Example usage for java.util Collection toArray

Introduction

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

Prototype

default <T> T[] toArray(IntFunction<T[]> generator)

Source Link

Document

Returns an array containing all of the elements in this collection, using the provided generator function to allocate the returned array.

Usage

From source file:Main.java

@SuppressWarnings("unchecked")
public static <E> E[] asArray(final Collection<? extends E> collection) {
    return collection.toArray((E[]) new Object[collection.size()]);
}

From source file:Main.java

public static int[] toIntArray(Collection<Integer> list) {
    return toPrimitive(list.toArray(new Integer[0]));
}

From source file:Main.java

/** USE NATIVE c.toArray(a) */
@Deprecated//from   ww  w  .  j  av a 2  s  . c  o  m
public static <T> T[] toArray(Collection<T> c, T[] a) {
    return c.toArray(a);
}

From source file:Main.java

public static <T> T[] convertArrayToList(Collection<T> list) {
    return (T[]) (list.size() > 0
            ? list.toArray((Object[]) Array.newInstance(list.iterator().next().getClass(), list.size()))
            : null);//from   w w  w. ja  va2  s  .  co  m
}

From source file:Main.java

/**
 * Calls the {@link Collection#toArray(Object[])} method constructing array based on the given argument type.
 *
 * @param <E>//from   w w  w.ja v a2s  .  c o  m
 *            the element type
 * @param collection
 *            the collection
 * @param type
 *            the type
 * @return the e[]
 */
@SuppressWarnings("unchecked")
public static <E> E[] toArray(Collection<? extends E> collection, Class<E> type) {
    return collection.toArray((E[]) Array.newInstance(type, collection.size()));
}

From source file:Main.java

public static String[] listToArrays(Collection<String> values) {
    String[] ret = new String[values.size()];
    values.toArray(ret);
    return ret;//from w ww  . j  av a 2s  . c o  m
}

From source file:Main.java

public static String split(Collection<?> collections, String separator) {

    Object[] array = collections.toArray(new Object[0]);
    int length = array.length;
    StringBuilder stringBuilder = new StringBuilder();
    for (int i = 0; i < length; i++) {
        stringBuilder.append(array[i]);// w w w.  ja  v a 2  s . com
        if (i != length - 1) {
            stringBuilder.append(separator);
        }
    }
    return stringBuilder.toString();
}

From source file:Main.java

public static Map<String, Object> toMap(Collection<String> names, Object[] parameters) {
    return toMap(names.toArray(new String[0]), parameters);
}

From source file:Main.java

/**
 * Converts the given Collection into an array of the given type.
 *
 * @param collection The collection to convert
 * @param arrayType  The type of array to return
 * @return The new array//w  w  w. j av  a 2  s . c  o m
 */
@SuppressWarnings({ "unchecked" })
public static <E> E[] toArray(Collection<E> collection, Class<? extends E> arrayType) {
    return collection.toArray((E[]) Array.newInstance(arrayType, collection.size()));
}

From source file:Main.java

/**
 * To Array/*from  w  w  w  . j a  va 2  s . c  om*/
 * 
 * @param c
 *            Collection
 * @return T[]
 */
@SuppressWarnings("unchecked")
public static <T> T[] toArray(Collection<T> c) {
    if (c == null) {
        return null;
    }
    return (T[]) c.toArray(new Object[c.size()]);
}