Java Code That Prints Reverse of Given ArrayList

So I was trying to write a method which returns the reverse of given ArrayList but it gives me Index error and I don't know how to solve it. I appreciate your help. This is my code:

import java.util.ArrayList;

public class question2 {

public static ArrayList<Double> reverse(ArrayList<Double> arraylist) {
	ArrayList<Double> result = new ArrayList<Double>();
	for(int i=0; i<arraylist.size(); i++) {
		result.set((arraylist.size()) - 1 - i, arraylist.get(i));
	}
	return result;
}
 
public static void main(String[] args) {
	
	ArrayList<Double> doubles = new ArrayList<Double>();
	doubles.add(1.5);
	doubles.add(2.3);
	doubles.add(7.7);
	doubles.add(8.6);
	System.out.println(reverse(doubles));
	
}

}

And this is the error:

Exception in thread "main" java.lang.IndexOutOfBoundsException: Index 3 out of bounds for length 0

public static ArrayList<Double> reverse(ArrayList<Double> arraylist) {
       ArrayList<Double> result = new ArrayList<Double>(arraylist.size());
        for(int i=arraylist.size()-1; i>=0; i—-) {
            result.add(arraylist.get(i));
        }
        return result;
     }

Hope this will work!

Here is something you may want to try. It does not require a separate List and only loops half as many times as copying the entire list to another one.

It works by swapping the values at the beginning and the end as the loop index moves closer toward the middle.

• set size = list.size();
• iterate the loop from 0 to i < size/2
• save the value at i to a variable.
• set the position at i to the value at size - i - 1
• set the position at size - i - 1 to the saved value.

This will proceed until the loop has reached the middle. Note that for even sized lists, the inner most values are adjacent and swapped. For odd sized lists, the inner most item is ignored since it is correctly positioned.

Can you try my code , it will work for you

 public static List<Double> reverse(ArrayList<Double> arraylist) {
        List<Double> result = Arrays.asList(new Double[arraylist.size()]);
        for(int i=0; i<arraylist.size(); i++) {
            result.set((arraylist.size()) - 1 - i, arraylist.get(i));
        }
        return result;
    }

public static String reverse(ArrayList<Double> arraylist) {
ArrayList<Double> result = new ArrayList<Double>();
for(int i=arraylist.size() -1; i>=0; i--) {
    result.add(arraylist.get(i));
}
return result.toString();

}

the return type of reverse() method should be char[] or String as you are printing on the console from the main method