Please show the Java code for this problem

Problem $1$: TextCanvas

$100$ pts

Implement a TextCanvas class in chapter$10.$canvas package. The TextCanvas class should implement Canvas package as provided in the assignment.

package chapter$10.$canvas;

$/**$

$*$ The implementing class should have a constructor with two parameters

$*$ width: the width of the canvas.

$*$ height: the height of the canvas.

$*$

$*$ The valid locations for each pixels are from $[0..$height$-1][0..$width$-1]$

$*$

$*/$

public interface Canvas $\{$

$/**$

$*$ returns the height of the canvas.

$*/$

int getHeight$()$;

$/**$

$*$ returns the width of the canvas.

$*/$

int getWidth$()$;

$/**$

$*$ @param an rectangle area to be added to the canvas

$*$ returns the id of the rectangle in the canvas. The id of the

$*$ rectangle is a unique integer for a rectangle in the canvas, and

$*$ id will not be reused$($after the deletion of a rectangle$).$

$*$

$*$ If the coordinates are not valid or out of the bounds for the canvas,

$*$ returns $-1.$

$*/$

int add$($int leftX, int upperY, int rightX, int bottomY$)$;

$/**$

$*$ removes the rectangle identified by the id from the canvas.

$*/$

int remove$($int id$)$;

$/**$

$*$ moves the rectangle identified by id to the right by xOff and down by yOff.

$*$ If the move attempt to move the rectangle out of bounds of the canvas,

$*$ the rectangle will stop at the boundary.

$*$

$*$ If xOff is a negative number, move to the left by $|$xOff$|.$

$*$ If yOff is a negative number, move up by $|$yOff$|,$

$*/$

int move$($int id$,$ int xOff, int yOff$)$;

$/**$

$*$ returns the total shaded area on this canvas.

$*/$

int getShadedArea$()$;

$/**$

$*$ displays the convas. Each pixel on the canvas will be displayed as a

$*$ blank if it is not covered by any rectangles, and will be displayed as

$*$ a star if it is covered by one or more rectangles.

$*/$

void draw$()$;

$\}$

import chapter$10.$canvas.Canvas;

import chapter$10.$canvas.TextCanvas;

public class TextCanvasTest $\{$

public static void main$($String$[]$ args$)\{$

Canvas canvas $=$ new TextCanvas$(30,20)$;

int r$1=$ canvas.add$(0,6,6,9)$;

int r$2=$ canvas.add$(4,4,8,8)$;

canvas.draw$()$;

System.out.println$($canvas$.$getShadedArea$())$;

canvas.remove$($r$1)$;

canvas.move$($r$2,-5,-2)$;

canvas.draw$()$;

$//$ this rectangle is out of bound, and will not be added

canvas.add$(0,2,30,20)$;

System.out.println$($canvas$.$getShadedArea$())$;

canvas.draw$()$;

$\}$

$\}$