The following classes are used to represent a Block and a Row, which is a group of Block objects. A Block is a very simple structure that has a width and a height, A Row is a collection of Blocks that is built using B$1$ock.

The Block class has the following methods that you can use

publie class B$1$ock

$1$

$//1$nstance variables not shown

public Block $()(\text{'}//$ code not shown

public int getwidth$()$ I $//$eode not shown

public int getheight$)(($f$/$code not shown$)$

public void setwidth $($ int wideh$)(//$code not shown $,$

public void setHeight int helght if $(/$code not shown$)$

$//$other methods not shown

$1$

public class Row

$1$

private Arraylist$\frac{\frac{?}{?}}{?}||$