可否问下各位教师，关于人数统计的问题

public void addWorker(Worker wo) {
		for(int i=0;i<this.getMyWorkers().length;i++)
			if(this.getMyWorkers()[i]==null) {
				this.getMyWorkers()[i]=wo;
				if(wo.getWorkerApartment().apartmentNum==this.apartmentNum)
					workerNum++;return;
			}
	}

public class Test {

	public static void main(String[] args) {
		Apartment ap1 = new Apartment("人事部",1);
		Apartment ap2 = new Apartment("市场部",2);
		
		Position po1 = new Position("经理");
		Position po2 = new Position("助理");
		Position po3 = new Position("职员");
		
		Worker wo1 = new Worker("张铭","S001","男",29,ap1,po1);
		Worker wo2 = new Worker("李艾爱","S002","女",21,ap1,po2);
		Worker wo3 = new Worker("孙超","S004","男",29,ap1,po3);
		Worker wo4 = new Worker("张美美","S005","女",26,ap2,po3);
		Worker wo5 = new Worker("蓝迪","S006","男",37,ap2,po1);
		Worker wo6 = new Worker("米莉","S007","女",24,ap2,po3);
		
		System.out.println(wo1.introduction());
		System.out.println("==================");
		System.out.println(wo2.introduction());
		System.out.println("==================");
		System.out.println(wo3.introduction());
		System.out.println("==================");
		System.out.println(wo4.introduction());
		System.out.println("==================");
		System.out.println(wo5.introduction());
		System.out.println("==================");
		System.out.println(wo6.introduction());
		System.out.println("==================");
		
		ap1.addWorker(wo1);
		ap1.addWorker(wo2);
		ap1.addWorker(wo3);
		ap1.addWorker(wo4);
		ap1.addWorker(wo5);
		ap1.addWorker(wo6);
		System.out.println(ap1.getApartmentName()+"共有"+ap1.getWorkerNum()+"名员工");
		
		ap2.addWorker(wo1);
		ap2.addWorker(wo2);
		ap2.addWorker(wo3);
		ap2.addWorker(wo4);
		ap2.addWorker(wo5);
		ap2.addWorker(wo6);
		System.out.println(ap2.getApartmentName()+"共有"+ap2.getWorkerNum()+"名员工");
	}
}

2）部门类的统计该部门员工个数的方法实现功能不完整，统计该部门员工个数的方法，即添加员工的方法，参数类型为员工类型，循环遍历员工数组，如果数组元素为null，将传进来的参数赋值给当次循环的数组元素，并设置其所属部门，统计员工个数的变量+1；退出循环

一开始不是设置好员工的属性（包括所属部门）了吗，有点无法理解