java : filter list of map sample

package homeWork;
import java.util.ArrayList;

import java.util.Comparator;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.stream.Collectors;
public class filterSample {
	public static void main(String[] args) {

		

		List> countries = new ArrayList>();

		Map country;

		country = new HashMap();

		country.put( "name",       "japan" );

		country.put( "currency",   "JPY" );

		country.put( "population", 127156000 );

		countries.add( country );
		country = new HashMap();

		country.put( "name", "france" );

		country.put( "currency", "EUR" );

		country.put( "population", 65073482 );

		countries.add( country );

		

		country = new HashMap();

		country.put( "name",       "japan" );

		country.put( "currency",   "JPY" );

		country.put( "population", 56000 );

		countries.add( country );


		country = new HashMap();

		country.put( "name", "spain" );

		country.put( "currency", "EUR" );

		country.put( "population", 44904000 );

		countries.add( country );
		country = new HashMap();

		country.put( "name", "russia" );

		country.put( "currency", "RUB" );

		country.put( "population", 141903979 );

		countries.add( country );

		

		for(Mapct:countries) {

			System.out.println(ct.get("name")+":"+ct.get("population"));

		}

		System.out.println("-----------------------");

		

		List> filterdList

			= countries.stream().filter(m -> ( ( Integer ) m.get("population")) < 100000).collect(Collectors.toList());

		

		for(Mapct:filterdList) {

			System.out.println(ct.get("name")+":"+ct.get("population"));	

		}

	}	

}


japan:127156000

france:65073482

japan:56000

spain:44904000

russia:141903979












































-





















japan:56000