What do the two double quotations do in concatenation

Question

String firstName,lastName;
firstName="Newton";
lastName="Volleyman";
System.out.println("My name is"+firstName+" "+lastName);

Answer 1

in the double quotations you insert a simple space character, so that the output will be : My name is Newton Volleyman;
If you don't put that the output would be: My name is NewtonVolleyman;
It is just used to make the output look clear and easy to read

Answer 2

Double quotes(") are only used to print the text in that command. If double quotes aren't used, it will take it as to print the value of that variable.

Answer 3

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