排序顺序
要以降序排列,只需将 Map.Entry.comparingByValue()
改为 Map.Entry.comparingByValue(Comparator.reverseOrder())
。
方法一:
public class Main {
public static void main(String[] args) {
Map<String, Object> map = new HashMap<>();
map.put("key1", 5);
map.put("key2", 2);
map.put("key3", 8);
map.put("key4", 3);
Map<String, Object> sortedMap = map.entrySet()
.stream()
.sorted(Map.Entry.comparingByValue())
.collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue,
(oldValue, newValue) -> oldValue, LinkedHashMap::new));
System.out.println(sortedMap);
}
}
方法二:
Map<String, BigDecimal> errorValueMap = new HashMap<>(); errorValueMap.put("a",new BigDecimal("1")); errorValueMap.put("w",new BigDecimal("5")); errorValueMap.put("e",new BigDecimal("7")); errorValueMap.put("f",new BigDecimal("9")); List<Entry<String, BigDecimal>> collect = errorValueMap.entrySet().stream().collect(Collectors.toList()); collect.sort(Comparator.comparing(Entry::getValue));