Java Using Defined objects as a key from HashMap Program

How to find user defined objects as a key from HashMap

package com.java2novice.hashmap;

import java.util.HashMap;

import java.util.Set;

public class MyObjectKeySearch

{

public static void main(String a[])

{

        HashMap hm = new HashMap();

        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(HashMap 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;

    }

}

How to delete user defined objects as a key from HashMap

package com.java2novice.hashmap;

import java.util.HashMap;

import java.util.Set;

public class MyDeleteKeyObject

{

public static void main(String a[])

{

        HashMap hm = new HashMap();

        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("Deleting key...");

        hm.remove(key);

        System.out.println("After deleting key:");

        printMap(hm);

 }

public static void printMap(HashMap 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;

    }

 }