老师，我的统计职员方法实在不会写，是不是我其他方法存在缺陷，代码如下..

package com.my.staff;

import com.my.administration.Administration;
import com.my.position.Job;

/**
 * 员工类
 * @author Administrator
 *
 */
public class Staff {
	private String staffName;//员工姓名
	private String staffNo;//工号
	private String staffSex;//性别
	private int staffAge;//年龄
	private Administration admin;
	/**
	 * 无参构造方法
	 */
	public Staff() {
		
	}
	
	

	public Staff(String staffName, String staffNo, String staffSex, int staffAge,Administration admin) {
		super();
		this.setStaffName(staffName);
		this.setStaffNo(staffNo);
		this.setStaffAge(staffAge);
		this.setStaffSex(staffSex);
		this.setAdmin(admin);
	}



	public String getStaffName() {
		return staffName;
	}

	public void setStaffName(String staffName) {
		this.staffName = staffName;
	}

	public String getStaffNo() {
		return staffNo;
	}

	public void setStaffNo(String staffNo) {
		this.staffNo = staffNo;
	}

	public String getStaffSex() {
		return staffSex;
	}

	public void setStaffSex(String staffSex) {
		this.staffSex = staffSex;
	}

	public int getStaffAge() {
		if(this.staffAge<18)
			staffAge=18;
		return staffAge;
	}

	public void setStaffAge(int staffAge) {
		this.staffAge = staffAge;
	}
	
	



	public Administration getAdmin() {
		return admin;
	}



	public void setAdmin(Administration admin) {
		this.admin = admin;
	}



	/**
	 * 
	 * @return 员工的基本信息
	 */
	public String showStaff() {
		String str="姓名:"+this.getStaffName()+"\n工号:"+this.getStaffNo()
		+"\n性别:"+this.getStaffSex()+"\n年龄:"+this.getStaffAge()
		+"\n职务:"+this.getAdmin().getAdminName()+this.getAdmin().getJob().getJobName();
		return str;
	}
}

package com.my.administration;

import com.my.position.Job;

import com.my.staff.Staff;

//部门类

public class Administration {

private String adminName;

private Job job;

private Staff[] staff;

private int staffNo;

/**

* 无参构造方法

*/

public Administration() {

}

public Administration(String adminName,Job job) {

super();

this.setAdminName(adminName);

this.setJob(job);

}

public String getAdminName() {

return adminName;

}

public void setAdminName(String adminName) {

this.adminName = adminName;

}

public Job getJob() {

if(this.job==null)

job=new Job();

return job;

}

public void setJob(Job job) {

this.job = job;

}

public Staff[] getStaff() {

if(staff==null)

staff=new Staff[10];

return staff;

}

public void setStaff(Staff[] staff) {

this.staff = staff;

}

public int getStaffNo() {

return staffNo;

}

public void setStaffNo(int staffNo) {

this.staffNo = staffNo;

}

public void addStaff(Staff staff) {

}

}

package com.my.position;

//职员类

public class Job {

private String jobName;

public Job() {

super();

}

public Job(String jobName) {

super();

this.setJobName(jobName);

}

public String getJobName() {

return jobName;

}

public void setJobName(String jobName) {

this.jobName = jobName;

}

}

package com.my.test;

import com.my.administration.Administration;

//测试类

import com.my.position.Job;

import com.my.staff.*;

public class Test {

public static void main(String[] args) {

// TODO Auto-generated method stub

Job job=new Job("职员");

Job job1=new Job("助理");

Job job2=new Job("经理");

Administration admin=new Administration("市场部",job);

Administration admin1=new Administration("市场部",job1);

Administration admin2=new Administration("市场部",job2);

Administration admin3=new Administration("人事部",job);

Administration admin4=new Administration("人事部",job1);

Administration admin5=new Administration("人事部",job2);

Staff staff=new Staff("摩根弗里曼", "S001", "男", 17,admin);

Staff staff1=new Staff("金凯瑞", "S002", "男", 19,admin1);

Staff staff2=new Staff("汤姆克鲁斯", "S003", "男", 19,admin2);

Staff staff3=new Staff("摩根弗里曼", "S001", "男", 17,admin3);

Staff staff4=new Staff("金凯瑞", "S002", "男", 19,admin4);

Staff staff5=new Staff("汤姆克鲁斯", "S003", "男", 19,admin5);

String str=staff.showStaff();

System.out.println(staff.showStaff());

System.out.println("========================================================");

System.out.println(staff1.showStaff());

System.out.println("========================================================");

System.out.println(staff2.showStaff());

System.out.println("========================================================");

System.out.println(staff3.showStaff());

System.out.println("========================================================");

System.out.println(staff4.showStaff());

System.out.println("========================================================");

System.out.println(staff5.showStaff());

}

}