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 <V> void appendMaps(Map<Integer, V> A, Map<Integer, V> B) {
    int index = A.size();
    for (int i : B.keySet()) {
        A.put(index, B.get(i));//from  w  w  w . java 2  s  .c  o  m
        index++;
    }
}

From source file:Main.java

final static public boolean isEmpty(Map map) {
    return map == null || map.size() == 0;
}

From source file:Main.java

public static <K, V> Map<K, V> clone(Map<K, V> map1) {
    Map<K, V> map2 = new HashMap<K, V>(map1.size());
    for (Map.Entry<K, V> e : map1.entrySet()) {
        map2.put(e.getKey(), e.getValue());
    }/* www  .ja  v  a  2  s . c om*/
    return map2;
}

From source file:Main.java

public static boolean isNonEmpty(Map map) {
    return (map != null && map.size() > 0);
}

From source file:Main.java

static int[] getSwitchKeys(Map buckets) {
    int[] keys = new int[buckets.size()];
    int index = 0;
    for (Iterator it = buckets.keySet().iterator(); it.hasNext();) {
        keys[index++] = ((Integer) it.next()).intValue();
    }//from w  w  w  .java 2 s .  co m
    Arrays.sort(keys);
    return keys;
}

From source file:Main.java

public static boolean isNotEmpty(Map<?, ?> map) {

    if (null != map && map.size() > 0)
        return true;
    return false;
}

From source file:Main.java

/**
 * is null or its size is 0/*  w  ww . ja v a 2s .  c  o m*/
 * 
 * <pre>
 * isEmpty(null)   =   true;
 * isEmpty({})     =   true;
 * isEmpty({1, 2})    =   false;
 * </pre>
 * 
 * @param sourceMap
 * @return if map is null or its size is 0, return true, else return false.
 */
public static <K, V> boolean isEmpty(Map<K, V> sourceMap) {
    return (sourceMap == null || sourceMap.size() == 0);
}

From source file:Main.java

private static void addProperty(HttpURLConnection connection, Map<String, String> headers) {
    if (headers == null || headers.size() == 0) {
        return;/*from  w w  w . j  av  a2 s . c  om*/
    }
    for (Map.Entry<String, String> entry : headers.entrySet()) {
        connection.addRequestProperty(entry.getKey(), entry.getValue());
    }
}

From source file:Main.java

public static void trimMap(Map map, int numberOfElements) {
    if (map.size() < numberOfElements) {
        return;//from ww w  .ja  v  a2  s .  c  o m
    }

    numberOfElements = map.size() - numberOfElements;
    Iterator it = map.entrySet().iterator();
    int counter = 0;

    while (it.hasNext()) {
        if (counter <= numberOfElements) {
            it.next();
            counter++;
        }
        it.remove();
    }
}

From source file:Main.java

public static <K, V> int size(final Map<K, V> map) {
    return map == null ? 0 : map.size();
}