java - 如何将 char 数组传递给方法并返回 boolean 值

Question

我正在尝试编写一个程序来检查一个单词是否是回文。我的代码可以编译，但 isItPalindrome 方法中的代码似乎根本没有运行。我希望有人能指出我哪里出错了。这是我的代码:

class Main
{
public static void main ( String args[] )
{
    System.out.print ("#Enter word");
    String word = BIO.getString();

    String wordLowerCase = word.toLowerCase();                                        // converts word to lower case (only way i could think of to ignore case)
    char letters[] = wordLowerCase.toCharArray();                                     // converts string into an array of character


    while ( !word.equals ("END")){
        if (isItPalindrome(letters) == true)
        {
            System.out.print (""+word+"");
            System.out.println ("   is a palindrome");

        }
        else if (isItPalindrome(letters) == false)
        {
            System.out.print (""+word+"");
            System.out.println ("   is not a palindrome");
        }

        System.out.print ("#Enter word");
        word = BIO.getString();

    }

}

public static boolean isItPalindrome ( char letters[]){

    boolean palindrome = true;
    if (letters.length%2 == 0){
        for (int index=0; index<letters.length/2-1; index++)                              //index will finish at letters/2  
        {
            if (letters[index] != letters[letters.length-index-1])                                       //checks if index is the same as its opposite letter
            {
                return false;

            }
            else                                                                         //if any pairs of letters are not in ascending order then it returns fasle and breaks out of the loop
            {
                palindrome = true;

            }

        }
    }
    else{
        for (int index = 0; index < (letters.length-1)/2-1; index++)
        {
            if (letters[index] != letters[letters.length-index-1]){

                return false;

            }
            else{

                palindrome = true;
            }  

        }
    }

    return palindrome;
}

}

Answer 1

主方法中存在一些问题，例如字符数组从未更新，回文方法过于复杂，这是工作版本:

public static void main(String args[]) {
    System.out.print("#Enter word: ");
    String word = BIO.getString();

    while (!word.equals("END")) {
        char[] letters = word.toLowerCase().toCharArray();

        if (isItPalindrome(letters) == true) {
            System.out.println(word + "   is a palindrome");
        } else {
            System.out.print(word + "   is not a palindrome");
        } // OR
        // Use this one-liner instead of the if:
        // System.out.println(word + isItPalindrome(letters) ?
        //                     "   is a palindrome" : "   is not a palindrome");

    System.out.print("#Enter word: ");
    word = BIO.getString();
    }

}

public static boolean isItPalindrome(char letters[]) {
    for (int i = 0; i < letters.length / 2; i++) {
        if (letters[i] != letters[letters.length - i - 1]) {
            return false;
        }
    }

    return true;
}

希望这有帮助。