如何使用反射调用Java中的方法？

Question

I have a scenario where I instantiate a class and call a method like the one given below using java reflection mechanism.

    WorkerObjectType workerObjectType = new WorkerObjectType();
    WorkerObjectIDType workerObjectIdType = new WorkerObjectIDType();
    workerObjectIdType.setType("Employee_ID");
    workerObjectIdType.setValue("102");
    workerObjectType.getID().add(workerObjectIdType);
    workerReqReferenceType.getWorkerReference().add(workerObjectType);

For above case I tried using java reflection as below:

Class<?> workerObjectTypeRef = Class.forName("platinum.humanresource.WorkerObjectType");
Object workerObjectType = workerObjectTypeRef.newInstance();
Class<?> workerObjectIDTypeRef = Class.forName("platinum.humanresource.WorkerObjectIDType");
Object workerObjectIdType = workerObjectIDTypeRef.newInstance();
Method setType = workerObjectIDTypeRef.getDeclaredMethod("setType", String.class);
setType.invoke(workerObjectIdType, "Employee_ID");
Method setValue = workerObjectIDTypeRef.getDeclaredMethod("setValue", String.class);
setValue.invoke(workerObjectIdType, "102");

I am unable to do it particularly in the following scenario:

workerObjectType.getID().add(workerObjectIdType);
workerReqReferenceType.getWorkerReference().add(workerObjectType);

Answer 1

You'll need to call the getters for the instances, and then invoke methods on the returned instances using reflection as well. Here's an example for workerObjectType.getID().add(workerObjectIdType)

Method getID = workerObjectTypeRef.getDeclaredMethod("getID");
Object id = getID.invoke(workerObjectType);
Class idRef = id.getClass();
Method add = idRef.getDeclaredMethod("add", workerObjectIDTypeRef);
add.invoke(id, workerObjectIDType);