Question

How to swap two elements in an ArrayList in Java

Answer 1

import java.util.ArrayList;
import java.util.Collections;
import java.util.Arrays;

public class MyClass {
    public static void main(String args[]) {
        ArrayList<Integer> al = new ArrayList<>(Arrays.asList(40, 89, 23, 99, 89)); 
        
        System.out.println(al); 
        
        Collections.swap(al, 0, 2);

        System.out.println(al); 
   
    }
}
     
     
   
     
     
/*
run:
     
[40, 89, 23, 99, 89]
[23, 89, 40, 99, 89]

*/

 

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