source_file.java:3: error: class, interface, or enum expected
   public static void main(String[] args) {
                 ^
source_file.java:5: error: class, interface, or enum expected
      HashMap<Integer,String> produtos = new HashMap<>();
      ^
source_file.java:6: error: class, interface, or enum expected
      int opcao;
      ^
source_file.java:7: error: class, interface, or enum expected
      do{
      ^
source_file.java:10: error: class, interface, or enum expected
         opcao = teclado.nextInt();
         ^
source_file.java:11: error: class, interface, or enum expected
         switch(opcao){
         ^
source_file.java:14: error: class, interface, or enum expected
               int codigoN = teclado.nextInt();
               ^
source_file.java:15: error: class, interface, or enum expected
               System.out.println("Nome do novo produto:");
               ^
source_file.java:16: error: class, interface, or enum expected
               String nomeN = teclado.next();
               ^
source_file.java:17: error: class, interface, or enum expected
               produtos.put(codigoN, nomeN);
               ^
source_file.java:18: error: class, interface, or enum expected
               break;
               ^
source_file.java:19: error: class, interface, or enum expected
            case 2:
            ^
source_file.java:21: error: class, interface, or enum expected
               int codigo = teclado.nextInt();
               ^
source_file.java:22: error: class, interface, or enum expected
               String nome = produtos.get(codigo);
               ^
source_file.java:23: error: class, interface, or enum expected
               if(nome!=null)
               ^
source_file.java:25: error: class, interface, or enum expected
               break;
               ^
source_file.java:26: error: class, interface, or enum expected
         }
         ^
source_file.java:28: error: class, interface, or enum expected
   }
   ^
18 errors