Chapter 03 section 01-02 codes bug fixed.

Author: liuyubobobo

03-Probability-Simulation/01-A-Money-Experiment-Basics/src/AlgoVisualizer.java

@@ -27,12 +27,12 @@ public void run(){
 
         while(true){
 
-            int i = (int)(Math.random() * money.length);
-            int j = (int)(Math.random() * money.length);
-
-            if(money[i] > 0){
-                money[i] -= 1;
-                money[j] += 1;
+            for(int i = 0 ; i < money.length; i ++){
+                if(money[i] > 0){
+                    int j = (int)(Math.random() * money.length);
+                    money[i] -= 1;
+                    money[j] += 1;
+                }
             }
 
             frame.render(money);

03-Probability-Simulation/02-More-about-the-Money-Experiment/src/AlgoVisualizer.java

@@ -31,11 +31,14 @@ public void run(){
         while(true){
 
             // 改进1：每一帧执行的tick数
-            for(int k = 0 ; k < DELAY*100 ; k ++){
-                int i = (int)(Math.random() * money.length);
-                int j = (int)(Math.random() * money.length);
-                money[i] -= 1;
-                money[j] += 1;
+            for(int k = 0 ; k < 50 ; k ++){
+                for(int i = 0 ; i < money.length; i ++){
+                    //if(money[i] > 0){
+                        int j = (int)(Math.random() * money.length);
+                        money[i] -= 1;
+                        money[j] += 1;
+                    //}
+                }
             }
 
             // 改进2：是否排序

03-Probability-Simulation/03-Get-PI-with-Monte-Carlo/src/AlgoFrame.java

@@ -14,7 +14,6 @@ public class AlgoFrame extends JFrame{
 
     private int canvasWidth;
     private int canvasHeight;
-    private JPanel canvas;
 
     public AlgoFrame(String title, int canvasWidth, int canvasHeight){
 

03-Probability-Simulation/03-Get-PI-with-Monte-Carlo/src/AlgoVisHelper.java

@@ -34,35 +34,35 @@ private AlgoVisHelper(){}
     public static final Color White = new Color(0xFFFFFF);
 
 
-    static public void strokeCircle(Graphics2D g, int x, int y, int r){
+    public static void strokeCircle(Graphics2D g, int x, int y, int r){
 
         Ellipse2D circle = new Ellipse2D.Double(x-r, y-r, 2*r, 2*r);
         g.draw(circle);
     }
 
-    static public void fillCircle(Graphics2D g, int x, int y, int r){
+    public static void fillCircle(Graphics2D g, int x, int y, int r){
 
         Ellipse2D circle = new Ellipse2D.Double(x-r, y-r, 2*r, 2*r);
         g.fill(circle);
     }
 
-    static public void strokeRectangle(Graphics2D g, int x, int y, int w, int h){
+    public static void strokeRectangle(Graphics2D g, int x, int y, int w, int h){
 
         Rectangle2D rectangle = new Rectangle2D.Double(x, y, w, h);
         g.draw(rectangle);
     }
 
-    static public void fillRectangle(Graphics2D g, int x, int y, int w, int h){
+    public static void fillRectangle(Graphics2D g, int x, int y, int w, int h){
 
         Rectangle2D rectangle = new Rectangle2D.Double(x, y, w, h);
         g.fill(rectangle);
     }
 
-    static public void setColor(Graphics2D g, Color color){
+    public static void setColor(Graphics2D g, Color color){
         g.setColor(color);
     }
 
-    static public void setStrokeWidth(Graphics2D g, int w){
+    public static void setStrokeWidth(Graphics2D g, int w){
         int strokeWidth = w;
         g.setStroke(new BasicStroke(strokeWidth, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND));
     }
@@ -95,31 +95,4 @@ public static void drawText(Graphics2D g, String text, int centerx, int centery)
         g.drawString(text, centerx - w/2, centery + h);
     }
 
-    public static void strokeTriangle(Graphics2D g, int x1, int y1, int x2, int y2, int x3, int y3){
-
-        GeneralPath path = new GeneralPath();
-        path.moveTo(x1, y1);
-        path.lineTo(x2, y2);
-        path.lineTo(x3, y3);
-        path.closePath();
-
-        g.draw(path);
-    }
-
-    public static void fillTriangle(Graphics2D g, int x1, int y1, int x2, int y2, int x3, int y3){
-
-        GeneralPath path = new GeneralPath();
-        path.moveTo(x1, y1);
-        path.lineTo(x2, y2);
-        path.lineTo(x3, y3);
-        path.closePath();
-
-        g.fill(path);
-    }
-
-    public static void drawLine(Graphics2D g, double x1, double y1, double x2, double y2){
-
-        Line2D line = new Line2D.Double(x1, y1, x2, y2);
-        g.draw(line);
-    }
 }