无限循环条件

Question

我目前正在学习Java，并且有一个使用while循环来指示用户输入2个字符串的任务，它会一直提示，直到两个字符串的第一个和最后一个字符相同。我目前在底部有一段代码。当我满足条件时，打印出“宾果”罚款。然而，当我进入while循环时，无论我输入什么输出，它都会保留在我输入的块中，并且是无限循环。我的while条件是否存在问题，或者是while循环中的if条件？

     import java.util.*;

     public class StringTest2{
     public static void main(String[]args){
     Scanner sc = new Scanner(System.in);

     System.out.print("Enter word1: ");
     String word1 = sc.nextLine().toUpperCase();

     System.out.print("Enter word2: ");
     String word2 = sc.nextLine().toUpperCase();


     int word1Length = word1.length();
     int word2Length = word2.length();

     char word1First = word1.charAt(0);
     char word1Last = word1.charAt(word1Length - 1);

     char word2First = word2.charAt(0);
     char word2Last = word2.charAt(word2Length - 1);   


     while(word1First != word2First || word1Last != word2Last){

       if(word1First == word2First && word1Last == word2Last){
            System.out.println("Bingo!");
        }

        if(word1First == word2First || word1Last == word2Last){
            System.out.println("Gotcha!");
            System.out.print("Enter word1: ");
            word1 = sc.nextLine().toUpperCase();

            System.out.print("Enter word2: ");
            word2 = sc.nextLine().toUpperCase();;
        }

        if(word1First != word2First && word1Last != word2Last){
            System.out.println("Mismatch!");
            System.out.print("Enter word1: ");
            word1 = sc.nextLine().toUpperCase();

            System.out.print("Enter word2: ");
            word2 = sc.nextLine().toUpperCase();
        }

    }
    System.out.println("Bingo!");
}

}