Killer game programming in java..... JumpingJack

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In this book, there´s method.

private int findFloor(int xSprite) {

int xMap = (int) (xSprite/imWidth); //  X - axis Index
int locy   = pHeight;

ArrayList column = columnBricks[xMap];

Brick b;

for(int i = 0; i < column.size(); i++) {
   
    if(b.getLocY() < locy) {
         locy = b.getLocY(); // create a column above

    }
}
return locy;
}
 

xSprite = x - Axis of Sprite
pHeight = size of JPanel
columnBricks = ArrayList
Brick b = Object whot the contructor hs 3 arguments x-Axis, y - Axis and ImgeID
getLocY() = the y - coordinate of Bricks or floor.
imWidth = width of the each brick image, width of the each Imge of the floor.

In other class I get this method:

locy = brickman.findFloor(locx + getWidth()/2) - getHeight();

locx = location of the image of sprite onte the x axis.
getWidth() = the width of the Imge of Sprite
getHeight() = the height of the Image of sprite.

sprite = jack or the player.

My doubt of theses codes is I can´t see the location of Spriye above of the floor like he is stepping on the floor.
I just see the location on the x - coordinte and the create the column of Brick in each x - axis. Somebody can help me???

Page 330 of this book..... Killer game programming in java.