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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. public static void main (String[] args) throws java.lang.Exception
  11. {
  12. // your code goes here
  13. String a = "aaAAa";
  14.  
  15. char[] chars = a.toCharArray();
  16.  
  17. for (int i = 0; i < chars.length; i++) {
  18. char c = chars[i];
  19. if (Character.isUpperCase(c)) {
  20. chars[i] = Character.toLowerCase(c);
  21. } else if (Character.isLowerCase(c)) {
  22. chars[i] = Character.toUpperCase(c);
  23. }
  24. }
  25.  
  26. System.out.println(new String(chars));
  27. }
  28. }
Success #stdin #stdout 0.04s 711168KB
stdin
Standard input is empty
stdout
AAaaA