java - Uno card draw game cant print the card to the panel -

im working on program draws card collection(deck) of uno cards. should display first card on startup, every time "next card" button pressed draws card. i'm new gui's , can't figure out i'm doing wrong. "uno" in box should display text representation of card.

package uno;  import java.awt.*; import javax.swing.*; import java.awt.event.*;  public class gameframe extends jframe { private playingcardpanel panel;     private jpanel field;     private jpanel menu;  public gameframe(){        this.setlayout(new flowlayout());        this.setsize( 300, 150);        this.settitle("uno");        this.createfieldpanel();        this.createmenupanel();        this.add(field);        this.add(menu);    }      private void createmenupanel(){       menu = new jpanel();       menu.setbounds(0,300,250,100);         jbutton drawbutton = new jbutton("next card");       drawbutton.setsize(300,200);       drawbutton.addactionlistener(new drawlistener());        menu.add(drawbutton);     }      private void createfieldpanel()     {         field = new jpanel();         field.setbounds(0,0,250,200);         panel = new playingcardpanel();         field.add(panel);     }     private class drawlistener implements actionlistener{        public void actionperformed(actionevent e){            panel.drawcard();        }    } }      package uno;  import java.awt.*; import javax.swing.*;  public class playingcardpanel extends jpanel{      private standarddeck playingdeck;     private playingcard card;      public playingcardpanel(){         this.setpreferredsize(new dimension(100,100));            playingdeck = new standarddeck();         playingdeck.shuffle();         playingdeck.drawtopcard();     }      public void drawcard(){         playingdeck.drawtopcard();     }      public void paintcomponent(graphics g){         super.paintcomponent(g);         int panelwidth = this.getwidth();         int panelheight = this.getheight();          g.drawroundrect(0, 0, panelwidth-1, panelheight-1, 10, 10);         card = playingdeck.drawtopcard();         g.drawstring(card.tostring(), 75, 75);     } }      package uno;  import uno.gameframe;  public class gameapp{      /**      * @param args      */     public static void main(string[] args)     {         gameframe aboard = new gameframe();         aboard.setvisible(true);     }  }      package uno;  public class playingcard {      private int number;      private string color;      public int getnumber() {             return number;     }      public string getcolor(){             return color;     }      public playingcard(playingcard card){             number = card.getnumber();             color = new string(card.getcolor());     }         public playingcard(int cardnumber, string cardcolor){         number = cardnumber;         color = cardcolor;            } }      package uno;  public class playingcard {      private int number;      private string color;      public int getnumber() {             return number;     }      public string getcolor(){             return color;     }      public playingcard(playingcard card){             number = card.getnumber();             color = new string(card.getcolor());     }         public playingcard(int cardnumber, string cardcolor){         number = cardnumber;         color = cardcolor;            } }      package uno;  import java.util.collections; import java.util.vector;  public class standarddeck {          protected vector<playingcard> cardsvector;          public standarddeck(){                  cardsvector = new vector<playingcard>();             string[] colors = {"blue","red","yellow","green"};             for(string color : colors){                 for(int i=1;i<=9;i++){                         cardsvector.add(new playingcard(i,color));                         cardsvector.add(new playingcard(i,color));                 }                  cardsvector.add(new playingcard(0,color));                  for(int i=-3;i<0;i++){                         cardsvector.add(new playingcard(i,color));                         cardsvector.add(new playingcard(i,color));                 }             }              for(int i=0;i<4;i++){                 cardsvector.add(new playingcard(-4,"black"));                 cardsvector.add(new playingcard(-5,"black"));             }     }      public int getsize(){             return cardsvector.size();     }      public standarddeck reset(){         standarddeck resetdeck = new standarddeck();         return resetdeck;     }      public void shuffle(){         collections.shuffle(cardsvector);     }      public playingcard drawtopcard(){             return new playingcard(cardsvector.remove(cardsvector.size()-1));     } }      package uno;  import uno.iplayingcard;  public interface ideck {    public void reset();    public void shuffle();    public iplayingcard drawtopcard(playingcard card);    }       package uno;  import uno.playingcard;  public interface iplayingcard extends comparable<playingcard>{    public string getcolor();    public string getnumber(); } 

thanks help!

it's printing uno.playingcard@56609959 -- last part of being truncated though, you're seeing "uno" @ edge of panel.

you missing tostring() implementation in playingcard class.

public void paintcomponent(graphics g) {     super.paintcomponent(g);     int panelwidth = this.getwidth();     int panelheight = this.getheight();     g.drawroundrect(0, 0, panelwidth - 1, panelheight - 1, 10, 10);     card = playingdeck.drawtopcard();     g.drawstring(card.tostring(), 75, 75);  // you're calling tostring() here... } 

since don't have implemented, it's calling default object.tostring() method. meant add playingcard class?

public string tostring() {     return ""+number; }