亚洲不卡中文字幕,亚洲色图黄色小说,亚洲人成无码网站在线观看

Google Collections之Multimap、Multiset

hankchen — Tue, 12 Jan 2010 16:51:00 GMT

  1package googleCollections;
  2
  3import java.util.ArrayList;
  4import java.util.Collection;
  5import java.util.HashMap;
  6import java.util.List;
  7import java.util.Map;
  8
  9import com.google.common.collect.ArrayListMultimap;
10import com.google.common.collect.ConcurrentHashMultiset;
11import com.google.common.collect.Multimap;
12import com.google.common.collect.Multiset;
13
14/**
15 * Copyright (C): 2009
16 * @author 陈新�?nbsp;http://www.tkk7.com/hankchen
17 * @version 创徏旉��Q�Jan 12, 2010 11:55:49 PM
18 */
19
20/**
21 * 模拟��试情�Ş�Q�描�q�每个学生有多本书籍
22 *
23 * Multimap适合保存��q��囄��数据
24 */
25public class MultiCollectionsTest {
26
27    /**
28     * @param args
29     */
30    public static void main(String[] args) {
31        /**
32         * 以前的方�?br /> 33         */
34        Map<Student, List<Book>> studentBook = new HashMap<Student, List<Book>>();
35        Student me=new Student("chenxinhan");
36        List<Book> books=new ArrayList<Book>();
37        books.add(new Book("语文"));
38        books.add(new Book("数学"));
39        studentBook.put(me,books);
40        //遍历
41        for(Book b:books){
42            System.out.println(b.getName());
43        }
44
45        /**
46         * 现在的方�?br /> 47         */
48        Multimap <Student,Book> newStudentBook = ArrayListMultimap.create();
49        Student cxh=new Student("chenxinhan");
50        newStudentBook.put(cxh,new Book("语文"));
51        newStudentBook.put(cxh,new Book("数学"));
52        //遍历
53        Collection<Book> list=newStudentBook.get(cxh);
54        for(Book b:list){
55            System.out.println(b.getName());
56        }
57
58        /**
59         * Multiset��试
60         * 不同于一般的Set�Q�Multiset可以允许重复�?br /> 61         */
62        Multiset<Book> bs=ConcurrentHashMultiset.create();
63        Book b=new Book("Test");
64        bs.add(b);
65        bs.add(b);
66        bs.add(b);
67        for(Book ab:bs){
68            System.out.println(ab.getName());
69        }
70    }
71
72}
73
74class Student{
75    private String name;
76
77    public String getName() {
78        return name;
79    }
80    public void setName(String name) {
81        this.name = name;
82    }
83    public Student(String name) {
84        this.name = name;
85    }
86
87}
88
89class Book{
90    private String name;
91
92    public String getName() {
93        return name;
94    }
95
96    public void setName(String name) {
97        this.name = name;
98    }
99
100    public Book(String name) {
101        this.name = name;
102    }
103}
104

�Q�友情提�C�：本博文章�Ƣ迎转蝲�Q�但��h��明出处：hankchen�Q?a title="http://www.tkk7.com/hankchen" href="http://www.tkk7.com/hankchen">http://www.tkk7.com/hankchen�Q?/strong>

hankchen 2010-01-13 00:51 发表评论

hankchen — Tue, 12 Jan 2010 16:47:00 GMT

1package googleCollections;
2
3import java.util.ArrayList;
4import java.util.Arrays;
5import java.util.Collections;
6import java.util.List;
7import java.util.Map.Entry;
8
9import com.google.common.collect.ImmutableList;
10import com.google.common.collect.ImmutableMap;
11import com.google.common.collect.ImmutableSet;
12
13/** *//**
14 * Copyright (C): 2009
15 * @author 陈新�?nbsp;
16 * @version 创徏旉��Q�Jan 12, 2010 11:10:05 PM
17 */
18
19/** *//**
20 * 不可变集合类
21 * 适合作�ؓ内容数据不可变的容器�c?br /> 22 * 例如�Q�常量数�l�、常量Map�{�等�?br /> 23 *
24 * 注意�Q��ؓ了实��C��可变集合�Q�JDK 5.0里面是通过Collections.unmodifiableList(list)实现的！
25 */
26public class ImmutableListTest {
27
28    public static final List<String> imlist; //以前实现�Q�方式一�Q?/span>
29    public static final List<String> imlist2; //以前实现�Q�方式二�Q?/span>
30
31    static{
32        List<String> list=new ArrayList<String>();
33        list.add("a");
34        list.add("b");
35        list.add("c");
36        imlist=Collections.unmodifiableList(list); //通过�q�种方式实现不可变的集合,以前实现�Q�方式一�Q?/span>
37        imlist2=Collections.unmodifiableList(Arrays.asList("a","b","c")); //或者，通过�q�种方式实现不可变的集合,以前实现�Q�方式二�Q?/span>
38    }
39
40    /** *//**
41     * @param args
42     */
43    public static void main(String[] args)
44    {
45        //帔R��列表
46        ImmutableList<String> imlist=ImmutableList.of("a", "b", "c");
47        //imlist.add("d"); //注意�Q�编译会报异�?/span>
48        for(String s:imlist){
49            System.out.println(s);
50        }
51
52        //帔R��Map
53        ImmutableMap<String,String> immap=new ImmutableMap.Builder<String,String>()
54                                            .put("a","1")
55                                            .put("b","2")
56                                            .put("c", "3")
57                                            .build();
58        for(Entry<String,String> e:immap.entrySet()){
59            System.out.println(e.getKey()+"="+e.getValue());
60        }
61
62        //帔R��Set
63        ImmutableSet<String> imset=ImmutableSet.of("a","b","c");
64        for(String s:imset){
65            System.out.println(s);
66        }
67    }
68
69}
70

