Java System.out.println() question on Strings and numbers

[s3a]

import java.util.Scanner;

public class Eight

{

public static void main (String [] args)

{

Scanner kb;

kb = new Scanner(System.in);

//ANALYZE THIS FURTHER!!!!

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

}

}

Can someone explain what is going on with those numbers because the output is not what I expected it to be.

Any help would be greatly appreciated!
Thanks in advance!

[Finalfantasykid]

I'm not sure what the question is, but I think the correct output based on that code is...



10
1 + 234
1 + 27
12 + 34
(1 + 2)12


I could be wrong, as some of those are tricky, and I'm not good with tricks :P

But with Strings, the + operator acts the same way as the concat() method. So for example...

"Hello ".concat("World");

is equivalent to

"Hello " + "World";

EDIT: I was wrong with a couple of those outputs. I have corrected my original output, now it is correct.

[baizon]

System.out.println(1 + 2 + 3 + 4);
Adding 1+2+3+4
Result: 10


System.out.println("1 + 2" + 3 + 4);
Appending string and numbers.
Result: 1 + 234


System.out.println("1 + 2" + (3 + 4));
Appending string and added numbers (because there are in a bracket and so they have higher priority).
Result: 1 + 27


System.out.println(1 + "2 + 3" + 4);
Appending a number with string and with a number again.
Result: 12 + 34


System.out.println("(1 + 2)" + 3 * 4);
Appending string and added numbers (because multiplication have a higher priority)
Result: (1 + 2)12

I hope that helps.