Question

ArrayList <String> fil = new ArrayList<String>(); 
ArrayList <String> lif = new ArrayList<String>();

int x=0;
long tim = System.currentTimeMillis(); 
Random random = new Random(tim); 
for(int i=0;i<fil.size();i++)
{
 x =random.nextInt(fil.size());
         for(int y=0;y<lif.size();y++)
         {
             if(fil.get(x).equals(lif.get(y)))
             {
                 i--;
                 continue;
             }
         }
         System.out.println("Set the value of x"+x);
          lif.add(i, fil.get(x));//array index out of bound exception


     }

I’m trying to copy the contents of ArrayList fil to lif in a different order, but I get an ArrayIndexOutOfBoundException in the commented line. I’m using a nested for-loop to check if the elements of new ArrayList are unique.

Answer 1

Why don’t you try Collections.copy and Collections.shuffle methods.