String s = "п рора а рва вв  ";
char[] charArray = s.toCharArray();
        StringBuilder sb = new StringBuilder();
        for (char curChar : charArray) {
            if (curChar == ',' || curChar == ' ') {
                if (sb.length() == 1) {
                    System.out.println(sb);
                 
                }
                sb = new StringBuilder();
            } else {
                sb.append(curChar);
            }
        }
        if (sb.length() == 1) {
            System.out.println(sb);
      
        }

private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        String s = jTextArea1.getText();
char[] charArray = s.toCharArray();
        StringBuilder sb = new StringBuilder();
        for (char curChar : charArray) {
            if (curChar == ',' || curChar == ' ') {
                if (sb.length() == 1) {
                  jTextArea1.setText(sb.toString());
                 
                }
                sb = new StringBuilder();
            } else {
                sb.append(curChar);
            }
        }
        if (sb.length() == 1) {
            
      jTextArea1.setText(sb.toString());

        }
}