Reverses the contents of the given array. - Java Collection Framework

Java examples for Collection Framework:Array Reverse

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Description

Reverses the contents of the given array.

Demo Code


//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        int[] arr = new int[] { 34, 35, 36, 37, 37, 37, 67, 68, 69 };
        reverse(arr);/*from  w  w  w .j a  v  a2  s . c  o  m*/
    }

    /**
     * Reverses the contents of the given array.
     * @param arr
     */
    public static void reverse(int[] arr) {
        // exchange arr[0] with arr[length - 1], arr[1] 
        // with arr[length - 2], and so on, until we get
        // to the middle of the array
        int front = 0;
        int rear = arr.length - 1;
        while (front < rear) {
            // exchange arr[front] with arr[rear] using a temporary variable
            int temp = arr[front];
            arr[front] = arr[rear];
            arr[rear] = temp;

            // move indices towards the center
            front += 1;
            rear -= 1;
        }
    }
}

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