类中的Java自定义异常处理

Question

我正在使用netbeans,我创建了这个异常类:

public class VehicleException extends Exception{
    private String matricula;
    private Calendar dataMatricula;
    private ModelVehicle model;

    private int causa;

        public VehicleException(int causa, Object valor) throws Exception {
        this.causa = causa;
        switch (causa) {
            case 1:
                dataMatricula = (Calendar) valor;
                break;
            case 2:
                matricula = (String) valor;
                break;
            case 3:
                model = (ModelVehicle) valor;
                break;

            default:
                throw new Exception("Utilització errònia en construir VehicleException. Causa: " + causa);
        }
    }

         @Override
    public String getMessage() {
        switch (causa) {
            case 1:
                return "dataMatricula erroni: " + dataMatricula + " Ha de contenir valor";
            case 2:
                return "matricula erroni: " + matricula + " Ha de contenir valor";
            case 3:
                return "Model erroni: " + model + " Ha de contenir valor";
            default:
                return "";
        }
    }

我正在我的班级"车辆"中处理这种异常:

public class Vehicle implements Comparable<Vehicle> {

    private String matricula;
    private ModelVehicle model;
    private Calendar dataMatricula;


     public Vehicle(String matricula, ModelVehicle model, Calendar dataMatricula) throws VehicleException {
        setMatricula(matricula);
        setDataMatricula(dataMatricula);
        setModelVehicle(model);


    }


     public String getMatricula(){
         return matricula;
     }

     public ModelVehicle getModelVehicle(){
         return model;
     }
     public Calendar getDataMatricula(){
         return dataMatricula;
     }


      public final void setMatricula(String matricula) throws VehicleException {
        if (matricula == null || matricula.compareTo("") == 0) {
            throw new VehicleException(2,matricula);
        }
        this.matricula = matricula;
    }

      public void setModelVehicle(ModelVehicle model) throws VehicleException{
          if(model == null){
             throw new VehicleException(3,model);
          }
          else {
              this.model = model;
          }
      }

      public void setDataMatricula(Calendar c) throws VehicleException{
          if(c == null){
             throw new VehicleException(1,c);
          }
          this.dataMatricula = c;
      }

当我尝试编译时问题锥,在setter方法中我收到此消息:

错误:未报告的异常异常; 必须被捕获或声明被抛出新的VehicleException(2,matricula); C:\ Users\Ivan\Desktop\Examen isidrer\M03-uf5\Exmaenm03uf5\src\info\infomila\Vehicle.java:55:error:undported exception Exception; 必须被捕获或声明抛出新的VehicleException(3,model); C:\ Users\Ivan\Desktop\Examen isidrer\M03-uf5\Exmaenm03uf5\src\info\infomila\Vehicle.java:64:error:undported exception Exception; 必须被捕获或声明被抛出新的VehicleException(1,c);

我不太清楚为什么会发生这种情况,因为setter方法有一个"抛出VehicleException".

Answer 1

构造函数VehicleException可以自己抛出异常:

public VehicleException(int causa, Object valor) throws Exception {
                                                 ^^^^^^^^^^^^^^^^

这意味着您的调用范围需要从构造函数处理/重新抛出该异常,或者您可以选择抑制异常而不是抛出异常.

default:
    super.addSuppressed(new Exception("Utilització errònia en construir VehicleException. Causa: " + causa));