如何确定字符串是回文？

Question

如何测试给定的字符串是否是Java中的回文，而不使用任何方法为我完成这一切？

Answer 1

String palindrome = "..." // from elsewhere 
boolean isPalindrome = palindrome.equals(new StringBuilder(palindrome).reverse().toString()); 

Answer 2

诺埃尔的解决方案实际上更好。但如果它是家庭作业，你可能会想这样做：

public static boolean isPalindrome(String word) { 
    int left = 0; 
    int right = word.length() -1; 

    while (left < right) { 
     if (word.charAt(left) != word.charAt(right)) 
      return false; 

     left++; 
     right--; 
    } 

    return true; 
} 

Answer 3

public boolean checkPalindrome(string word){ 

for(int i=0 ; i < word.length()/2;i++) 
{ 
    if(word.charAt(i) ! = word.charAt(word.length()-1-i)) 

     return false; 
} 

return true; 
} 

Answer 4

的Java就地回文检查：

public static final boolean isPalindromeInPlace(String string) { 
    char[] array = string.toCharArray(); 
    int length = array.length-1; 
    int half = Math.round(array.length/2); 
    char a,b; 
    for (int i=length; i>=half; i--) { 
     a = array[length-i]; 
     b = array[i]; 
     if (a != b) return false; 
    } 
    return true; 
} 

Answer 5

String str="iai"; 

StringBuffer sb=new StringBuffer(str); 
String str1=sb.reverse().toString(); 
if(str.equals(str1)){ 
    System.out.println("polindrom"); 
} else { 
    System.out.println("not polidrom"); 
}