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A lightweight alternative to Java 8 sequential Stream
There is a newer version: 2.3.0
/*
 * Copyright 2016 Daniel Skogquist Åborg
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.d2ab.util;

import java.util.Arrays;
import java.util.function.Consumer;

/**
 * Utilities for arrays, similar to {@link Arrays} with a few extras like iterators and {@link #forEach}.
 */
public class Arrayz {
	private Arrayz() {
	}

	/**
	 * Perform the given action once for each item in the given array.
	 */
	public static  void forEach(T[] array, Consumer action) {
		for (T item : array)
			action.accept(item);
	}

	/**
	 * Swap the given items in the given array.
	 */
	public static void swap(long[] array, int i, int j) {
		long temp = array[i];
		array[i] = array[j];
		array[j] = temp;
	}

	/**
	 * Swap the given items in the given array.
	 */
	public static void swap(int[] array, int i, int j) {
		int temp = array[i];
		array[i] = array[j];
		array[j] = temp;
	}

	/**
	 * Swap the given items in the given array.
	 */
	public static void swap(char[] array, int i, int j) {
		char temp = array[i];
		array[i] = array[j];
		array[j] = temp;
	}

	/**
	 * Swap the given items in the given array.
	 */
	public static void swap(double[] array, int i, int j) {
		double temp = array[i];
		array[i] = array[j];
		array[j] = temp;
	}

	/**
	 * Swap the given items in the given array.
	 */
	public static void swap(Object[] array, int i, int j) {
		Object temp = array[i];
		array[i] = array[j];
		array[j] = temp;
	}

	/**
	 * Reverse the given array in place.
	 *
	 * @return the given array.
	 */
	public static Object[] reverse(Object... array) {
		for (int i = 0; i < array.length / 2; i++)
			swap(array, i, array.length - i - 1);
		return array;
	}

	/**
	 * Reverse the given array in place.
	 *
	 * @return the given array.
	 */
	public static double[] reverse(double... array) {
		for (int i = 0; i < array.length / 2; i++)
			swap(array, i, array.length - 1 - i);
		return array;
	}

	/**
	 * Reverse the given array in place.
	 *
	 * @return the given array.
	 */
	public static int[] reverse(int... array) {
		for (int i = 0; i < array.length / 2; i++)
			swap(array, i, array.length - 1 - i);
		return array;
	}

	/**
	 * Reverse the given array in place.
	 *
	 * @return the given array.
	 */
	public static long[] reverse(long... array) {
		for (int i = 0; i < array.length / 2; i++)
			swap(array, i, array.length - 1 - i);
		return array;
	}

	/**
	 * Reverse the given array in place.
	 *
	 * @return the given array.
	 */
	public static char[] reverse(char... array) {
		for (int i = 0; i < array.length / 2; i++)
			swap(array, i, array.length - 1 - i);
		return array;
	}
}