lambda表达式对map排序

public static > Map sortByValue(Map map, boolean asc) 
    {
        Map result = new LinkedHashMap<>();
        Stream> stream = map.entrySet().stream();    
		if (asc) //升序
		{
			 //stream.sorted(Comparator.comparing(e -> e.getValue()))
			stream.sorted(Map.Entry.comparingByValue())
				.forEachOrdered(e -> result.put(e.getKey(), e.getValue()));
		}
		else //降序
		{
			 //stream.sorted(Collections.reverseOrder(Map.Entry.comparingByValue()))
			stream.sorted(Map.Entry.comparingByValue().reversed())
				.forEachOrdered(e -> result.put(e.getKey(), e.getValue()));
		}
        return result;
    }
 
public static , V > Map sortByKey(Map map, boolean asc) 
	{
        Map result = new LinkedHashMap<>();
        Stream> stream = map.entrySet().stream();
        if (asc) 
		{
        	stream.sorted(Map.Entry.comparingByKey())
                .forEachOrdered(e -> result.put(e.getKey(), e.getValue()));
        }
        else 
		{
        	stream.sorted(Map.Entry.comparingByKey().reversed())
            	.forEachOrdered(e -> result.put(e.getKey(), e.getValue()));
		}
	    return result;
	}

https://blog.csdn.net/x_san3/article/details/84329118