Java : SortedMap con ejemplos
SortedMap (Java SE 23 & JDK 23) en Java con ejemplos.
Encontrará muestras de código para la mayoría de los métodos SortedMap<K,V>.
Nota :
- Este artículo puede utilizar software de traducción para su comodidad. Consulte también la versión original en inglés.
Summary
final SortedMap<String, Integer> sortedMap = new TreeMap<>();
sortedMap.put("ccc", 10);
sortedMap.put("ddd", 20);
sortedMap.put("aaa", 30);
sortedMap.put("bbb", 40);
System.out.println(sortedMap); // {aaa=30, bbb=40, ccc=10, ddd=20}
final var hashMap = new HashMap<String, Integer>();
hashMap.put("ccc", 10);
hashMap.put("ddd", 20);
hashMap.put("aaa", 30);
hashMap.put("bbb", 40);
System.out.println(hashMap); // {aaa=30, ccc=10, bbb=40, ddd=20}
Methods
Comparator<? super K> comparator ()
final SortedMap<String, Integer> map = new TreeMap<>();
System.out.println(map); // {}
final var comparator = map.comparator();
System.out.println(comparator); // null
final SortedMap<String, Integer> map = new TreeMap<>(Comparator.reverseOrder());
System.out.println(map); // {}
final var comparator = map.comparator();
System.out.println(comparator.equals(Comparator.reverseOrder())); // true
final SortedMap<String, Integer> map = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
System.out.println(map); // {}
final var comparator = map.comparator();
System.out.println(comparator.equals(String.CASE_INSENSITIVE_ORDER)); // true
Set<Map.Entry<K,V>> entrySet ()
final SortedMap<String, Integer> map = new TreeMap<>();
map.put("a", 1);
map.put("b", 2);
map.put("c", 3);
System.out.println(map); // {a=1, b=2, c=3}
final var entries = map.entrySet();
System.out.println(entries); // [a=1, b=2, c=3]
map.replace("b", 20);
System.out.println(map); // {a=1, b=20, c=3}
System.out.println(entries); // [a=1, b=20, c=3]
entries.remove(Map.entry("a", 1));
System.out.println(map); // {b=20, c=3}
System.out.println(entries); // [b=20, c=3]
for (final var entry : entries) {
entry.setValue(entry.getValue() * 10);
}
System.out.println(map); // {b=200, c=30}
System.out.println(entries); // [b=200, c=30]
K firstKey ()
final SortedMap<String, Integer> map = new TreeMap<>();
System.out.println(map); // {}
map.put("b", 20);
System.out.println(map); // {b=20}
System.out.println(map.firstKey()); // b
map.put("c", 30);
System.out.println(map); // {b=20, c=30}
System.out.println(map.firstKey()); // b
map.put("a", 10);
System.out.println(map); // {a=10, b=20, c=30}
System.out.println(map.firstKey()); // a
final SortedMap<String, Integer> map = new TreeMap<>();
System.out.println(map); // {}
try {
map.firstKey();
} catch (NoSuchElementException e) {
System.out.println("NoSuchElementException!");
}
// Result
// ↓
//NoSuchElementException!
SortedMap<K,V> headMap (K toKey)
final SortedMap<String, Integer> map = new TreeMap<>();
map.put("x", 10);
map.put("y", 20);
map.put("z", 30);
System.out.println(map); // {x=10, y=20, z=30}
final var headMap = map.headMap("z");
System.out.println(headMap); // {x=10, y=20}
map.put("a", 40);
System.out.println(map); // {a=40, x=10, y=20, z=30}
System.out.println(headMap); // {a=40, x=10, y=20}
headMap.remove("x");
System.out.println(map); // {a=40, y=20, z=30}
System.out.println(headMap); // {a=40, y=20}
final SortedMap<String, Integer> map = new TreeMap<>();
map.put("a", 10);
map.put("b", 20);
map.put("c", 30);
System.out.println(map); // {a=10, b=20, c=30}
System.out.println(map.headMap("a")); // {}
System.out.println(map.headMap("b")); // {a=10}
System.out.println(map.headMap("c")); // {a=10, b=20}
System.out.println(map.headMap("d")); // {a=10, b=20, c=30}
Set<K> keySet ()
final SortedMap<String, Integer> map = new TreeMap<>();
map.put("a", 1);
map.put("b", 2);
map.put("c", 3);
System.out.println(map); // {a=1, b=2, c=3}
final var keys = map.keySet();
System.out.println(keys); // [a, b, c]
map.put("d", 4);
System.out.println(map); // {a=1, b=2, c=3, d=4}
System.out.println(keys); // [a, b, c, d]
keys.remove("a");
System.out.println(map); // {b=2, c=3, d=4}
System.out.println(keys); // [b, c, d]
K lastKey ()
final SortedMap<String, Integer> map = new TreeMap<>();
System.out.println(map); // {}
map.put("b", 20);
System.out.println(map); // {b=20}
System.out.println(map.lastKey()); // b
map.put("a", 10);
System.out.println(map); // {a=10, b=20}
System.out.println(map.lastKey()); // b
map.put("c", 30);
System.out.println(map); // {a=10, b=20, c=30}
System.out.println(map.lastKey()); // c
final SortedMap<String, Integer> map = new TreeMap<>();
System.out.println(map); // {}
try {
map.lastKey();
} catch (NoSuchElementException e) {
System.out.println("NoSuchElementException!");
}
// Result
// ↓
//NoSuchElementException!
