拡張可能なコレクションクラス(ループ時間による挿入操作)
3042 ワード
Collections.synchronizedMap:
ConcurrentHashMap: ,
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
*
*/
public class AccessingMap {
private static void userMap(final Map<String, Integer> scores) {
scores.put("Joes", 90);
scores.put("Mike", 85);
try {
for(final String key : scores.keySet()) {
System.out.println(key + " " + scores.get(key));
scores.put("Tom", 99);
}
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
System.out.println("Using HashMap");
userMap(new HashMap<String, Integer>());//
System.out.println("Using synchronized HashMap");
userMap(Collections.synchronizedMap(new HashMap<String, Integer>()));//
System.out.println("Using ConcurrentHashMap");
userMap(new ConcurrentHashMap<String, Integer>());// ,
}
}