Java ArrayList.remove(int index) Method

public E remove(int index)

The remove() method is used to remove an element at a specified index from ArrayList. Shifts any subsequent elements to the left (subtracts one from their indices).

Package: java.util

Java Platform: Java SE 8

Syntax:

remove(int index)

Parameters:

Return Value:
The element at the position next to the removed element.

Throws:
IndexOutOfBoundsException - if the index is out of range (index < 0 || index >= size())

Pictorial presentation of ArrayList.remove() Method

Example: ArrayList.remove(int index) Method

The following example creates an ArrayList with a capacity of 7 elements. After adding 7 elements we have removed two elements form 2nd and 5th position.

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>(7);

    // 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");
	color_list.add("Red");
    color_list.add("White");
  
	// Print out the colors in the ArrayList
    System.out.println("****Color list****");
	for (int i = 0; i < 7; i++)
      {
         System.out.println(color_list.get(i).toString());
      }

    // Removes element at 3rd position
    color_list.remove(2);
	
	//New size of the list
	System.out.println("New Size of list: " + color_list.size()); 
	
	// Fresh Color list
    System.out.println("****Fresh Color list****");
	for (int i = 0; i < 6; i++)
      {
         System.out.println(color_list.get(i).toString());
      }
  }
} 
  

Output:

F:\java>javac test.java

F:\java>java test
****Color list****
White
Black
Red
White
Yellow
Red
White
Now, Size of list: 6
****Fresh Color list****
White
Black
White
Yellow
Red
White

Example of Throws: remove(int index) Method

IndexOutOfBoundsException - if the index is out of range (index < 0 || index >= size()).

Let

int index = str.remove(8);

in the above example.

Output:

****Color list****                                     
White                                                  
Black                                                  
Red                                                    
White                                                  
Yellow                                                 
Red                                                    
White                                                  
New Size of list: 6                                    
****Fresh Color list****                               
White                                                  
Black                                                  
White                                                  
Yellow                                                 
Red                                                    
White                                                  
Exception in thread "main" java.lang.IndexOutOfBoundsEx
ception: Index: 6, Size: 6                             
        at java.util.ArrayList.rangeCheck(ArrayList.jav
a:635)                                                 
        at java.util.ArrayList.get(ArrayList.java:411) 
        at test.main(test.java:35) 

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