Question

有人能告诉我有限状态机状态下的返回语句的用途是什么吗？例如，我有一个足球运动员状态的代码：

public class ChaseBall extends State<FieldPlayer> {

    private static ChaseBall instance = new ChaseBall();

    private ChaseBall() {
    }

    //this is a singleton
    public static ChaseBall Instance() {
        return instance;
    }

    @Override
    public void Enter(FieldPlayer player) {
        player.Steering().SeekOn();
        }
    }

    @Override
    public void Execute(FieldPlayer player) {
        //if the ball is within kicking range the player changes state to KickBall.
        if (player.BallWithinKickingRange() && player.isReadyForNextKick()) {
            player.GetFSM().ChangeState(KickBall.Instance());
            return;
        }

        //if the player is the closest player to the ball then he should keep
        //chasing it
        if (player.isClosestTeamMemberToBall()) {
            player.Steering().SetTarget(player.Ball().Pos());

            return;
        }

        //if the player is not closest to the ball anymore, he should return back
        //to his home region and wait for another opportunity
        player.GetFSM().ChangeState(ReturnToHomeRegion.Instance());
    }

    @Override
    public void Exit(FieldPlayer player) {
        player.Steering().SeekOff();
    }
}

我想知道是否有人可以解释在Execute（）方法的前两个if语句中返回关键字的用途是什么？感谢

Answer 1

在这种情况下，它主要是一系列else if子句的格式化替代。它在逻辑上等同于

if (<condition>) {
    <code>
} else if (<condition>) {
    <code>
} else {
    <code>
}

有限状态机中的返回语句

1 个答案: