前沿拓展：

eee4444

手機(jī)靚號(hào)，通俗講，即有規(guī)律的排列，順口或有多個(gè)重復(fù)排列，組合循環(huán)等的受歡迎的手機(jī)號(hào)，當(dāng)策行親反家面探但過半然，除以上外還包括吉利數(shù)字習(xí)俗的重復(fù)排列，組合循環(huán)錯(cuò)班相趙頭部客策題益等，如四連號(hào)8888、6666……那在河南辦理一個(gè)手機(jī)四連號(hào)需要多少錢呢?下邊帶您了解。

1、看一些老號(hào)碼了，保底的高低也是價(jià)格浮動(dòng)的一個(gè)縮漢評(píng)調(diào)養(yǎng)統(tǒng)弦述指費(fèi)很重要因素。

1、Map概述

1.1 什么是Map

Map是將

3.22.HashMap與Hashtable的異同

除了非同步和允許使用 null 之外，HashMap 類與 Hashtable 大致相同

3.23.HashMap的使用示例

public class HashMapReview {
public static void main(String[] args) {
test1();
test2();
} /**
* 自定義類型做key,
* 需重寫其equals和hashCode方法才能保證其key的唯一性
*/
private static void test2() {
HashMap<Info, String> map=new HashMap<Info, String>();
map.put(new Info(0, “aaa”),”0000″);
map.put(new Info(1, “bbb”),”1111″);
map.put(new Info(3, “ddd”),”3333″);
map.put(new Info(0, “aaa”),”4444″);
map.put(new Info(2, “ccc”),”2222″);
printMap(map); // output：// key=Info [id=3, adress=ddd] value=3333// key=Info [id=2, adress=ccc] value=2222// key=Info [id=0, adress=aaa] value=0000// key=Info [id=1, adress=bbb] value=1111// key=Info [id=0, adress=aaa] value=4444 // 當(dāng)Info沒有重寫equals和hashCode方法時(shí)，key出現(xiàn)重復(fù)元素
} /**
* String或基本數(shù)據(jù)類型的包裝類做key，他們已重寫了hashCode與equals方法
* 鍵唯一，重復(fù)添加會(huì)替換舊值成新值
*/
private static void test1() {
HashMap<String, String> map=new HashMap<String, String>();
map.put(“aaa”, “123”);
map.put(“bbb”, “789”);
map.put(“aaa”, “456”);
map.put(“ccc”, “321”);
System.out.println(map); // output：// {aaa=456, ccc=321, bbb=789}
// 重復(fù)的鍵不會(huì)重新插入，只會(huì)替換舊值成新值
} private static void printMap(Map<Info, String> map) {
Set<Entry<Info, String>> entrySet = map.entrySet(); for (Entry<Info, String> entry : entrySet) {
System.out.println(“key=”+entry.getKey()+” value=”+entry.getValue());
}
}
}

3.24 一個(gè)HashMap面試題

需求如下：

已知一個(gè)HashMap<Integer，Person>**， Person有name（String）和age（int）屬性。
請(qǐng)寫一個(gè)方法實(shí)現(xiàn)對(duì)HashMap的排序功能。該方法接收HashMap<Integer，Person>為形參，返回類型為HashMap<Integer，Person>，要求對(duì)HashMap中的Person的age升序進(jìn)行排序。排序時(shí)key=value鍵值對(duì)不得拆散。

分析：

HashMap本身是不保證元素的順序不變的，要對(duì)其排序可使用LinkedHashMap，它是有序的并且還是HashMap的子類，我們可以使用它來完成排序的目的。最后返回它的實(shí)例即可滿足要求 并且還符合多態(tài)的編程思想

示例代碼

public class SortedHashMapDemo { public static void main(String[] args) {
HashMap<Integer, Person> map = new LinkedHashMap<Integer, Person>();
map.put(0, new Person(“小明”, 20));
map.put(1, new Person(“小二”, 26));
map.put(2, new Person(“小四”, 19));
map.put(3, new Person(“阿七”, 33));
map.put(4, new Person(“十四”, 25));
map.put(4, new Person(“小花”, 19));
System.out.println(map);
HashMap<Integer, Person> sortedHashMap = SortedHashMap(map);
System.out.println(sortedHashMap);
} public static HashMap<Integer, Person> SortedHashMap(
HashMap<Integer, Person> map) { // 獲得鍵值對(duì)Set**
Set<Entry<Integer, Person>> entrySet = map.entrySet(); // 將鍵值對(duì)Set**轉(zhuǎn)化為List以用Collections來排序
List<Entry<Integer, Person>> list = new ArrayList<Map.Entry<Integer, Person>>(
entrySet); // 通過Collections來排序，添加比較器，比較年齡
Collections.sort(list, new Comparator<Entry<Integer, Person>>() {
@Override public int compare(Entry<Integer, Person> o1, Entry<Integer, Person> o2) { int result = o2.getValue().age – o1.getValue().age;
result = result == 0 ? o2.hashCode() – o1.hashCode() : result; return result;
}
}); // 創(chuàng)建LinkedHashMap來存儲(chǔ)排好序的List元素
LinkedHashMap<Integer, Person> linkedHashMap = new LinkedHashMap<Integer, Person>(); // 遍歷List，將元素添加到linkedHashMap中
for (Entry<Integer, Person> entry : list) {
linkedHashMap.put(entry.getKey(), entry.getValue());
} return linkedHashMap;
}
}
class Person {
String name; int age; public Person(String name, int age) {
super(); this.name = name; this.age = age;
}
@Override public String toString() { return “Person [name=” + name + “, age=” + age + “]”;
}
}

