Question

您好我正在尝试创建一个检查单词首字母的程序，看看它是否等于最后一个字母。

public class isPalindrome
{
   public static void main(String[] args)
   {
      // Create an array of strings to test.
      String[] testStrings = { "Able was I ere I saw Elba",
                                "Rats live on no evil star",
                               "Four score and seven years ago",
                               "Barrack Obama",
                               "Now is the time for all good men",
                               "Desserts I stressed",
                               "Ask not what your country can do for you",
                               "Kayak",
                               "Vegeta",
                               "A Man, A Plan, a canal, Panama!"};

      for (int i = 0; i < testStrings.length; i++)
      {
         System.out.print("\"" + testStrings[i] + "\"");
         if (Palindrome(stripString(testStrings[i])))
            System.out.println(" is a palindrome.");
         else
            System.out.println(" is not a palindrome.");
      }
   }


   public static String stripString(String strip)
   {
        strip = strip.toUpperCase();
        String stripped= "";
        for (int i= 0; i< strip.length(); i++) 
        {
            if (Character.isLetter(strip.charAt(i)))

                stripped += strip.charAt(i);
        }
        return stripped;
   }


   public static boolean Palindrome(String str)
   {
      boolean status = false;

      if (str.length() <= 1)
         status = true;
      else if (str.charAt(0) == str.charAt(str.length()-1))//Recursive Case
      {    
        status = Palindrome (str.substring (1, str.length()-1));
      }
      return status;
   }
}

Answer 1

我的java编译得很好但没有显示任何内容。

是的确如此：

#~/temp$ javac isPalindrome.java
#~/temp$ java isPalindrome 
"Able was I ere I saw Elba" is a palindrome.
"Rats live on no evil star" is a palindrome.
"Four score and seven years ago" is not a palindrome.
"Barrack Obama" is not a palindrome.
"Now is the time for all good men" is not a palindrome.
"Desserts I stressed" is a palindrome.
"Ask not what your country can do for you" is not a palindrome.
"Kayak" is a palindrome.
"Vegeta" is not a palindrome.
"A Man, A Plan, a canal, Panama!" is a palindrome.

编译后你是不是在运行它？这个命令编译它：

javac isPalindrome.java

然后这个运行它：

java isPalindrome

修改：或者您可能需要：

java -cp . isPalindrome

...告诉Java在当前目录中查找类。（我不是在我很大程度上没有定制的Java安装，但你曾经不得不这样做，所以......）

偏离主题：这是没有与问题有关，但是：在Java中，编码约定（您可以自由忽略）就是那个类名称以大写字母开头，方法名称以小写字母开头。因此，该类将为IsPalindrome（或PalindromeTester或其他内容），然后方法Palindrome将为isPalindrome或类似。如果你使用这个约定，那么与其他人一起工作会更容易，因为你不会把它们与不寻常的事物命名混淆。： - ）

我的java编译得很好，但什么也没显示

1 个答案: