處理錯誤：功能的init（）不存在

Question

主類：

Player thePlayer = new Player(); 
Guard theGuard = new Guard(); 

void setup() { 
    size(1000, 500); 
    theGuard.init(); 
    thePlayer.init(); 
} 

void updateGame() { 
    thePlayer.update(); 
} 

void drawGame() { 
    background(0); 
    thePlayer.draw(); 

    fill(color(255, 255, 255)); 
    text("Score:" + score, 10, 20); 
} 

void draw() { 
    fill (255, 255, 255); 
    rect(0, 401, 1000, 100); 
    noFill(); 

    updateGame(); 
    drawGame(); 
} 

GUARD CLASS

class Guard { 
    float x, y; 
    float vx, vy; 
    float fillColor; 
    float diameter; 
} 

void init() { 

} 

void update() { 
    if (x == (irandom(width)-100)) 
    vx = 3; 

    if (x == (irandom(width)+100)) 
    vx = -3; 

    x += vx; 
    y += vy; 
} 

void draw() { 
    fill(fillColor); 
    rect(x, y, diameter, diameter); 
} 

播放器類

class Player { 
    float x, y; 
    float vx, vy; 
    float fillColor; 
    float playerHeight, playerWidth; 
    float jumpTime; 
    boolean isJumping; 
} 

void init() { 
    playerHeight = 20; 
    playerWidth = 20; 
    fillColor = color(255, 255, 255); 
    jumpTime = 200; 
    isJumping = false; 

    x = 100; 
    y = 400; 

    vx = 0; 
    vy = 0; 
} 

void update() { 
    if (keyPressed) { 
    if (keyCode == LEFT) vx = -2; 
    if (keyCode == RIGHT) vx = 2; 
    if (keyCode == UP) isJumping = true; 
    if (keyCode == DOWN) playerHeight = 10; 
    } 
    else { 
    vx = 0; 
    vy = 0; 
    } 

    if (isJumping == true) { 
    vy = -2; 
    } 
    else { 
    vy -= 0.1; 
    } 

    if (y == 100) 
    vy = 0; 

    x += vx; 
    y += vy; 
} 

void draw() { 
    fill(fillColor); 
    ellipse(x, y, playerWidth, playerHeight); 
} 

我刨光在Processing（JAVA）中處理它。但我不知道爲什麼我的代碼不起作用。當我嘗試啓動遊戲時，它會給出錯誤：「函數init（）不存在」。該功能在主類的第6/7行中使用。有沒有辦法創建這個功能或什麼的？

Answer 1

請注意括號定義的類和方法在這裏。 Guard沒有一個init()

class Guard { 
    ... 
} 

void init() { 

} 

當然應該在Guard定義init。大概應該在它自己的文件中定義Guard，Guard.java