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http://xiangce.baidu.com/picture/album/list/65a1a30a199527f2021b64339c63dc1dcb40b647
http://xiangce.baidu.com/picture/album/list/a4ccd13e0c-底部咨詢-349caf76e00bf2fbc47
http://xiangce.baidu.com/picture/album/list/b6903815d2d3ddcb72797a00600ee300a51f6eac
http://xiangce.baidu.com/picture/album/list/42a77eec450e19b2d731d4c4e519de86e33b7bac
http://xiangce.baidu.com/picture/album/list/9892d72a543a58b5390cbe1091d10f05767d88ad
http://xiangce.baidu.com/picture/album/list/1fbf4cf00e936c7bb4d4bbdd6edd8f3d969cfc47
http://xiangce.baidu.com/picture/album/list/65a1a30a199527f2010567339c63dc1dcb40b6ad
http://xiangce.baidu.com/picture/album/list/2a775b26687be23fa32f0803e074fe040d81c6ad
http://xiangce.baidu.com/picture/album/list/97996fe36ffc9c9ade560c3316c6d02f0b83cbad
http://xiangce.baidu.com/picture/album/list/dbbf9b87583fa14e5665145a77f687df4f18d9ad
http://xiangce.baidu.com/picture/album/list/c4d0c7e329ab67001c46f621942456f26a14f6ad
http://xiangce.baidu.com/picture/album/list/92855510af584d086f178c295b0763ca0f9306ad
http://xiangce.baidu.com/picture/album/list/a3ae4f34e300a41f02520b7cd04f12c233e76347
http://xiangce.baidu.com/picture/album/list/2fa14f7e02c202337437ad3f4a86c512e67b18ad
http://xiangce.baidu.com/picture/album/list/90695bbdd95cd9e35751723d782bfb0e9fee8240
http://xiangce.baidu.com/picture/album/list/6b96c1f57fd6dc2a2472ca2c58b5d-底部咨詢-
http://xiangce.baidu.com/picture/album/list/9d5ed64e902b5660ceba91eec02903bdcfdda540
http://xiangce.baidu.com/picture/album/list/7259783ab5da8b5c44b861a5d9e6f974912baf40
http://xiangce.baidu.com/picture/album/list/b9e7e5cd6e00be2f33adbf0f8c30199526f2b140
http://xiangce.baidu.com/picture/album/list/046140c69c9a7d2b324788d0d02f0a83d0becc40
http://xiangce.baidu.com/picture/album/list/9a3ecd01b556780579c5bee7f164c466baba72ad
http://xiangce.baidu.com/picture/album/list/c4d0c7e329ab67001f59f521942456f26a14f640
http://xiangce.baidu.com/picture/album/list/ebe06232016a113f3465fddc0e936c7bc6b7f840
http://xiangce.baidu.com/picture/album/list/e66eecea5f07600fb19de185282ecbabc2491540
http://xiangce.baidu.com/picture/album/list/468b0b7030294a869770796d73137ff9bb631b40
http://xiangce.baidu.com/picture/album/list/2cc3cd050d-底部咨詢-3120c8123409730b8ae
http://xiangce.baidu.com/picture/album/list/10ccb80cc0c373ba6275a7a8bdfd5b2d44033940
http://xiangce.baidu.com/picture/album/list/435832d34f36ab35127b29ab583fa14ec618e5ae
http://xiangce.baidu.com/picture/album/list/f804e84d4e5b9dd3c38f99aa0ecd6a23836c5c40
http://xiangce.baidu.com/picture/album/list/4849aa5a98dfd63d1156324e4d08016a103f03ae
http://xiangce.baidu.com/picture/album/list/156e6a3419b2244cbab37b0fde86e23bb4567c40
http://xiangce.baidu.com/picture/album/list/6e7fa02d47dfe7d3f86ef60f604402c2033323ae

eee4444

老式的不行，新近出的應(yīng)該可以。祝你好運(yùn)！

eee4444

具體我還真的不太懂，太不好意思啦