每个对象都缓存到统一的容器中，使用唯一标识获取实例

package com.tiger.singleton;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Created by tiger.
 */
public class SingletonContainer {

   private static Object INSTANCE = null;

    private SingletonContainer(){ }

    private static Map<String,Object> IOC = new ConcurrentHashMap<>();

    public static <T> T getInstance(String className){
        if(!IOC.containsKey(className)){
            try {
                //通过全路径创建实例
                INSTANCE = Class.forName(className).newInstance();
                IOC.put(className, INSTANCE);
            }catch (Exception e){
                e.printStackTrace();
            }
            return (T) INSTANCE;
        }else{
            return (T) IOC.get(className);
        }
    }

    //防止被反序列化破坏单例
    private Object readResolve(){ return INSTANCE;}
}