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char[] strs = {'2','4','d','4','2'};
boolean huiwen = isHuiwen(strs, 0, strs.length -1,strs.length);
System.out.println(huiwen);
}

public static boolean isHuiwen(char a[],int low,int high,int length){
if(length == 1 || length == 0)
return true;
if (a[low] != a[high] || low >= high) {
return false;
}

return isHuiwen(a, low + 1, high -1,length -2);