I'd like a "goto" like in my method

Question

here's my code:
     bl = true;
          do {
               // apresentar o problema
               try {
                    System.out.println(p1 + escolhido.getOperacao() + p2 + " ?");
               catch (NullPointerException npe) {
                    System.out.println("Escolha uma operacao valida!");
               try {
                    // ler a resposta
                    String input = ac.getResposta();//tem de estar aqui
                    // converter em valor num?rico
                    double valor = Double.parseDouble(input.trim());
                    double solucao = escolhido.getResultado(p1, p2);
                    double solucaoMesmo = solucao;
                    // responder
                    if (solucaoMesmo == valor) {
                         System.out.println("certo!");
                         bl = false;
                    else {
                         System.out.println("Tenta outra vez");
                         bl = true;
            catch (NumberFormatException badInput) {
                System.out.println ("Introduza um numero!");
          while (bl);if i dont use the 1rst try/catch a get a NPException, but the code, when the exception is catched, doesnt flow like it flows with the 2nd try/catch.
Beeing more concrete, if users inputs a '+' or '-', the app goes on asking for a numeric answer.
If user inputs something diferent than a number, the 2nd catch works and gives user the (terrestrial :)) oportunity to go on and have another chance.
This is the behaviour i'd like to my first try/catch (give user the oportunity to restart and input a '+' or '-'), but i just cant.
Can someone pls help me on this?

Answer 1

How about this:
bl = true;
          do {
               try {
                                System.out.println(p1 + escolhido.getOperacao() + p2 + " ?");
                    // ler a resposta
                    String input = ac.getResposta();//tem de estar aqui
                    // converter em valor num?rico
                    double valor = Double.parseDouble(input.trim());
                    double solucao = escolhido.getResultado(p1, p2);
                    double solucaoMesmo = solucao;
                    // responder
                    if (solucaoMesmo == valor) {
                         System.out.println("certo!");
                         bl = false;
                    else {
                         System.out.println("Tenta outra vez");
                         bl = true;
               } catch (NumberFormatException badInput) {
                           System.out.println ("Introduza um numero!");
                       }  catch (NullPointerException npe) {
                    System.out.println("Escolha uma operacao valida!");
          while (bl);