将元素添加到线程的向量并打印它们 - Java

My goal is to start three unsynchronized threads and have them add a thousand elements each. These elements need to be stored in a set (I chose Vector) and then printed. For some reason I am not getting the elements to print. I've tried trouble shooting the print method and the method that creates the elements. Any help is appreciated. My goal is to start three unsynchronized thread