how to display the information inside an object

we are assigned to implement the inside of a code block wherein it is associated with a given class (EmployeeProjectDetail) which is declared as a arraylist.

my code follows below.

public List<EmployeeProjectDetail> getEmployeeProjectHistory(long employeeID, long projectID) {

List<EmployeeProjectDetail> detailList = new ArrayList<EmployeeProjectDetail>();
return detailList;
}

I tried inputting the statements.

detailList.contains(projectDAO.getEmployeeProjects(employeeID));
detailList.contains(projectDAO.getEmployeeProjectRoles(employeeID, projectID)); 

the code then doesn't return any value but the invovled sql quer开发者_如何学编程ies in projectDAO class are thoroughly handled. any help will be appreciated.

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contains checks whether an item is in a list what your are looking for is add.

You should add the line

detailList.add(projectDAO.getEmployeeProjects(employeeID));

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Update (I'm guessing on the method and class names)

Based on the ClassCastException it appears that getEmployeeProjects(employeeID) returns an ArrayList. If the objects in this ArrayList are EmployeeProjectDetail's you can just replace the method body with return projectDAO.getEmployeeProjects(employeeID);. If they are a different object representing a project, say EmployeeProject, you would need to replace the method body with the following code:

List<Project> projects = projectDAO.getEmployeeProjects(employeeID);
ArrayList<EmployeeProjectDetail> projectDetails = new ArrayList<EmployeeProjectDetail>();
for (Project project : projects) {
    if(project.getProjectID == projectID){
        projectDetails.add(project.getProjectDetail());
    }
}