[Solved] BookOrder class isn’t rendering results in Test

Because you are not initializing any thing in your constructor so it takes default value for all variable in you class. So you can change your constructor like :

private String author;      
private String title;
private int quantity;
private double costPerBook;
private String orderDate;
private double weight;
private char type;      //R,O,F,U,N

public BookOrder(String author, String title, int quanitity, double costPerBook, String orderDate, double weight, char type)
{
  this.author = author; 
  this.title =title;
  this.quanitity =quanitity;

  // others also
}