java优化策略：hashMap内存初始化加载优化

package com.gsafety.opinion.pc.util;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.annotation.PostConstruct;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import com.gsafety.opinion.pc.mapper.CountriesMapper;
import com.gsafety.opinion.pc.mapper.EventTypeMapper;
import com.gsafety.opinion.pc.mapper.LocationPlaceMapper;
import com.gsafety.opinion.pc.po.Countries;
import com.gsafety.opinion.pc.po.EventType;
import com.gsafety.opinion.pc.po.LocationPlace;

@Component
public class POCacheUtils {
    
    public static Map<String,Countries> countriesMap = new HashMap<String,Countries>();
    
    public static Map<String,LocationPlace> locationPlacesMap = new HashMap<String,LocationPlace>();
    
    public static Map<String,EventType> eventTypeCodeMap = new HashMap<String,EventType>();
    
    public static Map<String,EventType> eventTypeNameMap = new HashMap<String,EventType>();
    
    @Autowired
    private CountriesMapper countriesMapper;
    
    @Autowired
    private LocationPlaceMapper locationPlaceMapper;
    
    @Autowired
    private EventTypeMapper eventTypeMapper;
    
    @PostConstruct
    public void init(){
        List<Countries> countries=countriesMapper.queryAll();        
        for(Countries tr:countries){
            countriesMap.put(tr.getCode(), tr);
            
        }
        List<LocationPlace> locationPlace=locationPlaceMapper.queryAll();
        for(LocationPlace tr:locationPlace){
            locationPlacesMap.put(tr.getCode(), tr);            
        }
        List<EventType> eventType=eventTypeMapper.queryAll();
        for(EventType tr:eventType){
            eventTypeCodeMap.put(tr.getEventCode(), tr);
            eventTypeNameMap.put(tr.getEventName(), tr);
        }
        //List<EventType> EventTypeNames=eventTypeMapper.queryAllName();
    }
    

}