计算自己活了多少岁

public static void timu13(){
Scanner scanner=new Scanner(System.in);
System.out.println("请输入年：");
int shuYear=scanner.nextInt();
System.out.println("请输入月：");
int shuMonth=scanner.nextInt();
System.out.println("请输入日：");
int shuDay=scanner.nextInt();

//获取当前年份，月份，日
Calendar now = Calendar.getInstance();
int year = now.get(Calendar.YEAR);
int month = now.get(Calendar.MONTH) + 1;
int day = now.get(Calendar.DAY_OF_MONTH);

//计算出多少年到多少年的总天数
int day1=yearDays(shuYear, year);
//计算出出生那年已经过了多少天
int day2=passedDays(shuYear, shuMonth, shuDay);
//计算出现在这年已经过了多少天
int day3=passedDays(year, month, day);

System.out.println(day1-day2+day3);
}
//计算出多少年到多少年的总天数
public static int  yearDays(int beginYear,int endYear){
int days=0;
for(int i=beginYear;i<endYear;i++){
days+=isRun(beginYear)?366:365;
}
return days;
}

//计算出这一年已经过了多少天
public static int passedDays(int year,int month,int day){
int days=0;
for(int i=1;i<month;i++){
switch (i) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
days+=31;
break;
case 2:
days+=isRun(year)?29:28;
break;
default:
days+=30;
break;
}
}
System.out.println("这"+year+"年已经过了"+(days+day)+"天");
return days+day;
}
// 判断是否为闰年
public static boolean isRun(int year) {
if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
return true;
} else {
return false;
}
}