Java Array Concatenate concatenate(int[]... arrays)

Description

Concatenates a series of arrays.

License

Open Source License

Parameter

Parameter	Description
arrays	List of arrays

Return

Concatenated array

Declaration

public static int[] concatenate(int[]... arrays) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2016 Pablo Pavon-Marino.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Lesser Public License v2.1
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/lgpl.html
 *
 * Contributors:/*  w  w  w .j a  v a2  s . c o m*/
 *     Pablo Pavon-Marino - Jose-Luis Izquierdo-Zaragoza, up to version 0.3.1
 *     Pablo Pavon-Marino - from version 0.4.0 onwards
 ******************************************************************************/

import java.util.*;

public class Main {
    /**
     * Concatenates a series of arrays.
     *
     * @param arrays List of arrays
     * @return Concatenated array
     */
    public static int[] concatenate(int[]... arrays) {
        List<Integer> list = new LinkedList<Integer>();

        for (int[] array : arrays)
            list.addAll(toList(array));

        return toArray(list);
    }

    /**
     * Converts from a {@code int} array to a list.
     *
     * @param array Input array
     * @return A list of {@code Integer} objects
     *  
     */
    public static List<Integer> toList(int[] array) {
        List<Integer> list = new ArrayList<Integer>();
        for (int i = 0; i < array.length; i++)
            list.add(array[i]);

        return list;
    }

    /**
     * Converts an array of {@code String} with the values, into a {@code int} array. Uses {@code Integer.parseInt} to parse the number, an can raise the exceptions 
     * that this method raises
     *
     * @param list Input list
     * @return output array
     */
    public static int[] toArray(String[] list) {
        int[] res = new int[list.length];
        int counter = 0;
        for (String s : list)
            res[counter++] = Integer.parseInt(s);
        return res;
    }

    /**
     * Converts a collection ({@code List}, {@code Set}...) of {@code Integer} objects to an {@code int} array.
     *
     * @param list Input list
     * @return {@code int} array
     *  
     */
    public static int[] toArray(Collection<Integer> list) {
        return asPrimitiveArray(list.toArray(new Integer[list.size()]));
    }

    /**
     * Converts from an {@code Integer} array to an {@code int} array.
     *
     * @param array {@code Integer} array
     * @return Equivalent {@code int} array
     */
    public static int[] asPrimitiveArray(Integer[] array) {
        int[] primitiveArray = new int[array.length];

        for (int i = 0; i < array.length; i++)
            primitiveArray[i] = array[i];

        return primitiveArray;
    }
}

Related

1. concatByteArrays(final byte[] array1, final byte[] array2)
2. concatenate(@SuppressWarnings("unchecked") T[]... arrays)
3. concatenate(byte[] a, byte[] b)
4. concatenate(double[] p1, double[] p2)
5. concatenate(float[][] a, float[][] b, int dim)
6. concatenate(Object[] array)
7. concatenate(Object[] array)
8. concatenate(Object[] array)
9. concatenate(Object[] array)