Dart 初始化和 final、final late

问：

嗨，开发人员！我正在使用 Dart 进行颤动。我试图弄清楚为什么下面的代码不需要“late”或“final”作为其变量。我知道这些术语的含义，但我对代码实际启动或“初始化”的时间和地点感到困惑。

有人可以帮我分解一下或给我一些例子吗？我真的很感激！

谢谢！

`

class Player {
   final String name;
   String mode; 
//`why we do not need late final or late here? `
   int xp;
   int level;
  
  Player(this.name, this.mode, this.xp, this.level); 

// as we declare variables with **'this'** , we initialized variable? 


  
  void playGame() {
    print("You choose $name, $mode. detail: xp = $xp, play level = $level",);
  }

}


void main() {
  var player = Player("King99", "Wizard",1000, 1); 
`// or initialization happened here?`
  player.playGame();
  var player2 = Player("Queen11", "Wizard", 5000, 3);
  player2.playGame();

}