Java 如何寻址/访问动态创建的对象?
我尝试处理动态创建的对象,通过方法获取值。 我动态地将对象装箱,并使用一个ArrayList来保存对象名。 我的ArrayList称为ArrayList,列表的值由用户输入(扫描仪)创建,值为f.e.(“Mike”、“Nick”、“John”) 我的班级“球员”:Java 如何寻址/访问动态创建的对象?,java,object,Java,Object,我尝试处理动态创建的对象,通过方法获取值。 我动态地将对象装箱,并使用一个ArrayList来保存对象名。 我的ArrayList称为ArrayList,列表的值由用户输入(扫描仪)创建,值为f.e.(“Mike”、“Nick”、“John”) 我的班级“球员”: public class Player { String playerName = "Player"; int counter1 = 20; int counter2 = 50; public St
public class Player {
String playerName = "Player";
int counter1 = 20;
int counter2 = 50;
public String get_playerName(){
return playerName;
}
public int get_counter1(){
return counter1;
}
public int get_counter2(){
return counter2;
}
public Player(String Name){
playerName = Name;
}
}
这里是我动态创建对象的地方:
int playersCount = arraylist.size(); //Size of ArrayList with Players names
//create Players dynamicly
for(int i = 0; i < playersCount; i++){
Player playerName = new Player(arraylist.get(i));
}
int playersCount=arraylist.size()//带有玩家名称的ArrayList的大小
//动态创建玩家
对于(int i=0;i
如何从Player类中获取特定的Player值(fe:比方说,John正在移动,希望通过get_counter1()获取他的counter1)
如何处理特定的玩家对象
提前感谢大家的回答
Michael听起来您需要一个
HashMap
来存储对您创建的玩家的引用
int playersCount = arraylist.size(); //Size of ArrayList with Players names
Map<String,Player> players = new HashMap<>();
//create Players dynamicly
for(int i = 0; i < playersCount; i++){
Player player = new Player(arraylist.get(i));
players.put (arraylist.get(i), player);
}
您需要将玩家存储在将玩家名称映射到玩家对象的地图中
HashMap<String, Player> mp = new HashMap<String, Player>();
for(int i = 0; i < playersCount; i++){
Player player = new Player(arraylist.get(i));
mp.put(arraylist.get(i), player);
}
// ...
Player p = mp.get("John");
// now use the player John i.e. the p object
HashMap mp=newhashmap();
对于(int i=0;i
如果您只有一个列表,并且您使用的是java 8,那么您可以使用流API按名称(或任何其他属性)查找。这将比使用地图
慢,但您可以更灵活地搜索/Map/etc您的收藏
Optional<Player> optPlayer = arraylist
.stream()
.filter(p -> "John".equals(p.get_playerName()))
.findFirst();
if(optPlayer.isPresent()) {
//player found
Player p = optPlayer.get();
}
可选optPlayer=arraylist
.stream()
.filter(p->“John”.equals(p.get_playerName()))
.findFirst();
if(optPlayer.isPresent()){
//玩家发现
Player p=optPlayer.get();
}
非常感谢!非常适合我。另请参见
Optional<Player> optPlayer = arraylist
.stream()
.filter(p -> "John".equals(p.get_playerName()))
.findFirst();
if(optPlayer.isPresent()) {
//player found
Player p = optPlayer.get();
}