java如何判断时间的早中晚

 public static String getDateSx(){
        String nihao = "";
        Calendar cal = Calendar.getInstance();
        int hour = cal.get(Calendar.HOUR_OF_DAY);
        if (hour >= 6 && hour < 8) {
            System.out.println("早上好");
            nihao = "早上好";
        } else if (hour >= 8 && hour < 11) {
            System.out.print("上午好");
            nihao = "上午好";
        } else if (hour >= 11 && hour < 13) {
            System.out.print("中午好");
            nihao = "中午好";
        } else if (hour >= 13 && hour < 18) {
            System.out.print("下午好");
            nihao = "下午好";
        } else {
            System.out.print("晚上好");
            nihao = "晚上好";
        }
        return nihao;
    }

    public static void main(String [] asd){
        getDateSx();
    }