Javaでは、文字列の大文字と小文字を別々に出力します.

}

//         ，   char             ，                   
public void inputUppLowChar() {
    StringBuffer upperCase = new StringBuffer();
    StringBuffer lowerCase = new StringBuffer();
    Scanner input = new Scanner(System.in);
    System.out.print("          ：");
    str = input.nextLine();
    for (int i = 0; i < this.str.length(); i++) {
        char chr = str.charAt(i);
        if (Character.isUpperCase(chr))
            upperCase.append(chr);
        else
            lowerCase.append(chr);
    }
    System.out.println(upperCase.toString());
    System.out.println(lowerCase.toString());
}