java - 回文编码

Question

我正在尝试使用一种方法在java中创建一个回文测试器..这就是我到目前为止所拥有的。它是如此接近，我只是不明白为什么它不会说它是回文并将其反转。

System.out.println("Fun with Palindromes!!");

    Scanner in = new Scanner(System.in);
    System.out.println("Enter the potential palindrome (or enter exit to quit): ");
    String x = in.nextLine();

    while(!x.equals("exit"))
    {
        String t = x.toLowerCase();
        String u = CleanUpString(t);
        Boolean wordCheck = checkPalindrome(u);
        int wordCount = x.length();

        String rev = "";

        for(int i = 0; i <x.length(); i++)
        {
            rev = x.charAt(i)+rev;
        }
        if(wordCheck == true)
        {
            System.out.println("The orginal string\"" + u + "\" contains" + wordCount + "characters." );
            System.out.println("The converted string\"" + rev + "\"is a palindrome");
        }
        else if(wordCheck == false)
        {
            System.out.println("The string \"" + u + "\" contains " + wordCount + " characters");
            System.out.println("\"" + rev + "\" is not a palindrome");
        }
    System.out.println("\nEnter the potential palindrome, or enter exit to quit: ");
    x = in.nextLine();

    }
}   
    public static String CleanUpString(String words)
    {
        words = words.replace(".","");
        words = words.replace("," ,"");
        words = words.replace(":","");
        words = words.replace("!","");
        return words;


    }   



    public static boolean checkPalindrome(String baseball)
    {
        String rev = "";
        for(int i = 0; i<baseball.length()-1; i++)
            {
                rev = baseball.charAt(i) + rev;

            }
        if(rev.equals(baseball))
            return true;
        else
            return false;

    }

}

Answer 1

这是我用来判断一个字符串是否是回文字符串的代码:

private static boolean checkPalindrome(String str){
    if (str == null) 
        return false;
    int len  = str.length();
    for (int i=0;i<len/2 ; i++){
        if (str.charAt(i) != str.charAt(len - i - 1)){
            return false;
            }
    }       
    return true;
}

要反转字符串，您可以简单地使用:

String reverse = new StringBuffer(string).reverse().toString();

希望这些可以帮助到你。