Toggle the String

class StringDemo14
{
static String ChangeCase(String s)
{
int i, j;
char c;
String s1="";
for(i=0;i<s.length();i++)
{
j = s.charAt(i);
if(j<=90 && j>=65)
j = (j+32);
else if(j>=97 && j<=122)
j = (j-32);
c = (char)j;
s1 += c;
}
return s1;
}
public static void main(String... S)
{
System.out.println(ChangeCase("InDia"));
}
}