please correct this program

import java.util.*; 

public class Nam{

    public static void main (String arg[]){
        String[] name={"Aki","Karthi","Tk","Suba","Malu","Buvi","Janu","Sara","Sandy","Abi","Ani","Amu","Banu"};
        System.out.println("Enter any character");
        Scanner scanobj=new Scanner(System.in);
        ArrayList list=new ArrayList();
        for(int i=0;i<name.length;i++){
            list.add(name[i].substring(0,1));
        }
        String st=scanobj.next();
        String sub=st.substring(0,1);
           if(list.contains(sub)){
               for(int i=0;i<name.length;i++){
                   if(list.get(i).toString().equals(sub)){
                     System.out.println(name[i]);
                   }
               }
           }
           else{ 
            System.out.println("Invalid");
           }
    }
}