Comparing two arrays Comparing two sets

Set to array:
Long[] s=null;
for (CommodityType commodityType : commodityTypeList) {
     tt.add(commodityType.getSupplyType().getId());
    s=(Long[]) Array.newInstance(Long.class, att .size());
    for (int i = 0; i < s.length; i++) {                         
        s[i]=Long.parseLong(Long.toString(commodityType.getSupplyType().getId()));
break;
}
}
          if (Arrays.equals(s, supplyTypeIds)) { //Compare
               System.out.println("The elements in the two arrays have the same value"); 
              } else { 
               System.out.println("The elements in the two arrays The values ​​are not the same"); 
            } 



Compare the values ​​in the two lists for equality:
       Long[] supplyTypeIds={1,2,3,4,3,4};
List list = Arrays.asList(supplyTypeIds);//Array to set
for (int i = 0; i < att.size(); i++) {
if(!list.contains(att.get(i))){/ /comparison for equality
}
}