I am getting an error in my code and was wondering where I went wrong. It is saying this, "Main.java:4: error: class WordSorter is public, should be declared in a file named WordSorter.java."

// Import the Scanner class

import java.util.Scanner;

public class WordSorter {

public static void main(String[] args) {

// 1. construct an object of the Scanner class that reads keyboard input.

Scanner keyboard=new Scanner(System.in);

// 2. Declare three String variables that will hold three different words the user enters.

String str1,str2,str3;

// 3.Print three requests to the user asking for the first, second, and third word.

System.out.print("Please enter the first word: ");

str1=keyboard.next();

System.out.print("Please enter the second word: ");

str2=keyboard.next();

System.out.print("Please enter the third word: ");

str3=keyboard.next();

// 4. compare the words and sort them

if(str1.compareToIgnoreCase(str2) < 0 && str1.compareToIgnoreCase(str3) < 0)

{

System.out.println(str1);

if(str2.compareToIgnoreCase(str3) < 0) {

System.out.println(str2);

System.out.println(str3);

}

else{

System.out.println(str3);

System.out.println(str2);

}

}

// check if str2 is small

else if(str2.compareToIgnoreCase(str1) < 0 && str2.compareToIgnoreCase(str3) < 0)

{

System.out.println(str2);

if(str1.compareToIgnoreCase(str3) < 0) {

System.out.println(str1);

System.out.println(str3);

}

else{

System.out.println(str3);

System.out.println(str1);

}

}

// check if str3 is small

else

{

System.out.println(str3);

if(str1.compareToIgnoreCase(str2) < 0) {

System.out.println(str1);

System.out.println(str2);

}

else{

System.out.println(str2);

System.out.println(str1);

}

}

}

}