Combine toUpperCase() and string.charAt()

Hello Experts,

I am trying to combine string.,charAt() and toUpperCase(). What I want to do is take a string; a, and have each letter in a loop made upper case.  This way the program will only print the non-lower case characters.

The statement "a.toUpperCase(a.chatAt(i));" causes my compiler to fail. What statement will allow me to change each char in  string to uppercase like my example bellow.

My goal is to get my program to reprint the string without printing the capital letters.

Thanks in advance.

for (int i = 1; i < a.length(); i++) {
   if (a.charAt(i) != a.toUpperCase(a.chatAt(i))) {
      System.out.print (charAt(i));
   }
}

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