匿名内部类

XWxiaowei · XWxiaowei · commit 169328af21f3 · 2018-01-28T08:55:26.000+08:00
diff --git a/java-base-demo/src/main/java/com/jay/innerClass/TlockTest.java b/java-base-demo/src/main/java/com/jay/innerClass/TlockTest.java
@@ -3,6 +3,7 @@
 import java.awt.*;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
+import java.util.Arrays;
 import java.util.Date;
 
 /**
@@ -47,10 +48,18 @@ public void actionPerformed(ActionEvent e) {
     
         
         public void start2() {
-            int counter = 0;
+            int[] counter = new int[1];
             Date[] dates = new Date[100];
             for (int i = 0; i < dates.length; i++) {
-                
+                dates[i] = new Date(){
+                    @Override
+                    public int compareTo(Date other) {
+                        counter[0]++;  //ERROR
+                        return super.compareTo(other);
+                    }
+                };
+                Arrays.sort(dates);
+                System.out.println(counter+"comparisons");
             }
         }
     }
diff --git a/java-base-demo/src/main/java/com/jay/innerClass/内部类.md b/java-base-demo/src/main/java/com/jay/innerClass/内部类.md
@@ -109,5 +109,45 @@ class TalkingClock {
 
 假设想更新在一个封闭作用域内的计数器。这里想要统计一下在排序过程中调用
 `compareTo` 方法的次数
+```
+ public void start2() {
+        int counter = 0;
+        Date[] dates = new Date[100];
+        for (int i = 0; i < dates.length; i++) {
+            dates[i] = new Date(){
+                public int compareTo(Date other) {
+                    counter++;  //ERROR
+                    return super.compareTo(other);
+                }
+            };
+            Arrays.sort(dates);
+            System.out.println(counter+"comparisons");
+        }
+    } 
+
+```
+可以替代的方案是：
+```
+ public void start2() {
+        int[] counter = new int[1];
+        Date[] dates = new Date[100];
+        for (int i = 0; i < dates.length; i++) {
+            dates[i] = new Date(){
+                @Override
+                public int compareTo(Date other) {
+                    counter[0]++;  //ERROR
+                    return super.compareTo(other);
+                }
+            };
+            Arrays.sort(dates);
+            System.out.println(counter+"comparisons");
+        }
+    }
+```
+### 匿名内部类
+只创建了一个类的一个对象。
+由于构造器的名字必须与类名相同，而匿名内部类没有类名。所以，匿名类不能有构造器。取而代之的是，将构造器参数
+传递给超类构造器。尤其是在内部类实现接口的时候，不能有任何构造参数。
+
 
 
