How does a=a++ work in java [duplicate]

Answer 1

a = a++;

starts with incrementing a, and then reverting a to the old value as a++ returns the not incremented value.

In short it does nothing in Java. If you want to increment, use only the postfix operator like this :

a++;

Answer 2

Because:

a = a++;///will assign 'a' to 'a' then increment 'a' in the next step , but from the first step 'a' is '0' and so on

To get 100 you can do Like this:

a = ++a;////here the 'a' will be increment first then will assign this value to a so a will increment in every step 

or

a++;////here the increment is the only operation will do here 

Answer 3

a++ is a post increment, so a is assigned the value of a (always 0), and the ghost variable of a is incremented afterwards making no difference to the real a and no result being saved. As a result, a is always assigned to 0, thus the code does nothing