packagetemplate; importjava.util.*; public classtemplates6Main { /** * @param ar

Question

packagetemplate;

importjava.util.*;

public classtemplates6Main
{

    /**
     * @param args the command linearguments
     */
    public static void main(String[] args)
    {
       // System.out.println( min(newProduct(4, "de"), new Product(3, "bc")));
         
        ArrayList<Product> pl2 = newArrayList<Product>();
        pl2.add(new Product(1,"P1"));
        pl2.add(new Product(2,"C2"));
        pl2.add(new Product(4,"Kingdom"));
        pl2.add(new Product(1,"B1"));
       System.out.println(sort(pl2));
       
        ArrayList<Product>pl1 = new ArrayList<Product>();
        pl1.add(new Product(1,"P1"));
        pl1.add(new Product(2,"P2"));
        pl1.add(new Product(4,"Kingdom"));
        pl1.add(new Product(1,"P1"));
       System.out.println(duplicate(pl1));
    }
    public static < T extends Comparable > Tsort(List<T> col)
    {
        int count;
       for(T i1 : col)
       {
           count= 0;
           for(Ti2 : col)
           {
              if(i1.compareTo(i2) < 0)
                  count++;
           }
          if(count > 1)
              return true;
        }
       return false;
    }
    public static < T > booleanduplicate(List< T > coll)
    {
       int count;
       for(T i1 : coll)
       {
           count= 0;
           for(Ti2 : coll)
           {
              /**
               * it compares references so equals() has been defined in productclass
               */
              if(i1.equals(i2))
                  count++;
           }
          if(count > 1)
              return true;
       }
       return false;
    }
}
class Product implements Comparable
{
    private int id;
    private String name;

    publicProduct(int i, String n)
    {
        name = n;
        id = i;
    }
    public void display()
    {
        System.out.println(id +"" +name);
    }
    public String toString()
    {
        return id+" "+name;
    }
    public int compareTo(Object o)
    {
        returnname.compareTo(name);
    }
    public boolean equals(Object obj)
    {
        Product p2 =(Product)obj;
        returnname.equals(p2.name);
    }
    public int hashCode()
    {
        int hash = 5;
        hash = 11*hash+id;
        hash = 11*hash +(name !=null ? name.hashCode(): 0);
        return hash;
    }
}

Explanation / Answer

YourcompareTo() iscurrently: public int compareTo(Objecto) { returnname.compareTo(name); } It should be: public intcompareTo(Object o) { returnname.compareTo(((Product)o).name); } I'm also not sure what your sort() method is doing, because I don't see anyswaps. public staticvoid sort(Listlist) { for(int i = 0; i

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.