用java实现字符串的镜像翻转

public static String doMirroringConvert(String str) {
 str = convertStr(str);
 // 字符串长度
int size = str.length();
 // 是否是偶数
int IsEven = size % 2;
 int centeEndIndex = size % 2 == 0 ? size >> 1 : (size - 1) >> 1;
 StringBuilder sb = new StringBuilder();
// 字符串长度为偶数
if (IsEven == 0) {
    String start = convertStr(str.substring(0, centeEndIndex));
    String end = convertStr(str.substring(centeEndIndex, size));
    sb.append(start).append(end);
}
// 字符串长度为基数
else {
    String start = convertStr(str.substring(0, centeEndIndex));
    String center = convertStr(str.substring(centeEndIndex, centeEndIndex + 1));
    String end = convertStr(str.substring(centeEndIndex + 1, size));
    sb.append(start).append(center).append(end);
}

return sb.toString();


}
 public static String convertStr(String str) {
 // 将String 对象转换为可改变的StringBuffer类对象,然后调用StringBuffer类的reverse()方法实现反转
String strReverse = new StringBuffer(str).reverse().toString();
 return strReverse;
 }