Why is the output?

Question

System.out.println(1 + 2 + "3" + 4 + 5);

Output: 3345

Why is it not 339?

Answer 1

This is how I see it, hope I get it right;

1 + 2 is done as arithmetic addition operation
When it gets to "3", the + operator is understood as concatenation operator, because "3" is a string, the result of (1 + 2) is then casted as string, concatenated with "3". The 4 and 5 are also treated as string because they came following the "3", hence they are concatenated instead of being added.

Hth, cmiiw

Answer 2

hi Samira
that is because 3 is a string and all the other numbers are integer values.
i hope this helps

Answer 3

You asked why not 339, so you are aware of the auto type casting and plus operator method overloading.

The reason that 4+5 is not arithmetic is because of operator precedence, while ** > * > +
int + and float + and String + has the same precedence.
Hence, if we add parathesis to indicate the sequence, it's like this:
((((1+2)+"3")+4)+5)
Thus the fourth plus sign is string concantention of "334"+"5" instead of 4+5

Answer 4

Thank you so much for these answers! 😊

Answer 5

Because 3 is a string, that is why you do not add 4 + 5?
Then why is 1 + 2 added together?