default V putFirst (K k, V v)
final SortedMap<String, Integer> map = new TreeMap<>();
System.out.println(map); // []
try {
map.putFirst("a", 10);
} catch (UnsupportedOperationException e) {
System.out.println("UnsupportedOperationException!");
}
// Result
// ↓
//UnsupportedOperationException!
default V putLast (K k, V v)
final SortedMap<String, Integer> map = new TreeMap<>();
System.out.println(map); // []
try {
map.putLast("a", 10);
} catch (UnsupportedOperationException e) {
System.out.println("UnsupportedOperationException!");
}
// Result
// ↓
//UnsupportedOperationException!
default SortedMap<K,V> reversed ()
final SortedMap<String, Integer> map = new TreeMap<>();
map.put("a", 10);
map.put("b", 20);
map.put("c", 30);
System.out.println(map); // {a=10, b=20, c=30}
final var reversedMap = map.reversed();
System.out.println(reversedMap); // {c=30, b=20, a=10}
System.out.println(reversedMap.reversed()); // {a=10, b=20, c=30}
SortedMap<K,V> subMap (K fromKey, K toKey)
final SortedMap<String, Integer> map = new TreeMap<>();
map.put("x", 10);
map.put("y", 20);
map.put("z", 30);
System.out.println(map); // {x=10, y=20, z=30}
final var subMap = map.subMap("a", "z");
System.out.println(subMap); // {x=10, y=20}
map.put("a", 40);
System.out.println(map); // {a=40, x=10, y=20, z=30}
System.out.println(subMap); // {a=40, x=10, y=20}
subMap.remove("x");
System.out.println(map); // {a=40, y=20, z=30}
System.out.println(subMap); // {a=40, y=20}
final SortedMap<String, Integer> map = new TreeMap<>();
map.put("a", 10);
map.put("b", 20);
map.put("c", 30);
System.out.println(map); // {a=10, b=20, c=30}
System.out.println(map.subMap("a", "a")); // {}
System.out.println(map.subMap("a", "b")); // {a=10}
System.out.println(map.subMap("a", "c")); // {a=10, b=20}
System.out.println(map.subMap("a", "d")); // {a=10, b=20, c=30}
System.out.println(map.subMap("a", "d")); // {a=10, b=20, c=30}
System.out.println(map.subMap("b", "d")); // {b=20, c=30}
System.out.println(map.subMap("c", "d")); // {c=30}
System.out.println(map.subMap("d", "d")); // {}
SortedMap<K,V> tailMap (K fromKey)
final SortedMap<String, Integer> map = new TreeMap<>();
map.put("a", 10);
map.put("b", 20);
map.put("c", 30);
System.out.println(map); // {a=10, b=20, c=30}
final var tailMap = map.tailMap("b");
System.out.println(tailMap); // {b=20, c=30}
map.put("d", 40);
System.out.println(map); // {a=10, b=20, c=30, d=40}
System.out.println(tailMap); // {b=20, c=30, d=40}
tailMap.remove("b");
System.out.println(map); // {a=10, c=30, d=40}
System.out.println(tailMap); // {c=30, d=40}
final SortedMap<String, Integer> map = new TreeMap<>();
map.put("a", 10);
map.put("b", 20);
map.put("c", 30);
System.out.println(map); // {a=10, b=20, c=30}
System.out.println(map.tailMap("a")); // {a=10, b=20, c=30}
System.out.println(map.tailMap("b")); // {b=20, c=30}
System.out.println(map.tailMap("c")); // {c=30}
System.out.println(map.tailMap("d")); // {}
Collection<V> values ()
final SortedMap<String, Integer> map = new TreeMap<>();
map.put("a", 1);
map.put("b", 2);
map.put("c", 3);
System.out.println(map); // {a=1, b=2, c=3}
final var values = map.values();
System.out.println(values); // [1, 2, 3]
map.replace("b", 20);
System.out.println(map); // {a=1, b=20, c=3}
System.out.println(values); // [1, 20, 3]
values.remove(1);
System.out.println(map); // {b=20, c=3}
System.out.println(values); // [20, 3]
try {
values.add(4);
} catch (UnsupportedOperationException e) {
System.out.println("UnsupportedOperationException!");
}
// Result
// ↓
//UnsupportedOperationException!
Methods declared in Map
clear, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, equals, forEach, get, getOrDefault, hashCode, isEmpty, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, replaceAll, size
Consulte el siguiente enlace.
Methods declared in SequencedMap
firstEntry, lastEntry, pollFirstEntry, pollLastEntry, sequencedEntrySet, sequencedKeySet, sequencedValues
Consulte el siguiente enlace.
Related posts
- Ejemplos de API