Example usage for java.util Set size

Introduction

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

Prototype

int size();

Source Link

Document

Returns the number of elements in this set (its cardinality).

Usage

From source file:Main.java

/**
 * @param disorderBoss//from   w w  w .  j  av a2s .com
 * @return
 */
public static <T> List<T> set2List(Set<T> set) {
    List<T> ret = newArrayList(set.size());
    for (T t : set) {
        ret.add(t);
    }
    return ret;
}

From source file:Main.java

public static <T> T getRandomFrom(Set<T> set, Random random) {
    int randomIndex = random.nextInt(set.size());
    Iterator<T> iterator = set.iterator();
    for (int i = 0; i < randomIndex; i++) {
        if (!iterator.hasNext())
            break;
        iterator.next();// w ww .  j a va  2s .  c  om
    }
    return iterator.next();
}

From source file:Main.java

/**
 * Given a set, determine the proper initial size for a new set to hold the same number of values.
 * Specifically we want to account for load size and load factor to prevent immediate resizing.
 *
 * @param original The original set/*from w  ww .ja  va 2  s . c om*/
 *
 * @return The proper size.
 */
public static int determineProperSizing(Set original) {
    return determineProperSizing(original.size());
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static <T> T[] toArray(Set<T> items, Class<T> tClass) {
    if (items == null || items.size() == 0)
        return null;
    int size = items.size();
    try {/*www.  ja  v a  2 s .  c o  m*/
        T[] array = (T[]) Array.newInstance(tClass, size);
        return items.toArray(array);
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
}

From source file:Main.java

public static String encode(Map<String, String> params, String encoding) {
    StringBuilder encodedParams = new StringBuilder();

    try {/*from   www .  j  a  va2  s .  co  m*/
        Set uee = params.entrySet();
        int size = uee.size();
        int index = 0;
        Iterator iterator = uee.iterator();

        while (iterator.hasNext()) {
            Map.Entry entry = (Map.Entry) iterator.next();
            encodedParams.append(URLEncoder.encode((String) entry.getKey(), encoding));
            encodedParams.append('=');
            encodedParams.append(URLEncoder.encode((String) entry.getValue(), encoding));
            ++index;
            if (index < size) {
                encodedParams.append('&');
            }
        }

        return encodedParams.toString();
    } catch (UnsupportedEncodingException e) {
        throw new RuntimeException("Encoding not supported: " + encoding, e);
    }
}

From source file:Main.java

public static <T> List<T> convertSetToList(Set<T> set) {
    List<T> list = new ArrayList<T>();
    if (set != null && set.size() > 0) {
        for (T t : set) {
            list.add(t);//from w w w.  ja  v  a2  s . c o m
        }
    }
    return list;
}

From source file:Main.java

public static Set minus(Set oriSet, Set tarSet) {
    if (oriSet == null || oriSet.size() == 0)
        return oriSet;
    if (tarSet == null || tarSet.size() == 0)
        return oriSet;
    Iterator oriItor = oriSet.iterator();
    Set minusSet = new HashSet();
    while (oriItor.hasNext()) {
        Object oriObj = oriItor.next();
        Iterator tarItor = tarSet.iterator();
        boolean isExist = false;
        while (tarItor.hasNext()) {
            Object tarObj = tarItor.next();
            if (tarObj.equals(oriObj)) {
                isExist = true;// w  w w  .  j av a 2  s  .  c  o  m
                break;
            }
        }
        if (!isExist) {
            minusSet.add(oriObj);
        }

    }
    return minusSet;

}

From source file:Main.java

/**
 * patterns: ["/util//note"]//  w w w .  j  a  v a2  s  . co  m
 * @param Set<String> patterns
 * @return /util/note
 */
public static String first(Set<String> patterns) {
    String str = "";
    if (patterns != null && patterns.size() > 0) {
        Iterator<String> iterator = patterns.iterator();
        while (iterator.hasNext()) {
            str = (String) iterator.next();
            str = str.replaceAll("//", "/");
            break;
        }
    }
    return str;
}

From source file:Main.java

public static Map<? extends Object, ? extends Object> transformSetToMap(Set<? extends Object> objects) {
    Map<Object, Object> map = new HashMap<Object, Object>(objects.size());
    for (Object obj : objects) {
        map.put(obj, obj);//from  w w w. j  a v a  2s.  co m
    }
    return map;
}

From source file:Main.java

public static List toList(Set set) {
    if (set == null) {
        return null;
    }/*from  w  w w . jav  a  2 s.  c  om*/
    if (set.size() == 0)
        return new ArrayList();
    List list = new ArrayList();
    Iterator itor = set.iterator();
    while (itor.hasNext()) {
        Object obj = itor.next();
        list.add(obj);
    }
    return list;
}