importjava.util.Comparator;importjava.util.TreeMap;publicclassCustomComparatorExample{publicstaticvoidmain(String[]args){TreeMap<String,Integer>treeMap=newTreeMap<>(newCustomComparator());treeMap.put("apple",1);treeMap.put("banana",2);treeMap.put("orange",3);System.out.println(treeMap);}}cla...
comparator()); else if (cls == ConcurrentHashMap.class) return new ConcurrentHashMap<>(((Map)map).size()); return null; } 代码示例来源:origin: google/guava public void testTreeMapWithComparator() { TreeMap<Integer, Integer> map = Maps.newTreeMap(SOME_COMPARATOR); assertEquals(Collections...
(See Comparable or Comparator for a precise definition of <em>consistent with equals</em>.) This is so because the Map interface is defined in terms of the equals operation, but a sorted map performs all key comparisons using its compareTo (or compare) method, so two keys that are ...
ClassCastException - if the specified key cannot be compared with the keys currently in the map NullPointerException - if the specified key is null and this map uses natural ordering, or its comparator does not permit null keys Since: 1.6 floorEntry public Map.Entry<K,V> floorEntry(K key)...
###CustomComparator package main import ( "fmt" "github.com/emirpasic/gods/sets/treeset" ) type User struct { id int name string } // Comparator function (sort by IDs) func byID(a, b interface{}) int { // Type assertion, program will panic if this is not respected c1 := a.(Us...
###CustomComparator package main import ( "fmt" "github.com/emirpasic/gods/sets/treeset" ) type User struct { id int name string } // Comparator function (sort by IDs) func byID(a, b interface{}) int { // Type assertion, program will panic if this is not respected c1 := a.(Us...
(See Comparable or Comparator for a precise definition of <em>consistent with equals</em>.) This is so because the Map interface is defined in terms of the equals operation, but a sorted map performs all key comparisons using its compareTo (or compare) method, so two keys that are ...
(See Comparable or Comparator for a precise definition of <em>consistent with equals</em>.) This is so because the Map interface is defined in terms of the equals operation, but a sorted map performs all key comparisons using its compareTo (or compare) method, so two keys that are ...
Note that the ordering maintained by a tree map, like any sorted map, and whether or not an explicit comparator is provided, must be consistent with equals if this sorted map is to correctly implement the Map interface. (See Comparable or Comparator for a precise definition of consistent with...
3. Custom Sorting inTreeMap If we're not satisfied with the natural ordering ofTreeMap, we can also define our own rule for ordering by means of a comparator during construction of a tree map. In the example below, we want the integer keys to be ordered in descending order: ...