Defined objects as a key from Linked HashMap in Java Program

How to eliminate duplicate user defined objects as a key from Linked HashMap

package com.java2novice.linkedhashmap;

import java.util.LinkedHashMap;

import java.util.Set;

public class MyDuplicateKeyEx

{

public static void main(String a[])

{

        LinkedHashMap hm = new LinkedHashMap();

        hm.put(new Price("Banana", 20), "Banana");

        hm.put(new Price("Apple", 40), "Apple");

        hm.put(new Price("Orange", 30), "Orange");

        printMap(hm);

        Price key = new Price("Banana", 20);

        System.out.println("Adding duplicate key...");

        hm.put(key, "Grape");

        System.out.println("After adding dulicate key:");

        printMap(hm);

    }

  public static void printMap(LinkedHashMap map)

  {

        Set keys = map.keySet();

        for(Price p:keys)

        {

            System.out.println(p+"==>"+map.get(p));

        }

    }

}

class Price

{

    private String item;

    private int price;

 public Price(String itm, int pr)

{

        this.item = itm;

        this.price = pr;

  }

 public int hashCode()

{

        int hashcode = 0;

        hashcode = price*20;

        hashcode += item.hashCode();

        return hashcode;

    }

  public boolean equals(Object obj)

  {

        if (obj instanceof Price)

         {

            Price pp = (Price) obj;

            return (pp.item.equals(this.item) && pp.price == this.price);

    }

         else

        {

            return false;

        }

    }

public String getItem()

{

        return item;

 }

 public void setItem(String item)

{

        this.item = item;

 }

 public int getPrice()

 {

        return price;

  }

   public void setPrice(int price)

   {

        this.price = price;

    }

   public String toString()

  {

        return "item: "+item+"  price: "+price;

    }

}

How to find user defined objects as a key from Linked HashMap

package com.java2novice.linkedhashmap;

import java.util.LinkedHashMap;

import java.util.Set;

public class MyObjectKeySearch

{

public static void main(String a[])

{

        LinkedHashMap hm = new LinkedHashMap();

        hm.put(new Price("Banana", 20), "Banana");

        hm.put(new Price("Apple", 40), "Apple");

        hm.put(new Price("Orange", 30), "Orange");

        printMap(hm);

        Price key = new Price("Banana", 20);

        System.out.println("Does key available? "+hm.containsKey(key));

  }

 public static void printMap(LinkedHashMap map)

{ 

        Set keys = map.keySet();

        for(Price p:keys)

        {

            System.out.println(p+"==>"+map.get(p));

        }

    }

}

class Price

{

     

    private String item;

    private int price;

 public Price(String itm, int pr)

{

        this.item = itm;

        this.price = pr;

  }

 public int hashCode()

{

        System.out.println("In hashcode");

        int hashcode = 0;

        hashcode = price*20;

        hashcode += item.hashCode();

        return hashcode;

    }

  public boolean equals(Object obj)

 {

        System.out.println("In equals");

        if (obj instanceof Price)

        {

            Price pp = (Price) obj;

            return (pp.item.equals(this.item) && pp.price == this.price);

        }

        else

        {

            return false;

        }

    }

public String getItem()

{

        return item;

 }

public void setItem(String item)

{

        this.item = item;

 }

public int getPrice()

{

        return price;

    }

  public void setPrice(int price)

  {

        this.price = price;

    }

   public String toString()

   {

        return "item: "+item+"  price: "+price;

    }

}