Pls explain the array part in the main method from the declaration of object what has he done Where's the object declaration

Question

interface calculate
{
int VAR = 0;
void cal(int item);
}
class display implements calculate
{
int x;
public void cal(int item)
{
if (item<2)
x = VAR;
else
x = item * item;
}
}
class interfaces
{

public static void main(String args[])
{
display[] arr=new display[3];

for(int i=0;i<3;i++)
arr[i]=new display();
arr[0].cal(0);
arr[1].cal(1);
arr[2].cal(2);
System.out.print(arr[0].x+" " + arr[1].x + " " + arr[2].x);
}
}

Answer 1

display[] arr=new display[3];

This creates an array to hold display objects of length 3.

for(int i=0; i < 3;i++)
arr[i]=new display();

This loop fills the array with instantiated display objects.

The next 3 lines;
arr[0].cal(0);
arr[1].cal(1);
arr[2].cal(2);
Calls the cal() method of each of those 3 display objects passing in the corresponding number as an argument. This will effectively set the value of x for each object.

Then x is output for each of the display objects.