java - Using GregorianCalendar - Error

Question

What is wrong with this code?

GregorianCalendar today = new GregorianCalendar();
GregorianCalendar hundredDays = today.add(GregorianCalendar.DAY_OF_MONTH, 100);

It always returns "incompatible types"

required: GregorianCalendar
found: void

Answer 1

Below is the signature of add

void java.util.GregorianCalendar.add(int field, int amount)

It doesn't return anything. So when you try to assign void to GregorianCalendar, you will get a compilation error