Q:

Replace an element at given index of a List with new element in Java

belongs to collection: Java List Programs

mahmoud2506
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2022-05-07
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Given a list of the integers and we have to replace it an element from specified index with a new element in java.

To replace an element in the list - we use List.set() method.

List.set() method

List.set() method replaces an existing element at given index with new element and returns the old object/element.

Syntax:

    Object List.set(index, new_object);

Example:

    Input:
    List = [10, 20, 30, 40, 50]
    Index =1 
    new_element = 1000

    Output:
    Updated list =[10, 1000, 30, 40, 50]

 

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mahmoud2506
2022-05-07
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Program:

import java.util.*;

public class ListExample {
  public static void main(String[] args) {
    //creating a list of integers
    List < Integer > int_list = new ArrayList < Integer > ();

    //adding some of the elements 
    int_list.add(10);
    int_list.add(20);
    int_list.add(30);
    int_list.add(40);
    int_list.add(50);

    //replace elements
    int old_ele, new_ele, index;
    index = 0;
    new_ele = 12;
    old_ele = int_list.set(index, new_ele);
    System.out.println(old_ele + " is replace with " + new_ele);

    index = 2;
    new_ele = 24;
    old_ele = int_list.set(index, new_ele);
    System.out.println(old_ele + " is replace with " + new_ele);

    //printing updated list 
    System.out.println("updated list: " + int_list);
  }
};

Output

 
10 is replace with 12
30 is replace with 24
updated list: [12, 20, 24, 40, 50]

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