Reverses the contents of the array.

      

/*
 * Copyright WizTools.org
 * Licensed under the Apache License, Version 2.0:
 * http://www.apache.org/licenses/LICENSE-2.0
 */
//package org.wiztools.commons;

import java.util.ArrayList;
import java.util.List;

/**
 *
 * @author subwiz
 */
public final class ArrayUtil {

    /**
     * Reverses the contents of the array.
     * @param <T>
     * @param arr The input array of objects.
     */
    public static <T> void reverse(T[] arr) {
        for(int left=0, right=arr.length-1; left < right; left++, right--) {
            final T tmp = arr[left];
            arr[left] = arr[right];
            arr[right] = tmp;
        }
    }

    public static void reverse(boolean[] arr) {
        for(int left=0, right=arr.length-1; left < right; left++, right--) {
            final boolean tmp = arr[left];
            arr[left] = arr[right];
            arr[right] = tmp;
        }
    }
    
    public static void reverse(byte[] arr) {
        for(int left=0, right=arr.length-1; left < right; left++, right--) {
            final byte tmp = arr[left];
            arr[left] = arr[right];
            arr[right] = tmp;
        }
    }

    public static void reverse(char[] arr) {
        for(int left=0, right=arr.length-1; left < right; left++, right--) {
            final char tmp = arr[left];
            arr[left] = arr[right];
            arr[right] = tmp;
        }
    }

    public static void reverse(short[] arr) {
        for(int left=0, right=arr.length-1; left < right; left++, right--) {
            final short tmp = arr[left];
            arr[left] = arr[right];
            arr[right] = tmp;
        }
    }

    public static void reverse(int[] arr) {
        for(int left=0, right=arr.length-1; left < right; left++, right--) {
            final int tmp = arr[left];
            arr[left] = arr[right];
            arr[right] = tmp;
        }
    }

    public static void reverse(long[] arr) {
        for(int left=0, right=arr.length-1; left < right; left++, right--) {
            final long tmp = arr[left];
            arr[left] = arr[right];
            arr[right] = tmp;
        }
    }

    public static void reverse(float[] arr) {
        for(int left=0, right=arr.length-1; left < right; left++, right--) {
            final float tmp = arr[left];
            arr[left] = arr[right];
            arr[right] = tmp;
        }
    }

    public static void reverse(double[] arr) {
        for(int left=0, right=arr.length-1; left < right; left++, right--) {
            final double tmp = arr[left];
            arr[left] = arr[right];
            arr[right] = tmp;
        }
    }
}

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Reverses the contents of the array. : Array Compare « Collections Data Structure « Java

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