Ejemplo 1: nuevo hashmap java
Map<String, String> myMap = new HashMap<String, String>() {{
put("a", "b");
put("c", "d");
}};
Ejemplo 2: métodos hashmap de Java
import java.util.HashMap; // import the HashMap class
// instantiate a HashMap instance
HashMap<String, String> capitalCities = new HashMap<String, String>();
// SCROLL DOWN FOR LIST OF ALL METHODS --------------------------------------
// to use any methods below add the function name to the instance name
// General Form: HashMapInstanceName.{functionName}({parameter list});
// Specific Example Using the Put Method:
capitalCities.put("California", "Sacramento");
// SCROLL DOWN FOR LIST OF ALL METHODS --------------------------------------
1. void clear()
- Removes all of the mappings from this map.
2. Object clone()
- Returns a shallow copy of this HashMap instance: the keys and values themselves are not cloned.
3. boolean containsKey(Object key)
- Returns true if this map contains a mapping for the specified key.
4. boolean containsValue(Object value)
- Returns true if this map maps one or more keys to the specified value.
5. V get(Object key)
- Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
6. V getOrDefault(Object key, V defaultValue)
- Returns the value to which the specified key is mapped, or defaultValue if this map contains no mapping for the key.
7. boolean isEmpty()
- Returns true if this map contains no key-value mappings.
8. Set<K> keySet()
- Returns a Set view of the keys contained in this map.
9. V put(K key, V value)
- Associates the specified value with the specified key in this map.
10. V remove(Object key)
- Removes the mapping for the specified key from this map if present.
11. boolean remove(Object key, Object value)
- Removes the entry for the specified key only if it is currently mapped to the specified value.
12. V replace(K key, V value)
- Replaces the entry for the specified key only if it is currently mapped to some value.
13. boolean replace(K key, V oldValue, V newValue)
- Replaces the entry for the specified key only if currently mapped to the specified value.
14. int size()
- Returns the number of key-value mappings in this map.
15. Collection<V> values()
- Returns a Collection view of the values contained in this map.
Ejemplo 3: declarar hashmap java
//remember to first import java.util.*; first
//you can swap out string or integer for other data types
Map<String, Integer> d = new HashMap<>();
Ejemplo 4: ejemplo de hashmap de Java
//Hash map creation
Map< String,Integer> hm =
new HashMap< String,Integer>();
//inserting elements into hashmap
hm.put("a", new Integer(100));
hm.put("b", new Integer(200));
hm.put("c", new Integer(300));
hm.put("d", new Integer(400));
Ejemplo 5: declarar un hashmap en java
HashMap<Integer,String> map=new HashMap<Integer,String>();//Creating HashMap
Ejemplo 6: cómo crear un mapa hash en java
HashMap<Integer,String> map=new HashMap<Integer,String>();//key is integer, value is String
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