lambda testing

import java.util.Comparator;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import java.util.TreeSet;
import java.util.function.BiFunction;

public class Tester {
	
	public static void main(String[] args) throws Exception{
		
		BiFunction<Integer, Integer, Integer> myComparator = (x,y) -> x-y;
		Map<Integer, String> map3 = new TreeMap<>(myComparator);
	}
	

}