Question

Consider the Automobile class:

public class Automobile {
   private String model;
   private int rating; // a number 1, 2, 3, 4, 5
   private boolean isTruck;

   public Automobile(String model, boolean isTruck) {
      this.model = model;
      this.rating = 0; // unrated
      this.isTruck = isTruck;
   }
   
   public Automobile(String model, int rating, boolean isTruck) {
      this.model = model;
      this.rating = rating;
      this.isTruck = isTruck;
   }
          
    public String getModel() {  
      return model;
   }

   public int getRating() {  
      return rating;
   }
   
   public boolean isTruck() {  
      return isTruck;
   }

   private void updateRating(int newRating) {                           
      rating = newRating;
   }
   
   public void print() {                           
      System.out.println(model + ", rating: " + rating+", is a truck? : "+isTruck);
   }
}//end class

Write a public static method named getUnratedAutomobiles. This method takes as a parameter an ArrayList called automobiles that contains Automobile objects. It returns an ArrayList that contains only the titles of all unrated Automobile objects on the automobiles ArrayList. Assume the ArrayList has size >=0.

If there are no unrated Automobiles, the method returns an empty ArrayList.

Example- after these statements execute:

    ArrayList<Automobile> automobiles = new ArrayList<Automobile>();

    automobiles.add(new Automobile("Big Yellow", 5, False));

    automobiles.add(new Automobile("Centaur", 2, True));

    automobiles.add(new Automobile("Speedster", False));

    automobiles.add(new Automobile("Slow Steady", 3, False));

    automobiles.add(new Automobile("Beast", True));

    ArrayList<String> unratedTitles = getUnratedAutomobiles(automobiles);

The ArrayList unratedTitles contains "Speedster" and “Beast” as these are unrated (have no ratings).

Write the getUnratedAutomobiles method definition below:

Answer 1

Answer:

Here is the code:

It takes the arraylist of automobile objects, then traverses the arraylist using a for loop.

If any automobile object has rating equal to 0, it's model is added to the new result arraylist.

FInally, result arraylist is returned.

Code:

public static ArrayList<String> getUnratedAutomobiles(ArrayList<Automobile> automobiles)
{
ArrayList<String> result = new ArrayList<String>();
  
for(int i=0; i<automobiles.size(); i++)
{
if(automobiles.get(i).getRating()==0)
{
result.add(automobiles.get(i).getModel());
}
}
  
return result;
}

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