内存中的存放code segmentdata segmentstackheap存放代码存放代码静态变量，字符串变量静态变量，字符串变量局部变量局部变量new出来的东西出来的东西Birthdate类class BirthDateclass BirthDate private int day;private int day;private int month;private int month;private int year;private int year;public BirthDate(int d,int m,int y)public BirthDate(int d,int m,int y)day=d;month=m;year=y;day=d;month=m;year=y;public void setDay(int d)day=d;public void setDay(int d)day=d;public void setMonth(int m)month=m;public void setMonth(int m)month=m;public void setYear(int y
