Solved

Copying arrays

Posted on 2004-04-14
4
236 Views
Last Modified: 2010-03-31
i need a little bit of help here - i'll try to explain it as best as i can.

I'm creating a program that will time the length of time taken to execute various sorting algorithms.  I'm using the System.currentTimeMillis() before and after tha algorithm to time it.  However, since most of the algorithms run really fast, i have to execute the loop many times getting the time at the start and at the end and then getting the average.  However, I need to reset the values of the array back to the unsorted values each time.  When i use something like newArray = oldArray, the values in oldArray automatically get replaced with the sorted values and i end up sorting the already sorted values.  Is there any way i can copy the values of the array without it changing the values of the original.  I cant use a for loop and do the values one at a time because this would then affect the running time of the algorithm that i am trying to time.

any help would be much appreciated.
0
Comment
Question by:Paul_Murphy
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
4 Comments
 
LVL 13

Accepted Solution

by:
Webstorm earned 500 total points
ID: 10825066
Hi Paul_Murphy,

   int[] newArray = (int[]) oldArray.clone();
0
 
LVL 13

Expert Comment

by:Webstorm
ID: 10825116
You can also replace int[] by another array type.


If you need (for your problem, i don't think you need) also to duplicate array values (array elements type which are not primitive type (short, char, int, boolean, long) like objects and array, you can duplicate each element :

Cloneable[] newArray = (Cloneable[]) oldArray.clone();
for (int i=0;i<newArray.length;i++)
    newArray[i] = (Cloneable)newArray[i].clone();

0
 

Author Comment

by:Paul_Murphy
ID: 10825130
thanks a million
0
 
LVL 13

Expert Comment

by:Webstorm
ID: 10825186
:-)
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Tomcat: Unable to run tomcat service. 2 29
Android development question 2 76
Selenium docs api java index 3 64
Html split(text) 2 27
For beginner Java programmers or at least those new to the Eclipse IDE, the following tutorial will show some (four) ways in which you can import your Java projects to your Eclipse workbench. Introduction While learning Java can be done with…
By the end of 1980s, object oriented programming using languages like C++, Simula69 and ObjectPascal gained momentum. It looked like programmers finally found the perfect language. C++ successfully combined the object oriented principles of Simula w…
Viewers will learn about the regular for loop in Java and how to use it. Definition: Break the for loop down into 3 parts: Syntax when using for loops: Example using a for loop:
This tutorial explains how to use the VisualVM tool for the Java platform application. This video goes into detail on the Threads, Sampler, and Profiler tabs.

756 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question