How do the post increment (i++) and pre increment (++i) operators work in Java?

Question

Can you explain to me the output of this Java code?

int a=5,i;

i=++a + ++a + a++;
i=a++ + ++a + ++a;
a=++a + ++a + a++;

System.out.println(a);
System.out.p         


        

Answer 1

++a is prefix increment operator:

• the result is calculated and stored first,
• then the variable is used.

a++ is postfix increment operator:

• the variable is used first,
• then the result is calculated and stored.

Once you remember the rules, EZ for ya to calculate everything!