the index of the last occurrence of the specified element in this list, searching backwards from index, or returns -1 if the element is not found.
		System.out.println("Last Index of John is : " + listOfNames.lastIndexOf("John", 5));
			}
		}

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Output:

Last Index of John is : 4

Example 4

import java.util.concurrent.CopyOnWriteArrayList;

public class CopyOnWriteArrayListLastIndexOfExample4{
	
	public static void main(String[] args) {
		//Initializing CopyOnWriteArrayList of Strings
		CopyOnWriteArrayList<String>listOfNames = new CopyOnWriteArrayList<>(new String[] {"Tom","Harry","John","John","John","Jerry"});
		//Prints the index of the last occurrence of the specified element in this list, searching backwards from index, or returns -1 if the element is not found.
		System.out.println("Last Index of Lincoln is : " + listOfNames.lastIndexOf("Lincoln", 5));	
			}	
	}

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Output: