How do I compare two return values from my method? Because when I'm doing this in my code and I'm expecting the return values to be the same, they are comparing as different. Here is my code:

public static void Card_Initialization(){

    Red_Dog c1 = new Red_Dog();
    Red_Dog c2 = new Red_Dog();
    Cards_Match(c1);
    System.out.println(card_num+card_suit);
    Cards_Match(c2);
    System.out.println(card_num+card_suit);
    System.out.println(Cards_Match(c1) == Cards_Match(c2));//to check really if it is equal
}

public static int Cards_Match(Red_Dog rd){
     card = (int)(Math.random() * deck.length); 
     if(card >= 0 && card <=3)
     {
        card_num = cards[0];
     }
     else if(card >= 4 && card <=7)
     {
        card_num = cards[1];
     }
     else if(card >= 8 && card <=11)
     {
        card_num = cards[2];
     }
     else if(card >= 12 && card <=15)
     {
        card_num = cards[3];
     }
     else if(card >= 16 && card <=19)
     {
        card_num = cards[4];
     }
     else if(card >= 20 && card <=23)
     {
        card_num = cards[5];
     }
     else if(card >= 24 && card <=27)
     {
        card_num = cards[6];
     }
     else if(card >= 28 && card <=31)
     {
        card_num = cards[7];
     }
     else if(card >= 32 && card <=35)
     {
        card_num = cards[8];
     }
     else if(card >= 36 && card <=39)
     {
        card_num = cards[9];
     }
     else if(card >= 40 && card <=43)
     {
        card_num = cards[10];
     }
     else if(card >= 44 && card <=47)
     {
        card_num = cards[11];
     }
     else if(card >= 48 && card <=51)
     {
        card_num = cards[12];
     }

     if(card % 4 == 0)
     {
        card_suit = suits[0];
     }

     else if(card % 4 == 1)
     {
        card_suit = suits[1];
     }

     else if(card % 4 == 2)
     {
        card_suit = suits[2];
     }

     else if(card % 4 == 3)
     {
        card_suit = suits[3];
     }

     return card;   
}

Result: 1st run:

AceSpades AceSpades false

2nd run:

AceSpades AceSpades true