```
// "static void main" must be defined in a public class.
public class Main {
public static void main(String[] args) {
// 1. Initialize
int[] a0 = new int[5];
int[] a1 = {1, 2, 3};
// 2. Get Length
System.out.println("The size of a1 is: " + a1.length);
// 3. Access Element
System.out.println("The first element is: " + a1[0]);
// 4. Iterate all Elements
System.out.print("[Version 1] The contents of a1 are:");
for (int i = 0; i < a1.length; ++i) {
System.out.print(" " + a1[i]);
}
System.out.println();
System.out.print("[Version 2] The contents of a1 are:");
for (int item: a1) {
System.out.print(" " + item);
}
System.out.println();
// 5. Modify Element
a1[0] = 4;
// 6. Sort
Arrays.sort(a1);
}
}
```
