How can I cast from object to the bean

Question

I have a Created three class and want to cast from object to the userPerformanceDetail bean.

I am getting class cast exception.

First class that i have created is

    class UserDetail{
       int a;
       getter;
       setter;
    }

Second class is

    class UserPerformance{
      int b;
      getter;
      setter;
    }

and third class that uses above two classes and have getter and setter

    class UserPerformanceDetail{
      UserDetail userDetail;
      UserPerformance userPerformance;

      getter;
      setter;
    }

and in other class i have created method that returns List

So how can I get UserPerformanceDetail from List

can I do

    for(Object obj: list){

     UserPerformanceDetail  userPerformanceDetail  = (UserPerformanceDetail)obj

    }

above is giving class cast exception

I am getting class cast exception.

Answer 1

one possibility to avoid ClassCastException is to use instanceof :

if (obj instanceof UserPerformanceDetail){
  UserPerformanceDetail  userPerformanceDetail  = (UserPerformanceDetail)obj;
}

Answer 2

for(Object obj: list){
    if(obj instanceof UserPerformanceDetail) {
        UserPerformanceDetail  userPerformanceDetail  = (UserPerformanceDetail)obj
    }
}

The above code should do it. but it will only get you objects that are UserPerformanceDetail

Answer 3

I got the solution of above problem. I checked my code and got that I have duplicate object "UserPerformanceDetail" when I deleted one and rerun the application I got the correct results