为什么java代码里有main函数，运行时却说没有main函数，附上代码，没有提示错误，但不能运行！急求答案！

package thirtynine;

public class GuessGame {
Player p1;
Player p2;
Player p3;
public void start(){

p1=new Player();
p2=new Player();
p3=new Player();
int guessp1=0;
int guessp2=0;
int guessp3=0;
boolean p1isright=false;
boolean p2isright=false;
boolean p3isright=false;
int targetNumber=(int) (Math.random()*10);
System.out.println("im thinking of a number between 0 and 9...");
while(true){
System.out.println("Number to guess is"+targetNumber);
p1.guess();
p2.guess();
p3.guess();
guessp1=p1.number;
System.out.println("Player one guessed"+guessp1);
guessp2=p2.number;
System.out.println("Player two guessed"+guessp2);
guessp3=p3.number;
System.out.println("Player three guessed"+guessp3);
if(guessp1==targetNumber){
p1isright=true;
}
if(guessp2==targetNumber){
p2isright=true;
}
if(guessp3==targetNumber){
p3isright=true;
}
if(p1isright||p2isright||p3isright){
System.out.println("we hava a winner!");
System.out.println("Player one got it right?"+p1isright);
System.out.println("Player two got it right?"+p2isright);
System.out.println("Player three got it right?"+p1isright);
System.out.println("Game is over");
break;
}
else{
System.out.println("Players will hava try again");
}
}
}

public class Player {
int number=0;
public void guess(){
number=(int)(Math.random()*10);
System.out.println("im guessing"+number);
}
}

public class GameLauncher{
public void main(String[] args){
GuessGame game=new GuessGame();
game.start();
}

}
}

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