My code is complete but I am getting this error cansomeone please help me

Main.java:44: error: non-static variable this cannot bereferenced from a static context

shapes.add(newRectangle(name, length, width));

I believe the project3 class is not recognizing my shapeclasses. I think it's because the classes have to be publicstatic?

Here is my code:

import java.io.File;

import java.io.FileNotFoundException;

import java.util.ArrayList;

import java.util.Scanner;

public class Project3 {

public static void main(String[] args) {

// If file name is not provided ascommand line argument then print message and

if (args.length < 1) {

System.out.println("Providefile name which contains details about shape");

return;

}

//ArrayList to store shapes

ArrayList shapes = newArrayList();

// Get file name from command lineargument

String filename = args[0];

// Declare and initialize fileobject

File file = new File(filename);

try {

// Declare and initializescanner object

Scanner fileScanner = newScanner(file);

fileScanner.useDelimiter("[,]+");

while(fileScanner.hasNextLine()) {

// Read type andname of the shape

String type =fileScanner.next();

String name =fileScanner.next();

//if type is aRectangle

if(type.equalsIgnoreCase("Rectangle")) {

doublewidth = fileScanner.nextDouble();

doublelength = fileScanner.nextDouble();

//Store Shape in an ArrayList.

shapes.add(newRectangle(name, length, width));

}

// if type is aSquare

else if(type.equalsIgnoreCase("Square")) {

doubleside = fileScanner.nextDouble();

//Store Shape in an ArrayList.

shapes.add(newSquare(name, side));

}

// if type is aTriangle

else if(type.equalsIgnoreCase("Triangle")) {

doublebase = fileScanner.nextDouble();

doubleheight = fileScanner.nextDouble();

//Store Shape in an ArrayList.

shapes.add(newTriangle(name, base, height));

}

// if type is aCircle

else if(type.equalsIgnoreCase("Circle")) {

//Read radius as double

doubleradius = fileScanner.nextDouble();

//Store Shape in an ArrayList.

shapes.add(newCircle(name, radius));

}

if(fileScanner.hasNextLine())

fileScanner.nextLine();

}

// close file scannerobject

fileScanner.close();

} catch (FileNotFoundException ex) {

System.out.println("File notfound");

}

// Print shapes in the ArrayList

System.out.println("Shapes in theArrayList are:");

// Iterate through each shape

for (Shape shape : shapes) {

System.out.println(shape);

}

// Print Cumulative Area of shapes

System.out.printf("Cumulative Area ofshapes in the ArrayList is: %.2f",getCumulativeArea(shapes));

// Print Largest shape

System.out.println("Largest shape inthe ArrayList is: " + getLargestShape(shapes));

}

//This method returns a double representing thetotal area of all the shapes

public static doublegetCumulativeArea(ArrayList shapes) {

double totalArea = 0.0;

// Iterate through each shape in theArrayList

for (Shape shape : shapes) {

totalArea +=shape.getArea();

}

return totalArea;

}

//This method returns the name of the shape whichhas the largest area

public static ShapegetLargestShape(ArrayList shapes) {

Shape largest = null;

for (Shape shape : shapes) {

// If largest shape is nullor area of current shape is greater than largest

// shape then update largestshape

if (largest == null ||largest.getArea() < shape.getArea())

largest =shape;

}

return largest;

}

public abstract class Shape {

// Attribute for name of the shape

private String name;

public Shape(String name) {

this.name = name;

}

public String getName() {

return name;

}

public abstract double getArea();

}

public static class Rectangle extends Shape {

private double length, width;

public Rectangle(String name, double length, doublewidth) {

super(name);

this.length = length;

this.width = width;

}

//Getters

// return the length

public double getLength() {

return length;

}

//return the width

public double getWidth() {

return width;

}

//Overrided getArea() method

@Override

public double getArea() {

return length * width;

}

@Override

public String toString() {

return String.format("A Rectangle named%s with length %.2f, width %.2f and area %.2f.", getName(), length,width, getArea());

}

}

public static class Square extends Rectangle {

//A parameterized constructor to initialize Squareclass.

public Square(String name, double side) {

super(name, side, side);

}

@Override

public double getArea() {//get method

return getLength() * getLength();

}

@Override

public String toString() {

return String.format("A Square named %swith side %.2f and area %.2f.", getName(), getLength(),getArea());

}

}

public static class Circle extends Shape {

private double radius;

public Circle(String name, double radius) {

super(name);

this.radius = radius;

}

//Getters

//return the radius

public double getRadius() {

return radius;

}

//Overrided getArea() method

@Override

public double getArea() {

return Math.PI*radius*radius;

}

@Override

public String toString() {

return String.format("A Circle named %swith radius %.2f and area %.2f",getName(), radius, getArea());

}

}

public static class Triangle extends Shape {

private double base, height;

public Triangle(String name, double base, doubleheight) {

super(name);

this.base = base;

this.height = height;

}

//Getters

// returns base

public double getBase() {

return base;

}

//returns height

public double getHeight() {

return height;

}

//calculates area of triangle and returns it

@Override

public double getArea() {

return 0.5 * base * height;

}

//prints info for triangle

@Override

public String toString() {

return String.format("A Triangle named%s with base %.2f, height %.2f and area %.2f", getName(), base,height,getArea());

}

}

}