Example usage for java.util Collection size

Introduction

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

Prototype

int size();

Source Link

Document

Returns the number of elements in this collection.

Usage

From source file:Main.java

/**
 * Converts a Collection containing java.io.File instanced into array
 * representation. This is to account for the difference between
 * File.listFiles() and FileUtils.listFiles().
 *
 * @param files a Collection containing java.io.File instances
 * @return an array of java.io.File//from ww w.j  a  v  a 2s.  c om
 */
public static File[] convertFileCollectionToFileArray(Collection<File> files) {
    return files.toArray(new File[files.size()]);
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static final boolean isEmpty(Collection c) {
    return null == c || 0 == c.size() ? true : false;
}

From source file:Main.java

public static boolean isTheSame(Collection a, Collection b) {
    int sizeA = a == null ? 0 : a.size();
    int sizeB = b == null ? 0 : b.size();
    if (sizeA == sizeB && sizeA != 0) {
        int matchCount = 0;
        for (Object obj : a) {
            if (b.contains(obj)) {
                matchCount++;/*from w  w w.ja v a  2  s.  c om*/
            }
        }
        return matchCount == b.size();
    } else {
        return sizeA == 0;
    }
}

From source file:Main.java

@SuppressWarnings("rawtypes")
public static final boolean isEmpty(Collection c) {
    return null == c || 0 == c.size() ? true : false;
}

From source file:Main.java

/**
 * Returns true if both collections contain the same elements and the elements are in the same order.
 * Note that the start elements do not have to be the equal!
 * @param s1 The first collection//  ww w  .j a  v a 2s .co  m
 * @param s2 The second collection
 * @return true if s1 and s2 are same in the sense explained above. 
 */
public static boolean sameElementsSameOrder(Collection<?> s1, Collection<?> s2) {
    if (s1.size() != s2.size())
        return false;

    Iterator<?> it1 = s1.iterator();
    Object first = it1.next();
    for (Iterator<?> it2 = s2.iterator(); it2.hasNext();) {
        if (it2.next().equals(first)) {
            while (it1.hasNext()) {
                if (!it2.hasNext())
                    it2 = s2.iterator();
                if (!it1.next().equals(it2.next()))
                    return false;
            }
            return true;
        }
    }
    return false;
}

From source file:Main.java

/**
 * Concatenate the collection of lists passed as argument into a new array list.
 * @param lists/*from  w ww  .j  a v  a 2 s  .c  o m*/
 * @param <T>
 * @return
 */
public static <T> List<T> concat(Collection<? extends Collection<T>> lists) {
    int size = 0;
    for (Collection<T> list : lists) {
        size += list.size();
    }
    List<T> result = new ArrayList<T>(size);
    for (Collection<T> list : lists) {
        result.addAll(list);
    }
    return result;
}

From source file:Main.java

public static <T> String[] addSuffix(Collection<T> col, String suffix) {

    String[] result = new String[col.size()];

    int index = 0;
    for (T e : col) {
        result[index++] = e.toString() + suffix;
    }//  w ww  .  j  av a2s .  c o m

    return result;

}

From source file:Main.java

public static <T> int size(final Collection<T> collection) {
    return collection == null ? 0 : collection.size();
}

From source file:Main.java

/**
 * Check if collection contains element.
 * @return true: null == collection || 0 == collection.size()
 * @return false: null != collection && 0 != collection.size()
 *//*from  w  w w  . ja  va 2  s .c  om*/
public static boolean isBlank(Collection<? extends Object> collection) {
    if (null == collection || 0 == collection.size()) {
        return true;
    }
    return false;
}

From source file:Main.java

public static boolean isNullOrEmpty(Collection c) {
    boolean isNullOrEmpty = false;
    if (null == c || c.size() == 0) {
        isNullOrEmpty = true;/*from  w  w w .  j a va  2 s  . c  o  m*/
    }
    return isNullOrEmpty;
}