從構造函數傳遞參數到處理中的函數/ java

Question

我在處理某些對象時遇到了問題。代碼應該有兩個對象顯示和移動。但我只看到一個對象顯示和移動。也許有一些我錯過了。檢查代碼。

Rule myRule; 
Rule myRule1; 

void setup() { 
    size(200,200); 
    smooth(); 

    //Initialize rule objects 
    myRule = new Rule(0,100,1); 
    myRule1 = new Rule(0,140,20); 
} 



void draw() { 
    background(255); 
    //int x1 = 0; 
    //int y1 = 0; 
    //Operate Rule object 
    myRule.move(); 
    myRule.display(); 
    myRule1.move(); 
    myRule1.display(); 
} 


class Rule { 

    float x; 
    float y; 
    float spacing; 
    float speed; 

    Rule(float x1, float y1, float s1) { 
    x = x1; 
    y = y1; 
    spacing = 10; 
    speed = s1; 
    } 

    void move() { 
    x = x + speed; 
    if((x > width) || (x < 0)) { 
     speed = speed * -1; 
    } 
    } 

    //Display lines at x location 
    void display() { 
    stroke(0); 
    fill(175); 
    line(x, height/2, width/2, height/2); 
    } 
} 

Answer 1

這是Rule.display()的拼寫錯誤。你大概意思是這樣

線（X，ÿ，寬度/ 2，高度/ 2）;