Well i just ran test i not sure how to compile out differently but it
seems like for each loop is slow.
--------- For Each Loop -------
Start: 1260903435636
End: 1260903435648
ForEach - Elapsed time in milliseconds: 12
-------END-------
--------- Iterator Loop -------
Start: 1260903435648
End: 1260903435656
Iterator - Elapsed time in milliseconds: 8
-------END-------
--------- For Loop --------
Start: 1260903435656
End: 1260903435662
For - Elapsed time in milliseconds: 6
-------END-------
--------- While Loop -------
Start: 1260903435662
End: 1260903435668
While - Elapsed time in milliseconds: 6
-------END-------
Using the code
[code]
package com.ottocap.NewWorkFlow.client.Widget;
import java.util.Arrays;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
public class ArrayToList {
public ArrayToList() {
String sArray[] = createArray();
//convert array to list
List lList = Arrays.asList(sArray);
System.out.println("\n--------- For Each Loop -------\n");
long lForEachStartTime = new Date().getTime();
System.out.println("Start: " + lForEachStartTime);
//for loop
for (Object thestring: lList){
String stemp = (String)thestring;
}
long lForEachEndTime = new Date().getTime();
System.out.println("End: " + lForEachEndTime);
long lForEachDifference = lForEachEndTime - lForEachStartTime;
System.out.println("ForEach - Elapsed time in milliseconds: " +
lForEachDifference);
System.out.println("\n-------END-------");
System.out.println("\n--------- Iterator Loop -------\n");
long lIteratorStartTime = new Date().getTime();
System.out.println("Start: " + lIteratorStartTime);
//iterator loop
Iterator<String> iterator = lList.iterator();
while ( iterator.hasNext() ){
String stemp = iterator.next();
}
long lIteratorEndTime = new Date().getTime();
System.out.println("End: " + lIteratorEndTime);
long lIteratorDifference = lIteratorEndTime - lIteratorStartTime;
System.out.println("Iterator - Elapsed time in milliseconds: " +
lIteratorDifference);
System.out.println("\n-------END-------");
System.out.println("\n--------- For Loop --------\n");
long lForStartTime = new Date().getTime();
System.out.println("Start: " + lForStartTime);
//for loop
for (int i=0; i< lList.size(); i++){
String stemp = (String)lList.get(i);
}
long lForEndTime = new Date().getTime();
System.out.println("End: " + lForEndTime);
long lForDifference = lForEndTime - lForStartTime;
System.out.println("For - Elapsed time in milliseconds: " +
lForDifference);
System.out.println("\n-------END-------");
System.out.println("\n--------- While Loop -------\n");
long lWhileStartTime = new Date().getTime();
System.out.println("Start: " + lWhileStartTime);
//while loop
int j=0;
while (j< lList.size())
{
String stemp = (String)lList.get(j);
j++;
}
long lWhileEndTime = new Date().getTime();
System.out.println("End: " + lWhileEndTime);
long lWhileDifference = lWhileEndTime - lWhileStartTime;
System.out.println("While - Elapsed time in milliseconds: " +
lWhileDifference);
System.out.println("\n-------END-------");
}
static String [] createArray(){
String sArray[] = new String [150000];
for(int i=0; i<150000; i++)
sArray[i] = "Array " + i;
return sArray;
}
}
[/code]
On Dec 15, 10:43 am, Chris Lowe <[email protected]> wrote:
> You could try compiling with the Pretty or Detailed options and
> examine the javascript?
>
> On Dec 15, 6:29 pm, "[email protected]" <[email protected]>
> wrote:
>
> > Just wondering what is a better way to code. Using for each loops or
> > for loops?
>
> > I am wondering will the resulting javascript be different.
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