Example usage for java.util Map get

Introduction

In this page you can find the example usage for java.util Map get.

Prototype

V get(Object key);

Source Link

Document

Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.

Usage

From source file:Main.java

/**
 * //w  w w  .j  a  v  a 2 s .  c  om
 * pre : resultSet must be a valid List&lt;Map&gt; <br>
 * post : a Map&lt;keyValue, Map&gt;
 * 
 * @param resultSet
 *          result set from sql. no need order by
 * @param key
 *          the key to get the value to be the new key for the returned map
 * @return null if resultSet is null
 */
@SuppressWarnings("rawtypes")
public static Map<Object, Map> sqlListToMapWithUniqueKey(List<Map> resultSet, String key) {

    if (resultSet == null)
        return null;

    Map<Object, Map> rs = new HashMap<Object, Map>(resultSet.size());
    for (Map map : resultSet) {
        rs.put(map.get(key), map);
    }
    return rs;
}

From source file:Main.java

public static <K, V> void addListInMap(Map<K, List<V>> map, K key, V value) {
    List<V> list = map.get(key);
    if (list == null) {
        list = new ArrayList<V>();
        map.put(key, list);//from   w  w w .jav  a2 s .co m
    }
    list.add(value);
}

From source file:Main.java

public static Map<String, String> getFromFsNumber(String fsNumber, List<Map<String, String>> all) {
    for (Map<String, String> o : all) {
        if (o != null && o.get("fsNumber") != null && fsNumber != null) {
            if (o.get("fsNumber").equalsIgnoreCase(fsNumber)) {
                return o;
            }//from  w  w w.jav a  2s.c  o m
        }
    }
    return null;
}

From source file:Main.java

/**
 * Get the value from the map for the given key. It the value does not exist, return the given
 * defaultValue.//from   w  w w .  j  a  v  a2s  .  c  o  m
 *
 * @param <K>          key type
 * @param <V>          value type
 * @param map          map
 * @param key          key
 * @param defaultValue default value if the value is null.
 * @return value
 */
public static <K, V> V getValue(Map<K, V> map, K key, V defaultValue) {
    V v = map.get(key);
    if (v == null) {
        return defaultValue;
    }
    return v;
}

From source file:Main.java

public static <K, V> void addToMapSet(K key, V value, Map<K, Set<V>> map) {

    Set<V> set = map.get(key);
    if (set == null) {
        set = new HashSet<V>();
        map.put(key, set);/*from   w w w . jav a 2 s .  c om*/
    }
    set.add(value);
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static <K, V> V getOrDefault(Map<K, ?> map, K key, V defaultValue) {
    final Object v = map.get(key);
    if (v == null)
        return defaultValue;
    else/*from   w w w  .j  a  v a2  s  . com*/
        return (V) v;
}

From source file:Main.java

public static byte[] getPublicKey(Map<String, Object> keyMap) throws Exception {
    Key key = (Key) keyMap.get(PUBLIC_KEY);
    return key.getEncoded();
}

From source file:Main.java

public static <K, V> void findInMultimap(Map<K, List<V>> map, K key, List<V> result) {
    List<V> tmp = map.get(key);
    if (tmp != null)
        result.addAll(tmp);/*from  w w w  .java  2  s.  c  om*/
}

From source file:Main.java

public static <T> Integer changeValue(Map<T, Integer> map, T key, int value) {
    Integer integer = map.get(key);
    if (integer != null) {
        integer += value;/*from w  w  w .ja  v a2s.c om*/
        map.put(key, integer);
    }

    return integer;
}

From source file:Main.java

private static int getFreq(final Object obj, final Map freqMap) {
    Integer count = (Integer) freqMap.get(obj);
    if (count != null) {
        return count;
    }/*w  ww .  j  a  v  a  2  s  .  co m*/
    return 0;
}