翻转句子内单词的顺序，但单词内字符顺序不变，包括标点

如将字符串 "i am a student."翻转后的结果应该为"student. a am i"

 思路：先翻转整个句子，再翻转句子中的单词

两次翻转达到结果（i am a student.）-(.tneduts a ma i)- (student. a am i)

// 思路：先翻转整个句子，再翻转句子中的单词
// 两次翻转达到结果（i am a student.）-(.tneduts a ma i)-
// (students a am i)
public static void main(String[] args) {
	String word = "i am a student.";
	System.out.println("原始字符串："+word);
	// 1、翻转整个句子
	String resultWord=reverse(word.toCharArray());
	System.out.println("翻转整个句子后字符串："+resultWord);
	// 2、翻转句子中的每个单词
	String[] array=resultWord.split(" ");
	System.out.println("翻转句子中每个单词后的字符串：");
	for (int i = 0; i < array.length; i++) {
		array[i]=reverse(array[i].toCharArray());
		System.out.print(array[i]+" ");
	}
}

/*
 * 翻转句子
 */
private static String reverse(char[] word) {
	if (word == null || "".equals(word)) {
		return null;
	} else {
		int start = 0;
		int end = word.length - 1;
		int middle = (start + end) / 2;
		char temp = ' ';
		while (start <=middle && end >= middle) {
			temp = word[start];
			word[start] = word[end];
			word[end] = temp;
			start++;
			end--;
		}
	}
	return new String(word);
}