import java.util.Arrays;
public class showArrayDeclarations {
	
	private Loc[] l1;
	private Loc[]  l2 = new Loc[10];
	
	public class Loc {
		int x;
	}
	public static void main (String[] args) {
		showArrayDeclarations sa = new showArrayDeclarations();
		
		//The following statement creates an array of type Location
		//Each entry in the array is set to null
		sa.l1 = new Loc[10];
		System.out.println(Arrays.toString (sa.l1));
		
		//If I wanted to fill the array with actual Location objects
		//I need to do the following:
		for (int i=0; i<10; i++)
			sa.l1[i] = sa.new Loc();
		
		//If I want to set an individual element to a Loc object,
		//I can do the following  (note:  the sa.new is  necessary
		//because I defined Loc as a class within a class.  If
		//Loc was in a separate file, only new be necessary):
		Loc l = sa.new Loc();
		sa.l2[0] = l;
		
		//Now, both locations point to the same object:
		System.out.println ("\n" + l + "    " + sa.l2[0]);
		
		//If I set an instance variable in the object, both references will 
		//see the change
		l.x = 0;
		System.out.println ("\nInitially, l2[0] = " + sa.l2[0].x);
		l.x = 20;
		System.out.println ("I've set l, l2[0] = " + sa.l2[0].x);
		
	}
}