从键盘输入DNA序列字符串，统计并输出A T C G出现的次数 JAVA

从键盘输入DNA序列字符串，统计并输出ACTG出现的次数

public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String s = sc.nextLine();
    int a = 0;
    int t = 0;
    int c = 0;
    int g = 0;
    char[] chars = s.toCharArray();
    for (char aChar : chars) {
        if ('A' == aChar) {
            a++;
        }
        if ('T' == aChar) {
            t++;
        }
        if ('C' == aChar) {
            c++;
        }
        if ('G' == aChar) {
            g++;
        }
    }
    System.out.println("A =" +a + "  T =" +t +"  C ="+ c+"  G =" +g);
}