字母大小写转换并倒序输出

public char[] swith(String s) {

int length = s.length();

char[] result = new char[length];

for (int i = 0; i < length; i++) {

char charAt = s.charAt(i);

if (Character.isLowerCase(charAt)) {

char upperCase = Character.toUpperCase(charAt);

result[length - i - 1] = upperCase;

} else {

char lowerCase = Character.toLowerCase(charAt);

result[length - i - 1] = lowerCase;

}

}

return result;

}