java.lang.NullPointerException in the Deck class -

    public class deck {         public static final int cardsofdeck = 112;         private card[] cards = new card[cardsofdeck];              public static void main(string[] args){                 deck deck = new deck();                 deck.load();                 deck.show();         }         public void show(){             for(card c: cards)                 system.out.println(c.tostring());         }         public void load(){             int j = 0;             (j = 0; j < 2; j++) {                 int = 0;                 (color c : color.values()) {                     (value v : value.values())                         cards[i++] = new card(c, v);                 }              }          }     }       public class card {          private color color;          private value value;            public card(color c, value v) {             color = c;             value = v;         }                public string tostring() {                 return color + " " + value;             }         } public enum color {       red("red"), yellow("yellow"), blue("blue"), green("green");        private final string cardcolor;        private color(string cardcolor){         this.cardcolor = cardcolor;       }        public string getcolor(){         return cardcolor;       } }    public enum value {       zero(0), one(1), two(2), three(3), four(4), five(5), six(6), seven(7), eight(8), nine(9),       skip(10), draw2(11), reverse(12), wild(13), wilddraw4(14);        private final int cardvalue;        private value(int cardvalue){         this.cardvalue = cardvalue;       }        public int getvalue(){         return cardvalue;        } } 

i getting nullpointerexception in deck class around says tostring halfway down, , not sure why. making uno game java based class , trying cards created. thank help!

in code below

public void load(){   int j = 0;   (j = 0; j < 2; j++) {     int = 0;     (color c : color.values()) {       (value v : value.values())         cards[i++] = new card(c, v);     }   } } 

you reset i 0 within j loop. intend (i assume) declare 0 outside loop in order make 2 copies of each card. that, change below:

public void load(){   int j = 0;   int = 0;   (j = 0; j < 2; j++) {     (color c : color.values()) {       (value v : value.values())         cards[i++] = new card(c, v);     }   } } 

just side note, think want have 120 cards, not 112. 15 card types * 4 colors * 2 of each card = 120.