apache commons collections

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

import junit.framework.TestCase;

import org.apache.commons.collections.CollectionUtils;

public class MapSubstractTest extends TestCase{
 
 public void testSubstract(){
  Map<String,String> source = new HashMap<String,String>();
  source.put("소주","삼겹살");
  source.put("양주","과일");
  source.put("맥주","감자튀김");
  source.put("고량주","물초면");
  Map<String,String> blackList = new HashMap<String,String>();
  blackList.put("고량주","물초면");
  Collection<Map.Entry> filetered = CollectionUtils.subtract(source.entrySet(),blackList.entrySet());
  System.out.println(filetered);
 }
}