Comparing two fixed list

[bostero]

I have 2 fixed list and I need to compare if an element on list one it is also contained on list two. Do I have to use compareList? or equals()?

this is what I have in mind
if(list1==list2)
return true;
else
return false;

 

[obadare]

this falls within realm of sets:
you need to find the intersection between 2 lists,
have a look at this link:

http://www.lupinho.de/gishur/gishur.doc/gishur/x2/core/Intersection.html

 

[prosper]

import java.util.ArrayList;
public class ColTest{
public static void main(String args[]){
              String one = new String("1");
              String two = new String("2");
              ArrayList ar1 = new ArrayList();
              ar1.add(one);
              ar1.add(two);
              ArrayList ar2 = new ArrayList();
              ar2.add(two);
              ar2.add(one);

              int matchCount = 0;
              for (int i=0; i<ar1.size(); i++){
                  if ( ar2.contains(ar1.get(i)) ){
                     matchCount++;
                  }
              }
              System.out.println("matchCount"+matchCount);
              if (matchCount==ar1.size()){
                 System.out.println("All elements are found in Arraylist 2");
              }
       }     
       
}

 

[stefanwagner]

if(list1==list2)

will only return true, if both references refer to the same object.

The prosper-approach does rely on the objects in the list being in the same order.



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[Diancecht]

I'd use the java.util.Arrays class: just sort and compare.

Cheers,
Dian