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Java program to implement hashcode and equals

  • Students Tutorial
   

FarToCel.java

import java.io.BufferedOutputStream;
import java.util.HashMap;
 
public class HashcodeEqual {
 
    public static void main(String a[]){
         
        HashMap<Price, String> h1 = new HashMap<Price, String>();
        h1.put(new Price("shirt", 20), "shirt");
        h1.put(new Price("jeans", 40), "jeans");
        h1.put(new Price("shoes", 30), "shoes");
       
        Price key = new Price("shirt", 20);
        System.out.println("Hashcode of the key: "+key.hashCode());
        System.out.println("Value from map: "+h1.get(key));
    }
}
 
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;
    }
}

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