Chapter 07 section 05-06 codes updated.

Author: liuyubobobo

07-Mine-Sweeper/05-Knuth-Shuffle/01-Knuth-Shuffle-1/src/KnuthShuffle.java

@@ -49,6 +49,7 @@ private void reset(int[] arr){
     private void shuffle(int[] arr){
 
         for(int i = 0 ; i < n ; i ++){
+            // 从 [i, n) 区间里随机选择元素
             int x = (int)(Math.random() * (n-i)) + i;
             swap(arr, i, x);
         }

07-Mine-Sweeper/06-Interactions-in-Mine-Sweeper/src/AlgoVisualizer.java

@@ -9,7 +9,6 @@ public class AlgoVisualizer {
 
     private MineSweeperData data;
     private AlgoFrame frame;
-    private static final int d[][] = {{-1,0},{0,1},{1,0},{0,-1}};
 
     public AlgoVisualizer(int N, int M, int mineNumber){
 
@@ -33,13 +32,11 @@ public void run(){
     }
 
     private void setData(boolean isLeftClicked, int x, int y){
-        if(isLeftClicked){
-            if(data.inArea(x, y))
+        if(data.inArea(x, y)){
+            if(isLeftClicked)
                 data.open[x][y] = true;
-        }
-        else{
-            if(data.inArea(x, y))
-                data.flags[x][y] = true;
+            else
+                data.flags[x][y] = !data.flags[x][y];
         }
 
         frame.render(data);
@@ -80,8 +77,8 @@ else if(SwingUtilities.isRightMouseButton(event))
     public static void main(String[] args) {
 
         int N = 20;
-        int M = 30;
-        int mineNumber = 20;
+        int M = 20;
+        int mineNumber = 50;
 
         AlgoVisualizer vis = new AlgoVisualizer(N, M, mineNumber);
     }

07-Mine-Sweeper/06-Interactions-in-Mine-Sweeper/src/MineSweeperData.java

@@ -4,7 +4,7 @@ public class MineSweeperData {
     public static final String flagImageURL = "resources/flag.png";
     public static final String mineImageURL = "resources/mine.png";
     public static String numberImageURL(int num){
-        if(num < 0 || num >= 8)
+        if(num < 0 || num > 8)
             throw new IllegalArgumentException("No such a number image!");
         return "resources/" + num + ".png";
     }