why return true or return false?

Question

why some one use return true or false in method

Answer 1

just for know that a required condition is true or not

//for example for knowing a number is prime or not , we can use boolean type in the method for checking prime

//hope it helps ☺

Answer 2

I like using true or false returns for the result of a method checking validity of data or testing a condition.

boolean isLeapYear(int year);

boolean checkDate(int month, int day, int year);