Basically I made this programm where the computer generates a random card. I made a class called 'rndnumber', this class generates the random number. I then made another class called 'rndsuits', and this generates the random suit.
Problem is when I go to my main class, and execute the code, im getting null instead of numbers and suits. Anyone know why? My output is basically:
Here is your random card: null of null.

```
public class maincard { 

public static void main(String[] args){

    System.out.println("Here is your random card");

    rndnumber h = new rndnumber();
    rndsuit a = new rndsuit();

    System.out.println(h.getString() + " of " + a.getStringz());

}

}

public class rndnumber {

private int rndnumber = (int) (Math.random()*13+1);
private String number;

public String getString(){
    return number;
}

public void rnd(){
    switch (rndnumber){
    case 1:
        number = "Ace";
        break;
    case 2:
        number = "2";
        break;
    case 3:
        number = "3";
        break;
    case 4:
        number = "4";
        break;
    case 5:
        number = "5";
        break;
    case 6:
        number = "6";
        break;
    case 7:
        number = "7";
        break;
    case 8:
        number = "8";
        break;
    case 9:
        number = "9";
        break;
    case 10:
        number = "10";
        break;
    case 11:
        number = "Jacks";
        break;
    case 12:
        number = "Queens";
        break;
    case 13:
        number = "Kings";
        break;
    }

}   
}

public class rndsuit {

private int y = (int) (Math.random()*3+1);
private String rndsuit;

public String getStringz(){
return rndsuit;
}

public void suit(){
    switch(y){
    case 1:
        rndsuit = "Spades";
        break;
    case 2:
        rndsuit = "Cloves";
        break;
    case 3:
        rndsuit = "Hearts";
        break;
    case 4:
        rndsuit = "Diamonds";
        break;
    }
}
}

```