my session created by rymate1234 - https://repl.it/FvL2/3

Main.java

class Main {
  public static void main(String[] args) {
    System.out.println("hello world");
    
    Triangle lab = new Triangle("simple", 3, 4);
    System.out.println(lab);
    lab.printStyle();
  }
}

Triangle.java

public class Triangle extends TwoDShapeForLab {
  private String style;
  public Triangle(String style, double width, double length) {
    super(width, length);
    
    this.style = style;
  }
  
  public double area()
  {
    return (getWidth() * getLength()) / 2;
  }
  
  public String getStyle()
  {
    return style;
  }
  
  public void printStyle()
  {
    System.out.println(getStyle());
  }
  
  
}

TwoDShapeForLab.java

/**
 * Write a description of class TwoDShapeForLab here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class TwoDShapeForLab
{
    private double width;
    private double length;
        
    /**
     * Parameterized constructor for TwoDShapeForLab
     * 
     * @param width the shape's width
     * @param length the shape's length
     */
    public TwoDShapeForLab(double width, double length)
    {
        this.width = width;
        this.length = length;
    }
      
    /**
     * Get the shape's width
     * 
     * @return the width
     */
    public double getWidth()
    {
        return width;
    }
    
    /**
     * Get the shape's length
     * 
     * @return the length
     */
    public double getLength()
    {
        return length;
    }
    
    public String toString()
    {
        return "Width and length are " + width + " and " + length;
    }
}