Example usage for java.util Map containsKey

Introduction

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

Prototype

boolean containsKey(Object key);

Source Link

Document

Returns true if this map contains a mapping for the specified key.

Usage

From source file:Main.java

public static boolean checkExternalSDExists() {

    Map<String, String> evn = System.getenv();
    return evn.containsKey("SECONDARY_STORAGE");
}

From source file:Main.java

private static final void add(Map<Integer, List<String>> mapTo_addTo, int keyNum, String value) {
    if (mapTo_addTo.containsKey(keyNum)) {
        mapTo_addTo.get(keyNum).add(value);
    } else {/*from  ww w .j ava2  s.co m*/
        List<String> strList = new ArrayList<String>();
        strList.add(value);
        mapTo_addTo.put(keyNum, strList);
    }
}

From source file:Main.java

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

From source file:Main.java

static Node getElementById(Document doc, String id, Map<String, Node> idMap) {
    if (!idMap.containsKey(id)) {
        registerIDs(doc, doc.getDocumentElement(), idMap);
    }/*from www.ja  va 2s. c om*/
    return idMap.get(id);
}

From source file:Main.java

public static Map<Object, Object> get(List<Map<Object, Object>> list, Object key) {

    for (Map<Object, Object> map : list) {
        if (map.containsKey(key)) {

            return map;
        }//  w w w. j  av  a 2  s  .  c o m
    }

    return null;
}

From source file:Main.java

public static <K, V> SortedSet<V> getEntryOrEmptySet(K key, Map<K, SortedSet<V>> map) {
    return (map.containsKey(key) ? map.get(key) : new TreeSet<V>());
}

From source file:Main.java

public static <K> void increaseCount(Map<K, Integer> map, K key, int amount) {
    if (!map.containsKey(key)) {
        map.put(key, 0);/*from w  ww . j a  v  a2  s.c  o m*/
    }

    Integer total = map.get(key);
    total += amount;
    map.put(key, total);
}

From source file:Main.java

public static void decrementLongMap(Map<String, Long> map, String key) {
    if (!map.containsKey(key))
        return;//from   w ww . j  a  va2  s  .  com
    map.put(key, map.get(key) - 1);
}

From source file:Main.java

/**
 * Increase counter.get(key) by increase.
 * If value decrease to zero, it is removed from map.
 *//*  w w  w.java 2s  .c  o m*/
public static <K> void increaseMapCounter(Map<K, Integer> counter, K key, int increase) {
    if (!counter.containsKey(key)) {
        counter.put(key, 0);
    }
    counter.put(key, counter.get(key) + increase);
    if (counter.get(key) == 0) {
        counter.remove(key);
    }
}

From source file:Main.java

public static <T> T getMapValue(Map<? extends Object, T> args, Object key, T defaultValue) {
    if (args.containsKey(key)) {
        return args.get(key);
    } else {//from  w w w .  jav a2  s  .com
        return defaultValue;
    }
}