How do I fix the code in Java. Error FinalExamAnswers.java:3: error: class FinalExamAnswer is public, should be declared in a file named FinalExamAnswer.java

How do I fix the code in Java.

Error

FinalExamAnswers.java:3: error: class FinalExamAnswer is public, should be declared in a file named FinalExamAnswer.java

public class FinalExamAnswer{

          ^

Code:

import java.util.Scanner;

    public class FinalExamAnswer{
    public static void main(String [] args)
    {
        manipulateString(); //calls function
    }

    //your code here
    public static void manipulateString()
    {
        Scanner sc=new Scanner(System.in);  //create Scanner instance
        
        System.out.print("Enter a sentence: ");
        String sentence=sc.nextLine();  //input a sentence
        
        String[] words=sentence.split(" "); //split the sentence at space and store it in array
        
        for(int i=0;i<words.length;i++) //i from 0 to last index
        {
            if(i%2==0)  //if even index
                words[i]=words[i].toUpperCase();    //converted to upper case
            else        //if odd index
                words[i]=words[i].toLowerCase();    //converted to lower case
        }
        
        for(int i=words.length-1;i>=0;i--)  //i from last index to 0
        {
            System.out.print(words[i]+" ");     //print word at index i and space
        }
    }
}