乒乓遊戲：牆壁和球幾乎完全一樣 - 如何超級Ellipse2D和Rectangle2D？

Question

我正處於學習Java的早期階段，我只是想做一個簡單的Pong類遊戲。我有2班Wall和Ball。它們幾乎完全相同，只是它們在它們中都有不同的java.awt.geom子類（一個具有Ellipse2d和一個Rectangle2D），但幾乎在所有其他方面它們都是相同的（Ball類將有更多的變量處理velocity ，但其他方面相同）。

我的問題是，現在我看到有冗餘我想做一個超類GameObject。我只是不知道如何處理的事實，兩個子類指和Ellipse2D的矩形2D

類華爾街{

private double posX, posY, width, height; // wall position and dimensions 
Rectangle2D wall2D; 

/** 
* 
*/ 
public Wall(double Xin, double Yin, double widthIn, double heightIn) { // passes in variables and creates a new Ellipse2D 
    posX = Xin; 
    posY = Yin; 
    width = widthIn; 
    height = heightIn; 
    wall2D = new Rectangle2D.Double(posX, posY, width, height); 
} 

private void setWall2D() { // makes the Wall2D have the same location/dimensions as the variables in this class 
    wall2D.setFrame(posX, posY, width, height); 
} 

Rectangle2D getWall2D() { // returns the actual Rectangle2D so it can get displayed on the screen when needed 
    return wall2D; 
} 

// getters 
double getPositionX() { 
    return posX; 
} 

double getPositionY() { 
    return posY; 
} 

double getHeight() { 
    return height; 
} 

double getWidth() { 
    return width; 
} 

// setters (all have to call setWall2D after variable has been set! - to update the actual Rectangle2D shape) 
void setPositionX(double xIn) { 
    posX = xIn; 
    setWall2D(); 
} 

void setPositionY(double yIn) { 
    posY = yIn; 
    setWall2D(); 
} 

void setHeight(double heightIn) { 
    height = heightIn; 
    setWall2D(); 
} 

void setwidth(double widthIn) { 
    width = widthIn; 
    setWall2D(); 
} 

}

這裏是我的球類

class Ball { 
    private double posX, posY, width, height; // ball position and dimensions 
    Ellipse2D ball2D; 

    /** 
    * 
    */ 
    public Ball(double Xin, double Yin, double widthIn, double heightIn) { // passes in variables and creates a new Ellipse2D 
     posX = Xin; 
     posY = Yin; 
     width = widthIn; 
     height = heightIn; 
     ball2D = new Ellipse2D.Double(posX, posY, width, height); 
    } 

    private void setBall2D() { // makes the Ball2D have the same location/dimensions as the variables in this class 
     ball2D.setFrame(posX, posY, width, height); 
    } 

    Ellipse2D getBall2D() { // returns the actual Ellipse2D so it can get displayed on the screen when needed 
     return ball2D; 
    } 

    // getters 
    double getPositionX() { 
     return posX; 
    } 

    double getPositionY() { 
     return posY; 
    } 

    double getHeight() { 
     return height; 
    } 

    double getWidth() { 
     return width; 
    } 

    // setters (all have to call setBall2D after variable has been set! - to update the actual Ellipse2D shape) 
    void setPositionX(double xIn) { 
     posX = xIn; 
     setBall2D(); 
    } 

    void setPositionY(double yIn) { 
     posY = yIn; 
     setBall2D(); 
    } 

    void setHeight(double heightIn) { 
     height = heightIn; 
     setBall2D(); 
    } 

    void setwidth(double widthIn) { 
     width = widthIn; 
     setBall2D(); 
    } 

} 

任何意見，將不勝感激。提前致謝。

Answer 1

商店RectangularShape在共同的超類而不是Ellipse2D/Rectangle2D？您還可以指定合適的子類中的相應的構造函數...

class GameObject { 
    RectangularShape shape; 
    ... 
} 

class Ball extends GameObject { 
    public Ball(double Xin, double Yin, double widthIn, double heightIn) { 
    // passes in variables and creates a new Ellipse2D 
    posX = Xin; 
    posY = Yin; 
    width = widthIn; 
    height = heightIn; 
    shape = new Ellipse2D.Double(posX, posY, width, height); 
    }