///DecimalFormat df2 = new DecimalFormat(".##");
    Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/prasad","prasad","prasad");
    ResultSet rs=null;
    //String s=("select*from sbin;");
    Statement stmt=con.createStatement();
    //ResultSet rs=stmt.executeQuery(s);
    ArrayList<Float> grp=new ArrayList<Float>();
    //float[] grp=new grp[];
    Float one,two,three,four,five,six,seven;
    Float j;
    Float k;
    Float res,cal;
    String[] stock={"sbi","yesbank","concor","jublfood","kpit","wipro"};
    for(int i=0;i<stock.length;i++)
    {
        System.out.println("stock name"+ "  "+stock[i]);
    rs=stmt.executeQuery("select * from(select * from `"+stock[i]+"` order by date desc limit 7)sub order by date;");
    while(rs.next())
    //for(;rs.next();)
    {
        j=rs.getFloat(6);
        k=rs.getFloat(7);
        //cal=j-k;
        res=j-k;
       grp.add(res);
        System.out.println(res);
        System.out.println(rs.getString(1)+"  "+rs.getString(6)+" "+rs.getString(7));


    }
    System.out.println(grp);
    //for(i=0;i<=grp.size();i++)
        //{
     one=grp.get(i);
     two=grp.get(1);
     three=grp.get(2);
     four=grp.get(3);
     five=grp.get(4);
     six=grp.get(5);
     seven=grp.get(6);
     if(seven<=two && seven<=one && seven<=three && seven<=four && seven<=five && seven<=six)

         System.out.println("nr7");
         grp.clear();

Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 0, Size:
0
        at java.util.ArrayList.rangeCheck(Unknown Source)
        at java.util.ArrayList.get(Unknown Source)
        at misc1.main(misc1.java:45)