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

public static <T> void resize(Collection<T> collection, int size, T value) {
    if (collection == null)
        return;/* w  ww  .  j  a v  a 2  s  . co m*/

    if (collection.size() < size) {
        //collection.addAll
    }
}

From source file:Main.java

public static int sizeOf(Collection collection) {
    if (collection == null) {
        return 0;
    } else {/*from w w w.  j  av a 2  s . c  o  m*/
        return collection.size();
    }
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static <T> T[] collectionToArray(Collection<T> sourceCollection, Class<?> elementClass) {
    Object array = Array.newInstance(elementClass, sourceCollection.size());
    Iterator iterator = sourceCollection.iterator();
    for (int i = 0; i < sourceCollection.size(); i++) {
        Array.set(array, i, iterator.next());
    }/* ww w.ja v a 2s.  c o m*/
    return (T[]) array;
}

From source file:Main.java

/**
 * Answers true if a predicate is true for at least one element of a
 * collection./*from www .  jav a 2 s  .c om*/
 *
 * @param <T>
 * @param collection - the collection to get the input from, may be null
 * @param value      - value to check
 * @return true if a collection contains specified value.
 */
public static <T> boolean contains(Collection<T> collection, T value) {
    return collection != null && collection.size() > 0 && collection.contains(value);
}

From source file:Main.java

/**
 * Converts collection to a string array by calling toString on each member.
 *
 * @param collection collection to convert
 * @return string array/*from  w  w w .  j  a  v  a 2s. c  o  m*/
 */
public static String[] toStringArray(Collection collection) {
    String[] stringArray = new String[collection.size()];

    int i = 0;
    for (Object string : collection) {
        stringArray[i++] = string.toString();
    }

    return stringArray;
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static <T> T[] toArray(final Collection<T> c, final Class<? extends T[]> newType) {
    final int length = c.size();
    final T[] array = (T[]) Array.newInstance(newType.getComponentType(), length);
    if (length > 0) {
        int i = 0;
        for (T elem : c) {
            array[i++] = elem;//ww  w. j  a v a2s .c o  m
        }
    }
    return array;
}

From source file:Main.java

public static <ELEMENT> ArrayList<ELEMENT> newArrayList(Collection<ELEMENT> elements) {
    final ArrayList<ELEMENT> list = newArrayListSized(elements.size());
    list.addAll(elements);/*from   w  w  w .j  av  a 2 s.  co  m*/
    return list;
}

From source file:Main.java

public static <T> List<T>[] split(Collection<T> set, int n) {
    if (set.size() >= n) {
        @SuppressWarnings("unchecked")
        List<T>[] arrays = new List[n];
        int minSegmentSize = (int) Math.floor(set.size() / (double) n);

        int start = 0;
        int stop = minSegmentSize;

        Iterator<T> it = set.iterator();

        for (int i = 0; i < n - 1; i++) {
            int segmentSize = stop - start;
            List<T> segment = new ArrayList<T>(segmentSize);
            for (int k = 0; k < segmentSize; k++) {
                segment.add(it.next());/*w w  w  .j av  a 2s.  c om*/
            }
            arrays[i] = segment;
            start = stop;
            stop += segmentSize;
        }

        int segmentSize = set.size() - start;
        List<T> segment = new ArrayList<T>(segmentSize);
        for (int k = 0; k < segmentSize; k++) {
            segment.add(it.next());
        }
        arrays[n - 1] = segment;

        return arrays;
    } else {
        throw new IllegalArgumentException("n must not be smaller set size!");
    }
}

From source file:Main.java

/**
 * Answers true if a predicate is true for at least one element of a
 * collection.//from  w w  w  .j  a v a 2 s . co  m
 * 
 * @param <T>
 * @param collection
 *            - the collection to get the input from, may be null
 * @param value
 *            - value to check
 * @return true if a collection contains specified value.
 */
public static <T> boolean contains(Collection<T> collection, T value) {
    return collection != null && collection.size() > 0 ? collection.contains(value) : false;
}

From source file:Main.java

public static String getShorty(Collection<? extends CharSequence> params, String returnType) {
    StringBuilder sb = new StringBuilder(params.size() + 1);
    sb.append(getShortyType(returnType));
    for (CharSequence typeRef : params) {
        sb.append(getShortyType(typeRef));
    }/*w w  w . j  a v  a2 s  .  c o  m*/
    return sb.toString();
}