class - Java Program (Coin Flip simulation) -

this code fliprace program initiates race between 2 coins. goal globally declared variable. whichever coin reaches goal number of heads fastest wins. below code coin class.

my problem if put goal = 3 , whichever coin gets 3 heads fastest wins, works ok. when set goal = 4 , still works ok. weird starts happening once put goal > 4. put goal = 7, still final result comes when 1 coin has registered 4 heads not 7.

// fliprace.java package nisarg;  public class fliprace {     public static void main(string[] args){         final int goal = 6;         int count1=0,count2=0;         coin mycoin1 = new coin();         coin mycoin2 = new coin();         while(count1 < goal && count2 < goal){             mycoin1.flip();             mycoin2.flip();             system.out.print("coin1 : " +mycoin1 +"\t");             system.out.println("coin2 :"+mycoin2);             count1 = (mycoin1.isheads())? count1+1 : 0;             count2 = (mycoin2.isheads())? count2+1 : 0;         }         if(count2 < goal) {             system.out.println("coin1 wins!!");         }   else if(count1 < goal){                 system.out.println("coin2 wins!!");         }         else {             system.out.println("its tie!!");         }     } }  // coin.java package nisarg; import java.util.random;  public class coin {     private final int heads = 1;     private final int tails = 0;     private int face;      public coin(){         flip();     }     public void flip(){         face = (int)(math.random()*2);      }     public boolean isheads(){         return(face == heads);     }     public string tostring(){         string facename;         if(face == heads){             facename = "h";         }         else {             facename = "t";         }         return facename;     } }