java，判断身份证的有效性

Question

public judge(){
        System.out.println("请输入参数");
    }

    public judge(String s){

        if(s.length()<=17){
            System.out.println("号码位数错误");
        }else {
            Pattern p = Pattern.compile("\\d{18,19}");
            String year=s.substring(6,9);
            String month=s.substring(10,11);
            String day=s.substring(13,14);
            if(new Integer(year).intValue()>2022){
                System.out.println("身份证号错误");
            }
            if(new Integer(month).intValue()>12){
                System.out.println("身份证号错误");
            }
            if(new Integer(day).intValue()>31){
                System.out.println("身份证号错误");
            }
            Matcher m = p.matcher(s);
            t = m.matches();
        }
    }

    public boolean method(){
        return t;
    }
}
public class main {
    public static void main(String[] args) {
        judge j=new judge("111111202302280000");
        System.out.println(j.method());
    }
}

输出为true。
我不太清楚为什么在judge构造方法中那三个if不会执行，求解答，谢谢

Answer 1

s.substring(6,10)