java screen output?

Question

Java

Hello everyone
Plz tell me how to bypass variables in a loop?
int a1 = 5;
int a2 = 6;
int a3 = 7;
for (int i = 1; i <=3; i++)
System.out.println(a[i]);
in this case, an Uncompilable source code error is thrown. In general, it is understandable (although not very good, but this is a matter for further study)
Thank you

Answer 1

This problem has no solution.
If these were class variables, or class properties, then it would be possible through reflection.

Answer 2

Yes, there is a gap of the whole semester in sight. Open the chapter "arrays" and read

Answer 3

int[] a = new int[]{5,6,7};