建立一个C++ Console, 做一个篮球队员的信息系统,虽然是C++,但我的问题Java也可以回答
Number Position Name
---------- ---------- ----------
5 Center ABC
1 Guard DEF
9 Forward GHI
需要有 AddPlayer(), DeletePlayer(), Display(),
我创建了2个类,一个是class PlayerDataBase ,一个是class Player以上我都完成了,就是在遇到如何排序的时候遇到了问题,共有3种排序要求
SortByNumber(), SortByPosition(), SortByName(), 每一种都会按照不同的
要求输出相应的内容
现在我的思路是:
把球员信息存入vector中 然后push_back进入PlayerDataBase中,可是还是感觉很迷惑。请问我该用什么方法,数据结构?谢谢大家
Number Position Name
---------- ---------- ----------
5 Center ABC
1 Guard DEF
9 Forward GHI
需要有 AddPlayer(), DeletePlayer(), Display(),
我创建了2个类,一个是class PlayerDataBase ,一个是class Player以上我都完成了,就是在遇到如何排序的时候遇到了问题,共有3种排序要求
SortByNumber(), SortByPosition(), SortByName(), 每一种都会按照不同的
要求输出相应的内容
现在我的思路是:
把球员信息存入vector中 然后push_back进入PlayerDataBase中,可是还是感觉很迷惑。请问我该用什么方法,数据结构?谢谢大家
只不过是传给order by 子句的条件不同罢了,有何问题列?
如果存在一个Vector中,每次sort后顺序都改变了,也就是说每次都需要重新排序。
建议你保存三个排好序的结果在三个Vecotr(或List)中,这样排序结果可重用。
相应的,三个方法为:getListOrderByNumber(),getListOrderByPosition(),getListOrderByName()。
为保证排序结果一直有效,在插入和删除队员数据的时候,同时更新维护这三个列表
http://www.blogjava.net/zygcs/archive/2008/01/17/176032.html
如果只要求按某种 字符集 的字典顺序来排序,在Java中, 四楼的做法就可以了(Java采用的是Unicode字符顺序);
如果排序需要支持 国际化、排序的强度、分解,在Java中,Collator类提供了支持;所以楼主只需实现或找个已有实现的C++排序器即可;C++中没有排序器?Java 示例:import java.text.Collator;
import java.util.Collections;
import java.util.Comparator;
import java.util.Locale;
import java.util.Vector;public class PlayerUtil { static Collator collator = Collator.getInstance(Locale.CHINA);
static{
collator.setStrength(Collator.SECONDARY);
collator.setDecomposition(Collator.NO_DECOMPOSITION);
}
/**
* 根据球队队员Name排序,对大小不敏感
*
* @param players
*/
public static void sortByName(Vector<Player> players){
if(players == null || players.isEmpty()) return;
Collections.sort(players, new Comparator<Player>() {
@Override
public int compare(Player player1, Player player2) {
return collator.compare(player1.getName(), player2.getName());
}
});
}
/**
* 根据球队队员Number排序,按字典顺序排序
*
* @param players
*/
public static void sortByNumber(Vector<Player> players){
if(players == null || players.isEmpty()) return;
Collections.sort(players, new Comparator<Player>() {
@Override
public int compare(Player player1, Player player2) {
return player1.getNumber().compareTo(player2.getNumber());
}
});
}
/**
* 根据球队队员Position排序,对大小不敏感
*
* @param players
*/
public static void sortByPosition(Vector<Player> players){
if(players == null || players.isEmpty()) return;
Collections.sort(players, new Comparator<Player>() {
@Override
public int compare(Player player1, Player player2) {
return collator.compare(player1.getPosition(), player2.getPosition());
}
});
}
/**
* 打印结果
*
* @param players
*/
public static void display(Vector<Player> players){
if(players == null || players.isEmpty()) return;
for(Player player : players){
System.out.println(player);
}
}
public static void main(String[] args) {
Vector<Player> players = new Vector<Player>();
players.add(new Player(5,"Center","ABC"));
players.add(new Player(1,"Guard","DEF"));
players.add(new Player(9,"Forward","GHI"));
players.add(new Player(6,"guard","abc"));
players.add(new Player(4,"FORWARD","Defcf"));
players.add(new Player(2,"Guard","ghif"));
System.out.println("-------------------Sort by Number : ");
PlayerUtil.sortByNumber(players);
PlayerUtil.display(players);
System.out.println("-------------------End");
System.out.println("-------------------Sort by Name : ");
PlayerUtil.sortByName(players);
PlayerUtil.display(players);
System.out.println("-------------------End");
System.out.println("-------------------Sort by Position : ");
PlayerUtil.sortByPosition(players);
PlayerUtil.display(players);
System.out.println("-------------------End");
}
}class Player{
private Integer number;
private String name;
private String position;
public Player(Integer number, String name, String position){
this.number = number;
this.name = name;
this.position = position;
} public Integer getNumber() {
return number;
} public String getName() {
return name;
} public String getPosition() {
return position;
} @Override
public String toString() {
return "Player [number=" + number + ", name=" + name + ", position="
+ position + "]";
}
}
打印结果:-------------------Sort by Number :
Player [number=1, name=Guard, position=DEF]
Player [number=2, name=Guard, position=ghif]
Player [number=4, name=FORWARD, position=Defcf]
Player [number=5, name=Center, position=ABC]
Player [number=6, name=guard, position=abc]
Player [number=9, name=Forward, position=GHI]
-------------------End-------------------Sort by Name :
Player [number=5, name=Center, position=ABC]
Player [number=4, name=FORWARD, position=Defcf]
Player [number=9, name=Forward, position=GHI]
Player [number=1, name=Guard, position=DEF]
Player [number=2, name=Guard, position=ghif]
Player [number=6, name=guard, position=abc]
-------------------End-------------------Sort by Position :
Player [number=5, name=Center, position=ABC]
Player [number=6, name=guard, position=abc]
Player [number=1, name=Guard, position=DEF]
Player [number=4, name=FORWARD, position=Defcf]
Player [number=9, name=Forward, position=GHI]
Player [number=2, name=Guard, position=ghif]
-------------------End