Issue with output of java program involving string

Question

class Blue_ManTest{

    public static void main(String[] args){
        String name = "I LOVE JAVAWORLD";
        int index1 = name.indexOf(" ");
        int index2 = name.lastIndexOf(" ");
        String str1 = name.substring(0, index1);
        String str2 = name.substring(index1 + 1, index1+ 5);
        String str3 = name.substring(index2 + 5);
        System.out.println(str3 + ", " + str1 + " " + str2 + ".");
    }
}

I am having trouble figuring out what would be the output of this program I think I know it but I am not sure.

I did this I Love JavaWorld with 0 corresponding to j and 15 to D with 1 being the space between.

for str1 I get I

for str2 I get Love

but for str3 I get avaWorld

But str3 seems wrong to me as it would print out.

avaWorld, I  Love.

String 3 is confusing me how does it work because it starts index 2 which is L plus 5 which is 7 and give you J — Fernando Martinez
– Fernando Martinez, Commented Sep 14, 2013 at 22:10

nnnnnn · Accepted Answer · 2013-09-15 00:32:53Z

1

Your str3 variable is taking a substring that starts at index2 + 5 where index2 is the index of the last space in your input string:

int index2 = name.lastIndexOf(" ");

That is, index2 is 6. And of course 6 + 5 is 11.

edited Sep 15, 2013 at 0:32

answered Sep 14, 2013 at 22:10

nnnnnn

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3 Comments

Fernando Martinez Over a year ago

and index 2 is that not L in I LOVE JAVAWORLD ?

Fernando Martinez Over a year ago

Yes I think what confused me is that index1 = name.indexOf(" "); the quotation marks mean blank because they have nothing inside.

nnnnnn Over a year ago

The quotation marks don't have nothing inside, they have a single space character.

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