What does the `new` keyword do

Question

I\'m following a Java tutorial online, trying to learn the language, and it\'s bouncing between two semantics for using arrays.

long results[] = new long[3]         


        

Answer 1

In both cases you create an object.

In first version:

long results[] = new long[3];
results[0] = 1;
results[1] = 2;
results[2] = 3;

you say in first line that array size is 3. Then you put values into the array.

In second version:

long results[] = {1, 2, 3};

You create the same array and initialize it in the same line. Java computes, that you gave 3 arguments and makes the new long[3] without Your help :)