Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import java.nio.ByteBuffer;

public class Main {
    public static long bytesToLong(byte[] bytes) {
        ByteBuffer buffer = ByteBuffer.allocate(8);
        reverseArray(bytes);
        buffer.put(bytes, 0, bytes.length);
        buffer.flip();// need flip
        return buffer.getLong();
    }

    private static void reverseArray(byte[] a) {
        int i = 0, n = a.length - 1;
        while (n > 2 * i) {
            byte x = a[i];
            a[i] = a[n - i];
            a[n - i] = x;
            i++;
        }

    }
}