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

The following two code snippets are equals in compiling level. I write a Demo class like:

public class NewArray {
    public static void main(String[] args) {
        long results[] = new long[3];
    }
}

and

public class NewArray {
    public static void main(String[] args) {
        long results[] = {0,0,0};
    }
}

output of 'javap -c NewArray' is exactly the same:

public static void main(java.lang.String[]);
  Code:
   0:   iconst_3
   1:   newarray long
   3:   astore_1
   4:   return

}

long results[] = new long[]{1,2,3}; and long results[] = {1,2,3}; are exactly the same too.

So,although sometimes you are not using new key word,but the compile will regard them as equal.