字母的大小写互换

public static void main(String[] args) {
// 字母大写变小写 小写变大写
String s = “awbgfhgbagvgjuHIBIbkhbk”;
String s1 = “”;
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
// Character.isLowerCase(c);
// Character.isUpperCase(c);
// Character.toLowerCase(c);
boolean isLower = Character.isLowerCase(c);
if (isLower) {
c = Character.toUpperCase(c);
} else {
c = Character.toLowerCase(c);
}
s1 = s1 + c;
}
System.out.println(s1);
}