java - Compare two objects, and return string. But one object doesn't take parameters? -

this homework.

goal: want compare date of 2 objects decide whether person object adult or not , store in string.

the strange thing is, values of date d1 0;

public class date {    public int day, month, year;     public string child    date(date d1, date d2) {       if ((d1.year - d2.year > 18) ||           ((d1.year  - d2.year == 18) && (d2.year> d1.year)) ||           ((d1.year  - d2.year == 18) && (d2.year == d1.maand) && (d2.day > d1.day))) {              child = adult;         } else {             child = child;   }    date(int a, int b, int c) {     = year;     b = month;      c = day;    }    date (string birthdate) {     string pattern = "\\d{2}-\\d{2}-\\d{4}";     boolean b = birthdate.matches(pattern);     if (b) {         string[] str = birthdate.split("-");          (string s: str)             this.day = integer.parseint(str[0]);             this.month = integer.parseint(str[1]);             this.year = integer.parseint(str[2]);             this.child = false;      } else {           system.out.println("wrong format");     }   } 

when make test, happens:

  system.out.println("d1 year = " + d1.year);    system.out.println("d1 day = " + d1.day);    system.out.println("d1 month = " + d1.month); 

result:  d1 year = 0 d1 day = 0 d1 month = 0 

why happen? lets @ other class.

my other class, method infoperson located following:

    public static person infoperson() {         string name, lastname, birthdate;          datum birthday, today;           system.out.println("firstname:");        name = userinput();          system.out.println("lastname:");        lastname = userinput();         system.out.println("birthdate?:");        birthdate = userinput();          //here send string birthdate date class        birthday = new date(birthdate);         today = new date(3, 7, 2013);          //here want compare 2 date objects, today , birthday. got stuck, how do correctly?       datechild = new date(today, birthday);         // here send new date person class consists of 2 strings , data birthday       return new gast(name, lastname, datechild);      } 

the assignment in constructor reversed:

date(int a, int b, int c) {     = year;    // should year = a;     b = month;   // month = b;     c = day;     // day = c; } 

please don't use class name same 1 defined in java api. date class in java.util package.

apart there many compiler errors in code:

• public string child - isn't going compile. should string not string.
• void compareto(date d1, date d2) - don't know you're trying here. won't compile. undefined type - date
• you've declared datum birthday , initializing using new date(...). wouldn't work.
• for reason, feel don't have method in class, bunch of constructors. suggestion - throw code away, , start afresh.
• and please don't use bunch of integer fields store birthdays. use calendar instance instead.