problemi z javo

Dober dan pišem vam ker imam probleme z java programiranjem...naredil sem program ki bi moral delat ampak iz nekega razloga ne dela pa me zanima če mi kdo ve povedat zakaj...naredil sem class stock...v glavnem programu sem naredil 2 stocka(s1,s2) jo enačil(z equals) vendar mi vedno napiše da sta "diferent" moralo pa bi pisat da sta "same"

class stock

package javap35.stockcompare;


public class stock {
    
    private String symb;
    private double Price;
    
    public stock(String s,double p)
    {
        symb=s;
        Price=p;
    }
    public String getSymbol()
    {
        return symb;
    }
    public double getPrice()
    {
        return Price;
    }
    @Override
    public String toString()
    {
        String str="trading symbol: "+symb+
                "\nShare price "+Price;
        return str;
    }
    
}

glavni "main" program

public class JavaP35StockCompare {

    
    public static void main(String[] args) {
       
        stock s1=new stock("XYZ",9.66);
        stock s2=new stock("XYZ",9.66);
        
        System.out.println(s1);
        System.out.println(s2);
          
        if(s1.equals(s2))
        {
            System.out.print("stock are same");
            System.out.print("good");
            
        }
        else
        {
            System.out.print("stock are te diferent\n");
            System.out.print("bad");
        }
    
    }
    
}

Kdaj pa sta dva objekta razreda stock enaka? Kako naj program to ve? Kaj dela metoda equals razreda Object? Zakaj si overridal metodo toString, če pa že obstaja v razredu Object?

Modificiran sample, če ti bo kaj v pomoč...

public class Main {

    public static class stock {

        private String Symbol;
        private double Price;

        stock(String s, double p)
        {
            this.Symbol = s;
            this.Price = p;
        }

        String printAll()
        {
            return "SYM=" + this.Symbol + "|price=" + this.Price;
        }

        int compare(stock ss){
            int eq = 0;
            if (this.Symbol.equals(ss.Symbol)) {
                eq += 1;
            }
            if (this.Price == ss.Price) {
                eq += 2;
            }
            return eq;
        }
    }

    public static void main(String[] args) {

        stock s1 = new stock("XYZa",9.66);
        stock s2 = new stock("XYZ",9.66);

        System.out.print("\n");
        System.out.print(s1.printAll() + "\n");
        System.out.print(s2.printAll() + "\n");
        System.out.print("\n");

        if(s1.compare(s2) == 0) {
            System.out.print("Stock symbols AND prices are different\n");
            System.out.print(s1.Symbol + " != " + s2.Symbol + "\n");
            System.out.print(s1.Price + " != " + s2.Price + "\n");
        }
        else if (s1.compare(s2) == 1) {
            System.out.print("Stock symbols are the same but prices are different\n");
            System.out.print(s1.Symbol + " == " + s2.Symbol + "\n");
            System.out.print(s1.Price + " != " + s2.Price + "\n");
        }
        else if (s1.compare(s2) == 2) {
            System.out.print("Stock symbols are different but prices are the same\n");
            System.out.print(s1.Symbol + " != " + s2.Symbol + "\n");
            System.out.print(s1.Price + " == " + s2.Price + "\n");
        }
        else if (s1.compare(s2) == 3) {
            System.out.print("Stock symbols AND prices are the same\n");
            System.out.print(s1.Symbol + " == " + s2.Symbol + "\n");
            System.out.print(s1.Price + " == " + s2.Price + "\n");
        }
    }
}

kretze je 17. sep 2019 ob 18:09 izjavil:

Dober dan pišem vam ker imam probleme z java programiranjem...naredil sem program ki bi moral delat ampak iz nekega razloga ne dela pa me zanima če mi kdo ve povedat zakaj...naredil sem class stock...v glavnem programu sem naredil 2 stocka(s1,s2) jo enačil(z equals) vendar mi vedno napiše da sta "diferent" moralo pa bi pisat da sta "same"

To kliče tole metodo (iz Object.java):

 public boolean equals(Object obj) {
        return (this == obj);
    }

Če še vedno ni razumljivo zakaj ne dela po pričakovanju, vprašaj.