1 package thinking.in.java.demo;
 2
 3 //定义一个接口
 4 interface Counter {
 5     int next();
 6 }
 7
 8 // 主类LocalInnerClass
 9 public class LocalInnerClass {
10     // 定义一个计数标记count;
11     private int count = 0;
12
13     // 使用局部内部类
14     Counter getCounter(final String name) {
15         class LocalCounter implements Counter {
16             public LocalCounter() {
17                 System.out.println("LocalCount()");
18             }
19
20             public int next() {
21                 System.out.print(name+":");
22                 return count++;
23             }
24         }
25         // 局部内部类和匿名内部类最大的不同之处：局部内部类可以返回不止一个内部类的对象
26         // 与下面的匿名内部类的代码形成鲜明对比
27         return new LocalCounter();
28     }
29
30     // 使用匿名内部类
31     Counter getCounter2(final String name) {
32         return new Counter() {
33             {
34                 System.out.println("Counter");
35             }
36
37             @Override
38             public int next() {
39                 System.out.print(name+":");
40                 return count++;
41             }
42         };
43     }
44
45     /**
46      * @param args
47      */
48     public static void main(String[] args) {
49         LocalInnerClass lic = new LocalInnerClass();
50         // 局部内部类
51         Counter c1 = lic.getCounter("Local inner");
52         // 匿名内部类
53         Counter c2 = lic.getCounter2("Anonymous inner");
54         for (int i = 0; i < 5; i++) {
55             System.out.println(c1.next());
56         }
57         for (int j = 0; j < 5; j++) {
58             System.out.println(c2.next());
59         }
60     }
61
62 }

LocalCount()
Counter
Local inner:0
Local inner:1
Local inner:2
Local inner:3
Local inner:4
Anonymous inner:5
Anonymous inner:6
Anonymous inner:7
Anonymous inner:8
Anonymous inner:9