使用 lambda 和流按值对地图进行排序
I'm new to Java 8, not sure how to use streams and it's methods to sort. If I have map as below, how to sort this map by value to take only top 10 entries using Java 8.
HashMap<String, Integer> map = new HashMap<String, Integer>();
map.put("a", 10);
map.put("b", 30);
map.put("c", 50);
map.put("d", 40);
map.put("e", 100);
map.put("f", 60);
map.put("g", 110);
map.put("h", 50);
map.put("i", 90);
map.put("k", 70);
map.put("L", 80);
I know before Java 8, we can sort as this link: https://stackoverflow.com/a/109389/4315608
解决方案You can always start reading the documentation and some tutorials.
map.entrySet().stream()
.sorted(Map.Entry.<String, Integer>comparingByValue().reversed())
.limit(10)
.forEach(System.out::println); // or any other terminal method
Reference
http://www.leveluplunch.com/java/examples/sort-order-map-by-values/
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