Using Methods not Defined in a class that you are calling them from

Question

For one of my assignment I have had to create a class with methods and then create another class to test the methods.
I keep getting the error message "cannot resolve symbol"
And the error points to the line where I am calling the class.
I have put the classes in a package and imported them.
Here is the method I am calling.
public boolean validDate(int day, int month, int year)
if(leapYear(year))
daysInMonth = 29;
else
getNumberOfDaysInMonth(month);
return true;
This is how I am calling it from the test class
if(validDate(day1,month1,year1))
testnewDate.java:38 cannot resolve symbol
symbol : method validDate(int,int,int)
location:class newdate.testnewDate
if(validDate(day1,month1,year1))
^
If anyone is able to help I can give you my java source files if I haven't given enough information.

Answer 1

You can't call another class's method directly from your class. You need to get an object of that class and should call the method using that object.
If you have written public boolean validDate(int day, int month, int year) method in class DateValidator, then from your test class, you have to call that like this,
DateValidator dv = new DateValidator();
if(dv.validDate(day1,month1,year1)) {
// Take actions
Hope it is clear.
Sudha