/**
* Calculate frequency of each character
*
* @param evt
*/
private void btn_frequencyActionPerformed(ActionEvent evt) {
String input = taInput.getText();
Map<Character, Integer> character_frequency_unsorted = calc.count_characters(input);
character_frequency = calc.sort_characters(character_frequency_unsorted);
StringBuilder sb = new StringBuilder();
for (Entry<Character, Integer> entry : character_frequency.entrySet()) {
sb.append(entry.getKey()).append(" = ").append(entry.getValue()).append("\n");
}
taOutput.setText(sb.toString());
}
