Example usage for java.util Map size

Introduction

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

Prototype

int size();

Source Link

Document

Returns the number of key-value mappings in this map.

Usage

From source file:Main.java

public static <K, V> List<K> keyToList(Map<K, V> map) {
    return keyToList(map, map.size());
}

From source file:Main.java

public static Object getJsonValue(String jsonStr, String key) {
    Object rulsObj = null;//w  w  w .  ja v a  2s .  c o m
    Map<?, ?> rulsMap = jsonToMap(jsonStr);
    if (rulsMap != null && rulsMap.size() > 0) {
        rulsObj = rulsMap.get(key);
    }
    return rulsObj;
}

From source file:Main.java

@SuppressWarnings("rawtypes")
public static boolean isEmpty(Map map) {
    if (null == map || "".equals(map) || map.size() < 1)
        return true;
    return false;
}

From source file:Main.java

public final static <K, V> Map<K, V> unicon(Map<K, V> map1, Map<K, V> map2) {
    Map<K, V> map = new HashMap<>(map1.size() + map2.size());
    map.putAll(map1);//from  w  ww.  jav  a2s .c  om
    map.putAll(map2);
    return map;
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static <T, U> T[] getKeyArray(Map<T, U> m, Class<T> clazz) {
    if (m == null || m.size() == 0) {
        T[] a = (T[]) java.lang.reflect.Array.newInstance(clazz, 0);
        return Collections.<T>emptyList().toArray(a);
    } else {// ww  w  .  j  a va 2 s  .  com
        T[] a = (T[]) java.lang.reflect.Array.newInstance(clazz, m.size());
        return m.keySet().toArray(a);
    }
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static <T, U> U[] getValueArray(Map<T, U> m, Class<U> clazz) {
    if (m == null || m.size() == 0) {
        U[] a = (U[]) java.lang.reflect.Array.newInstance(clazz, 0);
        return Collections.<U>emptyList().toArray(a);
    } else {// w  w  w  .j av a2s  .c  om
        U[] a = (U[]) java.lang.reflect.Array.newInstance(clazz, m.size());
        return m.values().toArray(a);
    }
}

From source file:Main.java

/**
 * Checks whether the MAP is not NULL and has at least one element.
 * /*from w w  w  .j a  v a 2s.c  om*/
 * @param <T>
 *            the generic type
 * @param <V>
 *            the value type
 * @param map
 *            the map
 * @return true, if successful
 */
public static <T, V> boolean hasElements(Map<T, V> map) {
    return (null != map && map.size() > 0);
}

From source file:Main.java

public static <K> Map<K, String> trimMapValue(Map<K, String> map) {
    Map<K, String> covertedResult = new HashMap<K, String>(map.size());

    Set<Entry<K, String>> entrySet = map.entrySet();
    for (Entry<K, String> entry : entrySet) {
        covertedResult.put(entry.getKey(), entry.getValue().trim());
    }/* w ww .ja  v  a2 s  . c om*/
    return covertedResult;
}

From source file:Main.java

public static void writeStringMap(Map<String, String> map, Parcel parcel) {
    if (map != null && map.size() > 0) {
        parcel.writeInt(map.size());/* ww w  .java 2s.  c  o m*/
        for (Map.Entry<String, String> entry : map.entrySet()) {
            parcel.writeString(entry.getKey());
            parcel.writeString(entry.getValue());
        }
    } else {
        parcel.writeInt(0);
    }
}

From source file:Main.java

@SuppressWarnings("rawtypes")
public static boolean isNotEmpty(Map map) {

    boolean result = false;

    if (null != map && 0 < map.size()) {
        result = true;//from   w  w  w.  j a v a 2s  . c  om
    }

    return result;
}