java字符串翻转

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问题描述：翻转一个字符串，并把小写变成大写，大写变成小写。

代码实现：

package leetcoder;import java.util.*;public class Solution1 {public static String trans(String s, int n) {if (s == null)return null;char[] ch = new char[n + 1];for (int i = 0; i < n; i++) {char c = s.charAt(i);if (c >= 'a' && c <= 'z')ch[i] = (char) (c - 32);else if (c >= 'A' && c <= 'Z')ch[i] = (char) (c + 32);elsech[i] = c;}ch[n] = '\0';int i = 0, j = s.length() - 1;while (i < j) {char temp = ch[i];ch[i] = ch[j];ch[j] = temp;i++;j--;}i = 0;j = 0;while (j != n + 1 && i != n + 1) {if (ch[i] == ' ') {i++;j++;} else if (ch[j] == ' ' || ch[j] == '\0') {int tempj = j;int tempi = i;--tempj;while (tempi < tempj) {char temp = ch[tempi];ch[tempi] = ch[tempj];ch[tempj] = temp;tempi++;tempj--;}i = ++j;} else {j++;}}String str = new String(ch);return str;}public static void main(String[] args) {String s = "      This is a simple";System.out.println(trans(s, s.length()).toString());}}

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