ObjectHolder to get out assoiciated with strings objects from tagged map

ObjectsHolder.java

package commandline.commands;

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

/**
 * Created by Сергій Шнуренко on 15.11.2015.
 */
public class ObjectsHolder {
    private Map<String,Object> pairs;

    private static ObjectsHolder instance = new ObjectsHolder();

    private ObjectsHolder(){
        pairs = new HashMap<String,Object>();
    }

    public static ObjectsHolder getInstance(){
        return instance;
    }

    public void put(String key, Object value){
        pairs.put(key,value);
    }

    public Object get(String key){
        for(Map.Entry<String,Object> entry:pairs.entrySet()) {
            if (entry.getKey().equals(key)) {
                return entry.getValue();
            }
        }
        //if no associated with this key value
        return null;
    }


}