�Q�友情提�C�：本博文章�Ƣ迎转蝲�Q�但��h��明出处：hankchen�Q?a title="http://www.tkk7.com/hankchen" href="http://www.tkk7.com/hankchen">http://www.tkk7.com/hankchen�Q?/strong>

hankchen 2010-01-13 00:47 发表评论

静态内部类

hankchen — Tue, 05 Jan 2010 09:25:00 GMT
     摘要: 内部�c�L��一个很好的工具�Q��用内部类可以��化代码，同时提高代码的优雅度�? �Q�友情提�C�：本博文章�Ƣ迎转蝲�Q�但��h��明出处：hankchen�Q�http://www.tkk7.com/hankchen�Q? 下面介绍内部�c�d��静态内部类的用法区别：   1/** *//**   2 *  ...  阅读全文

hankchen 2010-01-05 17:25 发表评论

hankchen — Tue, 29 Dec 2009 12:58:00 GMT

最�q�看��C��道面试题�Q�比较有意思：

有三个线�E?/span>ID分别�?/span>A�?/span>B�?/span>C,��h��多线�~�程实现�Q�在屏幕上��@环打�?/span>10��?/span>ABCABC…

�׃��U�程执行的不��定性，要保证这��h��序的输出�Q�必��L��制好多线�E�的同步�?br />

�U�程同步有两�U�基本方法：

�Q?�Q?span style="font: 7pt 'Times New Roman'">    synchronized

�Q?�Q?span style="font: 7pt 'Times New Roman'">    wait,notify,notifyAll

现在分别采用�q�两�U�方法来解答�q�道题目�?/span>

/**

* @author陈新�?http://www.tkk7.com/hankchen

* 2009-12-28 下午01:57:04

*/

/**

*采用多线�E�技术打�?/span>10��?/span>“ABC”�Q�即“�Q��Q�Ａ�Q��E...”

* 实现方式�Q�一�Q�利�?/span>synchronized关键字实�?/span>

*/

public class XunleiInterviewMultithread {

       /**

       * @param args

       */

       public static void main(String[] args) {

              XunleiLock lock = new XunleiLock();

              new Thread(new XunleiPrinter("A", lock)).start();

              new Thread(new XunleiPrinter("B", lock)).start();

              new Thread(new XunleiPrinter("C", lock)).start();

       }

}

class XunleiPrinter implements Runnable {

       private String name = "";

       private XunleiLock lock = null;

       private int count=10;

       public XunleiPrinter(String name, XunleiLock lock) {

              this.name = name;

              this.lock = lock;

       }

       @Override

       public void run() {

              while(count>0) {

                     synchronized (lock) {

                            if (lock.getName().equalsIgnoreCase(this.name)) {

                                   System.out.print(name);

                                   count--;

                                   if (this.name.equals("A")) {

                                          lock.setName("B");

                                   } elseif (this.name.equals("B")) {

                                          lock.setName("C");

                                   } elseif (this.name.equals("C")) {

                                          lock.setName("A");

                                   }

                            }

                     }

              }

       }

}

class XunleiLock

{

       public String name = "A";

       public String getName() {

              return name;

       }

       public void setName(String name) {

              this.name = name;

       }

}

�Ҏ��Q�二�Q?/span>�U�程�c�M��改如下，其他�c�M��P��

class XunleiPrinter2 implements Runnable {

       private String name = "";

       private XunleiLock lock = null;

       private int count=10;

       public XunleiPrinter2(String name, XunleiLock lock) {

              this.name = name;

              this.lock = lock;

       }

       @Override

       public void run() {

              while(count>0) {

                     synchronized (lock) {

                            while(!lock.getName().equalsIgnoreCase(this.name)) {

                                   try{

                                          lock.wait();

                                   }catch(InterruptedException e){

                                          e.printStackTrace();

                                   }

                            }

                            System.out.print(name);

                            count--;

                            if (this.name.equals("A")) {

                                   lock.setName("B");

                            } elseif (this.name.equals("B")) {

                                   lock.setName("C");

                            } elseif (this.name.equals("C")) {

                                   lock.setName("A");

                            }

                            lock.notifyAll();

                     }

              }

       }

}
�Q�友情提�C�：本博文章�Ƣ迎转蝲�Q�但��h��明出处：陈新汉，http://www.tkk7.com/hankchen�Q?br />

hankchen 2009-12-29 20:58 发表评论