public?class?Test01 {

?

public?static?void?main(String[] args) {

?

String str?= "If you want to change your fate I think you must come to the ujiuye to learn java";

String[] strS?= str.split(" ");

Map<String, Integer> hMap?= new?HashMap<String, Integer>();

for?(int?i?= 0; i?< strS.length; i++) {

String s?= strS[i];

if?(hMap.get(s) == null) {

hMap.put(s, 1);

}else?{

hMap.put(s, hMap.get(s)+1);

}

}

System.out.println(hMap);

//{think=1, fate=1, ujiuye=1, learn=1, want=1, change=1, I=1, come=1, your=1, the=1, java=1, must=1, to=3, If=1, you=2}

}

}

public?class?Test02 {

?

public?static?void?main(String[] args) {

?

List<String> list?= new?ArrayList<String>();

list.add("張三豐,北京");

list.add("李四豐,上海");

list.add("王二小,北京");

list.add("小明,河北");

list.add("小毛,北京");

list.add("王五,北京"); ??

Map<String, Integer> hMapCount?= new?HashMap<>();

Map<String, String> hMapNames?= new?HashMap<>();

?

for?(String str?: list) {

String[] strS?= str.split(",");

String s?= strS[1];

if?(hMapCount.get(s) == null) {

hMapCount.put(s, 1);

hMapNames.put(s, strS[0]);

}else?{

hMapCount.put(s, hMapCount.get(s)+1);

hMapNames.put(s, hMapNames.get(s) +" "+ strS[0]);

}

}

Set<String> set?= hMapCount.keySet();

for?(String string?: set) {

System.out.println(string+" "+hMapCount.get(string)+"人"+ " "+hMapNames.get(string));

}

/*

?* 上海 1人 李四豐

河北 1人 小明

北京 4人 張三豐 王二小 小毛 王五

?*/

}

?

}

package?com.henu;

?

import?java.util.ArrayList;

import?java.util.HashMap;

import?java.util.List;

import?java.util.Map;

import?java.util.Map.Entry;

import?java.util.Set;

?

public?class?Demo_mapgetkeybyvalue {

public?static?void?main(String[] args) {

?

Map<String, String> hMap?= new?HashMap<String, String>();

hMap.put("111", "aaa");

hMap.put("222", "bbb");

hMap.put("333", "aaa");

hMap.put("444", "ddd");

hMap.put("555", "aaa");

hMap.put("666", "eee");

String value?= "aaa";

System.out.println(mapGetKeyByValue(hMap, value));

}

?

public?static?List<String> mapGetKeyByValue(Map<String, String> hMap,String value){

?

Set<Entry<String, String>> hSet?= hMap.entrySet();

List<String> list?= new?ArrayList<String>();

?

for?(Entry<String, String> entry?: hSet) {

String k?= entry.getKey();

String v?= entry.getValue();

if?(v.equals(value)) {

list.add(k);

}

}

?

return?list;

?

}

?

}

?

package?com.henu;

?

import?java.util.ArrayList;

import?java.util.Collections;

import?java.util.HashMap;

import?java.util.List;

import?java.util.Map;

?

public?class?Demo04_斗地主_制牌_洗牌_發牌_有序 {

?

public?static?void?main(String[] args) {

?

String[] nums?= {"3","4","5","6","7","8","9","10","J","Q","K","A","2"};

String[] color?= {"?","?","?","?"};

//定義map存儲所有牌，采用它的key為后期的每個人的手牌排序做準備

Map<Integer, String> hMap?= new?HashMap<>();

//list存取序號，相當于map的key值。

List<Integer> cardId?= new?ArrayList<Integer>();

int?count?= 1;

//雙重循環將牌存入到map中，注意外內循環的不同數組，為了后續的排序

for?(String str1?: nums) {

for?(String str2?: color) {

cardId.add(count);

hMap.put(count++, str2+str1);

}

}

hMap.put(53, "小?");

hMap.put(54, "大?");

cardId.add(53);

cardId.add(54);

?

//將牌的序號進行打亂

Collections.shuffle(cardId);

?

//定義三個玩家

List<Integer> xiaoTeng?= new?ArrayList<>();

List<Integer> xiaoYun?= new?ArrayList<>();

List<Integer> xiaoHong?= new?ArrayList<>();

List<Integer> diPai?= new?ArrayList<>();

?

//發牌

for?(int?i?= 0; i?< cardId.size(); i?+= 3) {

?

if?(i?< cardId.size()-3) {

xiaoTeng.add(cardId.get(i));

xiaoYun.add(cardId.get(i+1));

xiaoHong.add(cardId.get(i+2));

}else?{

diPai.add(cardId.get(i-1));

diPai.add(cardId.get(i));

diPai.add(cardId.get(i+1));

}

}

?

//輸出結果

System.out.println("小騰的牌是："+toCard(xiaoTeng, hMap));

System.out.println("小云的牌是："+toCard(xiaoYun, hMap));

System.out.println("小宏的牌是："+toCard(xiaoHong, hMap));

System.out.println("底牌的牌是："+toCard(diPai, hMap));

?

?

}

//根據list的序號取map的value;即根據序號對map的 牌進行取，得到的即是排序好的紙牌。

public?static?List<String> toCard(List<Integer> user,Map<Integer, String> hMap){

//現將抽到的牌進行排序

Collections.sort(user);

//根據序號取到牌

List<String> userCard?= new?ArrayList<>();

for?(Integer in?: user) {

userCard.add(hMap.get(in));

}

?

return?userCard;

?

}

?

}

?

?