eee4444(额额额44444)

前沿拓展:

eee4444

手机靓号,通俗讲,即有规律的排列,顺口或有多个重复排列,组合循环等的受欢迎的手机号,当策行亲反家面探但过半然,除以上外还包括吉利数字习俗的重复排列,组合循环错班相赵头部客策题益等,如四连号8888、6666……那在河南办理一个手机四连号需要多少钱呢?下边带您了解。

1、看一些老号码了,保底的高低也是价格浮动的一个缩汉评调养统弦述指费很重要因素。


1、Map概述

1.1 什么是Map

Map是将

3.22.HashMap与Hashtable的异同

除了非同步和允许使用 null 之外,HashMap 类与 Hashtable 大致相同

3.23.HashMap的使用示例

public class HashMapReview {
public static void main(String[] args) {
test1();
test2();
} /**
* 自定义类型做key,
* 需重写其equals和hashCode方法才能保证其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 // 当Info没有重写equals和hashCode方法时,key出现重复元素
} /**
* String或基本数据类型的包装类做key,他们已重写了hashCode与equals方法
* 键唯一,重复添加会替换旧值成新值
*/
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}
// 重复的键不会重新插入,只会替换旧值成新值
} 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 一个HashMap面试题

需求如下:

已知一个HashMap<Integer,Person>**, Person有name(String)和age(int)属性。
请写一个方法实现对HashMap的排序功能。该方法接收HashMap<Integer,Person>为形参,返回类型为HashMap<Integer,Person>,要求对HashMap中的Person的age升序进行排序。排序时key=value键值对不得拆散。

分析:

HashMap本身是不保证元素的顺序不变的,要对其排序可使用LinkedHashMap,它是有序的并且还是HashMap的子类,我们可以使用它来完成排序的目的。最后返回它的实例即可满足要求 并且还符合多态的编程思想

示例代码

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) { // 获得键值对Set**
Set<Entry<Integer, Person>> entrySet = map.entrySet(); // 将键值对Set**转化为List以用Collections来排序
List<Entry<Integer, Person>> list = new ArrayList<Map.Entry<Integer, Person>>(
entrySet); // 通过Collections来排序,添加比较器,比较年龄
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;
}
}); // 创建LinkedHashMap来存储排好序的List元素
LinkedHashMap<Integer, Person> linkedHashMap = new LinkedHashMap<Integer, Person>(); // 遍历List,将元素添加到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/2cc3cd050d-底部咨询-3120c8123409730b8ae
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eee4444

老式的不行,新近出的应该可以。祝你好运!

eee4444

具体我还真的不太懂,太不好意思啦

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