操作非静态变量

Question

所以在我的课堂上，我们让对象根据 x 和 y 坐标变量移动，这很简单。但是，如果我在单独的静态类中声明 x 和 y 变量，我似乎只能让我的工作，而教师示例代码似乎没有这样做。我一直在看老师的示例代码，它为什么会这样工作是有道理的，但是当我尝试将类似的方法应用于我的代码时，它似乎不起作用，我无法找出我的'我做错了。

教师代码：

// A Bug that moves from left to right and vibrates up and down randomly in the output window 
class Bug {
    // The x- and y-coordinates as well as the speed a Bug is moving
    int x;
    int y;
    int speed;
    // The color of the Bug
    int red;
    int green;
    int blue;

    // Initialize the x- and y-coordinates, the speed and the RGB colors
    Bug() {
        x = -80;
        y = (int) random(10, height - 10);
        speed = (int) random(1, 5);
        red = (int) random(255);
        green = (int) random(255);
        blue = (int) random(255);
    }

    // Set the fill color and ellipseMode
    // Create a for loop that draw “bugs” as six consecutive attached circles 
    void displayBug() {
        fill(red, green, blue, 175);
        ellipseMode(CENTER);
        for (int ctr = 0; ctr < 90; ctr += 15) {
            circle(x + ctr, y, 20);
        }
    }

    // Add the speed instance variable to the x-coordinate
    // Add a random value between -2 and 2 to the y-coordinate
    void moveBug() {
        x += speed;
        y += (int) random(-2, 2);
    }

    // Constrain the y-coordinate between 10 and the height of the output window minus 10
    void boundaries() {
        y = constrain(y, 10, height - 10);
    }
    // If the x-coordinate is greater than width of the output window, reset the x-coordinate to 
    -80

    void resetBug() {
        if (x > width) {
            x = -80;
        }
    }
}

我尝试在没有静态类的情况下移动圆圈的示例：

class Test{
    int x;
    int y;
    int speed;
    Test(){
        x = 1;
        y =(int) random(0,400);
        speed = 1;
    }
    void drawThing(){
        circle(x,y,10);
    }
    void moveThing(){
        x += speed;
    }
}

Answer 1

这是我的驱动程序中的代码：

Test draw;
Test move;
void setup(){
size(400,400);
draw = new Test();
move = new Test();
}
void draw(){
draw.drawThing();
move.moveThing();
}

但是用draw.moveThing 将move 换成move.moveThing 已修复。