Anyone can explain how dose it work briefly.

Question

public class Program
{
public static void main(String[] args) {
int[] a = {1,2,3,4,1};
for(int n:a)
{
a[n] = 0;
System.out.println(n);
}
}
}
O/p:
1
0
3
0
1

Answer 1

It's changing the elements of the array:
a[1] = 0
Outputs n -> 1
a[2] = 0
Outputs n -> 0 ( set in the previous step)
a[3] = 0
Outputs n -> 3
a[4] = 0
Outputs n -> 0 ( set in the previous step)
a[1] = 0
Outputs n -> 1.

Answer 2

Krishnanshu Dey , you are welcome 😉

Answer 3

Yaa I got it thanks