“嵌套类型不能隐藏封闭类型”类 - Java 处理

Question

我收到此错误：The nested type cannot hide an enclosing type。我查了一下，其他人似乎两次宣布他们的班级，我不是。

奇怪的是，如果我将代码复制并粘贴到新的处理文档中，它可以正常工作。但是当我将它转换为 js 时，我需要它在保存并再次打开后正常工作。

MotorBike Bike1, Bike2, Bike3, Bike4, Bike5, Bike6, Bike7, Bike8, Bike9;
int Score_Bike1 = 0;
int Score_Bike2 = 0;
int Score_Bike3 = 0;
int Score_Bike4 = 0;
int Score_Bike5 = 0;
int Score_Bike6 = 0;
int Score_Bike7 = 0;
int Score_Bike8 = 0;
int Score_Bike9 = 0;
String Score_Spacing = "        ";
int GameState = 0;


class MotorBike {
float Pos_X;
int Pos_Y;
float Speed;
int Size = 30;
float WheelSize = Size / 3;
color Color;


MotorBike(int Declare_X, int Declare_Y, int Declare_Speed, color Declare_Color)                                                                                                    
{
this.Pos_X = Declare_X;
this.Pos_Y = Declare_Y;
Speed = Declare_Speed;
Color = Declare_Color;
}

void move()
{
if (GameState == 1) {
  Speed = (random(0, 50) / 10);
  Pos_X = Pos_X + Speed;
}
}

void render()
{
fill(Color);
triangle(Pos_X, Pos_Y, Pos_X + Size, Pos_Y, Pos_X + Size / 2, Pos_Y -Size /      2);
fill(255);
strokeWeight(1.5);
ellipse(Pos_X, Pos_Y, WheelSize, WheelSize);
ellipse(Pos_X + Size, Pos_Y, WheelSize, WheelSize);
}
}

void setup()
{
size(700, 600);
background(200);
SpawnBikes();
}

void draw()
{
background(200);
strokeWeight(3);
line(50, 10, 50, 590);
line(650, 10, 650, 590);
strokeWeight(1);
MoveBikes(); 
DetectWinner();
DisplayScore();
}

void MoveBikes()
{
Bike1.render();
Bike1.move();
Bike2.render();
Bike2.move();
Bike3.render();
Bike3.move();
Bike4.render();
Bike4.move();
Bike5.render();
Bike5.move();
Bike6.render();
Bike6.move();
Bike7.render();
Bike7.move();
Bike8.render();
Bike8.move();
Bike9.render();
Bike9.move();
}

void DetectWinner()
{
textSize(15);
fill(0); 
if (Bike1.Pos_X >= 620) {
noLoop(); 
text("Bike 1 Wins", 310, 10, 350, 50); 
Score_Bike1 += 1;
GameState = 2;
}
if (Bike2.Pos_X >= 620) {
noLoop(); 
text("Bike 2 Wins", 310, 10, 350, 50); 
Score_Bike2 += 1;
GameState = 2;
}
if (Bike3.Pos_X >= 620) {
noLoop(); 
text("Bike 3 Wins", 310, 10, 350, 50); 
Score_Bike3 += 1;
GameState = 2;
}
if (Bike4.Pos_X >= 620) {
noLoop(); 
text("Bike 4 Wins", 310, 10, 350, 50); 
Score_Bike4 += 1;
GameState = 2;
}
if (Bike5.Pos_X >= 620) {
noLoop(); 
text("Bike 5 Wins", 310, 10, 350, 50); 
Score_Bike5 += 1;
GameState = 2;
}
if (Bike6.Pos_X >= 620) {
noLoop(); 
text("Bike 6 Wins", 310, 10, 350, 50); 
Score_Bike6 += 1;
GameState = 2;
}
if (Bike7.Pos_X >= 620) {
noLoop(); 
text("Bike 7 Wins", 310, 10, 350, 50); 
Score_Bike7 += 1;
GameState = 2;
}
if (Bike8.Pos_X >= 620) {
noLoop(); 
text("Bike 8 Wins", 310, 10, 350, 50); 
Score_Bike8 += 1;
GameState = 2;
}
if (Bike9.Pos_X >= 620) {
noLoop(); 
text("Bike 9 Wins", 310, 10, 350, 50); 
Score_Bike9 += 1;
GameState = 2;
}
}

void DisplayScore()
{
textSize(15);
fill(0); 
text("Bike 1: " + Score_Bike1 + Score_Spacing + "Bike 2: " + Score_Bike2 +   Score_Spacing + "Bike 3: " + 
Score_Bike3 + Score_Spacing +  "Bike 4: " + Score_Bike4 + Score_Spacing +   "Bike 5: " + Score_Bike5 + Score_Spacing + 
"Bike 6: " + Score_Bike6 + Score_Spacing +  "Bike 7: " + Score_Bike7 + Score_Spacing +  "Bike 8: " + Score_Bike8 + 
Score_Spacing + "Bike 9: " + Score_Bike9, 65, 530, 635, 700);
}

void keyPressed()
{
if (keyPressed) { 
if (key == ' ') 
{
  if (GameState == 0) {
    GameState = 1;
  }
  if (GameState == 2) {
    loop();
    background(200);
    SpawnBikes();
    GameState = 0;
  }
  }
}
}

void SpawnBikes()
{
Bike1 = new MotorBike(50, 100, 2, color(255, 0, 0));
Bike2 = new MotorBike(50, 150, 2, color(0, 255, 0)); 
Bike3 = new MotorBike(50, 200, 2, color(0, 0, 255)); 
Bike4 = new MotorBike(50, 250, 2, color(255, 255, 0));
Bike5 = new MotorBike(50, 300, 2, color(0, 255, 255)); 
Bike6 = new MotorBike(50, 350, 2, color(255, 0, 255)); 
Bike7 = new MotorBike(50, 400, 2, color(100, 255, 0));
Bike8 = new MotorBike(50, 450, 2, color(0, 100, 255)); 
Bike9 = new MotorBike(50, 500, 2, color(255, 0, 100));
}

Answer 1

您的问题是由于您将草图命名为与您在草图中使用的类相同的名称。如果您的草图中有 MotorBike 类，则您的草图不能命名为 MotorBike。

要么重命名你的草图，要么重命名你的类。

在幕后，这是因为 Processing 将您的草图导出为 Java 类，并且草图中的任何类都成为该 Java 类的内部类。所以你的草图变成了这样：

class MotorBike{
   void draw(){
      //whatever
   }

   class MotorBike{
      int x;
      //whatever
   }
}

这是非法的 Java，这是导致您的错误的原因。您不能拥有与父类同名的内部类。换句话说，嵌套类型不能隐藏封闭类型。

这也是为什么当你将它复制到一个新的草图中时它可以正常工作的原因——处理给你的草图一个随机的默认名称，所以在你将草图另存为其他东西之前，你不会发生这种名称冲突。