在方法中擺脫複製粘貼代碼的方法

Question

我使用gpdraw和pen.drawOval（num1，num2）創建了一個使用num1和num2的增量操作符爲5的球體的可視化表示。創建這個有我複製粘貼相同的兩行代碼40次。無論如何，這看起來似乎並不高效或專業。我如何重複這些行的確切次數或重複該方法的確切次數？

DrawSphereTester類

public class SphereDrawTester 
{ 
public static void main(String[] args) 
    { 
     SphereDraw draw = new SphereDraw(); 
     draw.draw(); 
    } 
} 

DrawSphere類

import gpdraw.*; 

public class SphereDraw 
{ 
    //Instance variables 
    public SketchPad Paper; 
    public DrawingTool pen; 

//Constructor 
public SphereDraw() 
{ 

    Paper = new SketchPad(800, 800); 
    pen = new DrawingTool(Paper); 
} 

public void draw() 
{ 
    int num1 = 0; 
    int num2 = 200; 

    pen.drawCircle(100); 

    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 
    num1 += 5; 
    pen.drawOval(num1,num2); 

} 
} 

Answer 1

我的朋友，它的時間來了解循環！

for (int i = 0; i < 40; ++i) { 
    pen.drawOval(num1,num2); 
    num1 += 5; 
}