Java ArrayList.lastIndexOf() Method

public int lastIndexOf(Object o)

The lastIndexOf() method is used to get the index of the last occurrence of an element in an ArrayList object.

Package : java.util

Java Platform : Java SE 8

Syntax:

lastIndexOf(Object o)

Parameters:

Return Value:
The index of the last occurrence of an element in an ArrayList object, or -1 if the element does not exist.

Return Value Type: int

Pictorial presentation of ArrayList.lastIndexOf() Method

Example: ArrayList.lastIndexOf Method

The following example creates an ArrayList containing various colors. It then tries to determine the last position of a certain color.

import java.util.*;
public class test {
  public static void main(String[] args) {

  // create an empty array list with an initial capacity
  ArrayList<String> color_list = new ArrayList<String>(5);
 // use add() method to add values in the list
  color_list.add("White");
  color_list.add("Black");
  color_list.add("Red");
  color_list.add("White");
  color_list.add("Yellow");
  
  System.out.println("Size of list: " + color_list.size());
 // Print the colors in the list
  for (String value : color_list) {
  System.out.println("Value = " + value);
  } 
 // Get the last occurrence of "White" color in color_list
  int pos=color_list.lastIndexOf("White");
  System.out.println("The last occurrence of White color is at :" + pos);
  
  // Get the last occurrence of "Red" color in color_list
  pos=color_list.lastIndexOf("Red");
  System.out.println("The last occurrence of  Red color is at :" + pos);
  }
  }

Output:

F:\java>javac test.java
F:\java>java test
Size of list: 5
Value = White
Value = Black
Value = Red
Value = White
Value = Yellow
The last occurrence of White color is at :3
The last occurrence of  Red color is at :2

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