hi,

 

i have two arrayLists and i want to check if they contain the same values, to check if a condition is met.

 

arrayList1 (1, 2 ,3)

arrayList2 (1,1,1,1,1, 2, 2, 2, 3, 3, 3 )

 

the condition is that arrayList2 has the same elements as arrayList1.

 

i thought this could be done in either of two ways;

1) remove duplicate elements of arrayList2, retaining the first instance: arrayList2 then becomes (1, 2, 3);

then condition can be checked either arrayList1 == arralyList2 , or arrayList1.size() == arrayList2.size();

2) count if the same element occurs, to get an int value;

then condition can be checked if int == arrayList1.size();

 

Happy to do either way but i tried to code the 2nd, but i am counting the number of times an element of arrayList 1 occurs in arrayList 2, not if it occurs - to do this would need move to next element in first array once found and continue checking, but don't know how to do that.

 

    int count = 0;
    for(int i=0; i<arrayList1.size(); i++) {
      int val = (Integer) arrayList1.get(i);
      for(int j=0; j<arrayList2.size(); j++) {
        if (arrayList2.contains(val)) {
          count++;
        }
      }      
    }

 

i am sure this has been discussed before but have not been able to find the answer yet on this or the old forum.

 

thanks for any help.