Question

So, I have this class:

public class Product  {
 private String name, id, info ;
 private int quantity;

 public Product(String newName, String newID, String newInfo, Integer newQuantity){
  setName(newName);
  setID(newID);
  setPrice(newInfo);
  setQuantity(newQuantity);}

 public void setName(String name) {
  this.name = name;  }

 public void setID(String id) {
  this.id = id;  }

 public void setPrice(String info) {
  this.info = info;  }

 public void setQuantity(Integer quantity) {
  this.quantity = quantity;   }

 public String getID( ) { 
    return id;  }

 public String getName( ) { 
  return name;   }

 public String getInfo( ) { 
  return info; }

 public int getQuantity( ) { 
  return quantity;  }

In another class i have this:

 public class Invoice implements Group<Product> {
   private HashMap<String, Product> prod = new HashMap<String, Product>( );

  public Invoice(){ } 
   public void addProd(Product a) {

      prod.put(??getID()??,new Product(??));
   }  
}

If this data was user generated rather than me, I would use the getID() method right?
So in my class invoice, how do i use the method getID(), so that I can use it in the parameter for my key value in the HashMap? Also is there a way to add 3 values (name info quan) to the hashmap without making a new class?

Answer 1

I see that you get Product object with ref “a” as parameter to your addProd method.

And you can get id by just using a.getID(). It should look as:

  public void addProd(Product a) {

      prod.put(a.getID(),a);
  }  

I didn’t understand second part of your question.. I think you already have 3 values in your Product object and you put Product object to Map, So why do you require another way ?