帮我看一下哪里错了，万分感谢

package com02;

import com01.com001;

import com03.com002;

import com04.com004;

public class com003 {

/**测试类

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

com001 x1= new com001("经理","bj001");

com001 x2= new com001("助理","bj002");

com001 x3= new com001("员工","bj003");

//************************************************;

com002 x4= new com002("人事部","rs001");

com002 x5= new com002("管理部","gl001");

com002 x6= new com002("经营部","jy001");

//************************************************;

com004 x7= new com004("张铭",15,"男",x1,x4);

System.out.println(x7.show());

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

com004 x8= new com004("西西",24,"女",x2,x5);

System.out.println(x8.show());

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

com004 x9= new com004("李泽",21,"男",x3,x6);

System.out.println(x9.show());

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

com004 x10= new com004("笔笔",19,"女",x3,x4);

System.out.println(x10.show());

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

//*************************************************;

x4.sh1(x7);

x4.sh1(x8);

x4.sh1(x9);

x4.sh1(x10);

System.out.println(x4.getDepartment()+"：员工有"+x4.getSum()+"个");

}

}

//************************************************

package com01;

/**

 * 职位类；

 * @author Administrator

 *

 */

public class com001 {

private String job;

private String jobnamber;

//*****************************************************;

public com001(){

}

public com001(String job,String jobnamber){

this.setJob(job);

this.setJobnamber(jobnamber);

}

//******************************************************;

public String getJob() {

return job;

}

public void setJob(String job) {

this.job = job;

}

public String getJobnamber() {

return jobnamber;

}

public void setJobnamber(String jobnamber) {

this.jobnamber = jobnamber;

}

//******************************************************;

package com03;

import com04.com004;

/**

 * 部门类；

 * @author Administrator

 *

 */

public class com002 {

private String department;

private String denamber;

private com004[] mycom004;

private int sum;

//***********************************************************;

public com002(){

}

public com002(String department,String denamber){

this.setDepartment(department);

this.setDenamber(denamber);

}

public com002(String department,String denamber,com004[] mycom004,int sum){

this.setDepartment(department);

this.setDenamber(denamber);

this.setMycom004(mycom004);

this.setSum(sum);

}

//************************************************************;

public String getDepartment() {

return department;

}

public void setDepartment(String department) {

this.department = department;

}

public String getDenamber() {

return denamber;

}

public void setDenamber(String denamber) {

this.denamber = denamber;

}

public com004[] getMycom004() {

if(this.mycom004==null){

this.mycom004= new com004[100];

}

return mycom004;

}

public void setMycom004(com004[] mycom004) {

this.mycom004 = mycom004;

}

public int getSum() {

return sum;

}

public void setSum(int sum) {

this.sum = sum;

}

//************************************************************;

public void sh1(com004 st){

for(int i=0;i<this.getMycom004().length;i++){

if(this.getMycom004()[i]==null){

this.getMycom004()[i]=st;

this.sum=i+1;

return;

}

}

}

//*********************************************

package com04;

import com01.com001;

import com03.com002;

public class com004 {

private String name;

private int age;

private String sex;

private com001 mycom001;

private com002 mycom002;

//******************************************************;

public com004(){

}

public com004(String name,int age,String sex){

this.setName(name);

this.setAge(age);

this.setSex(sex);

}

public com004(String name,int age,String sex,com001 mycom001,com002 mycom002){

this.setName(name);

this.setAge(age);

this.setSex(sex);

this.setMycom001(mycom001);

this.setMycom002(mycom002);

}

    //******************************************************;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public int getAge() {

return age;

}

public void setAge(int age) {

if(age<18||age>65){

this.age=18;

}else

    this.age=age;

}

public String getSex() {

return sex;

}

public void setSex(String sex) {

if(sex.equals("男")||sex.equals("女")){

this.sex=sex;

}else

    this.sex = "男";

}

public com001 getMycom001() {

return mycom001;

}

public void setMycom001(com001 mycom001) {

this.mycom001 = mycom001;

}

public com002 getMycom002() {

return mycom002;

}

public void setMycom002(com002 mycom002) {

this.mycom002 = mycom002;

}

//****************************************************;

public String show(){

String str="员工信息如下：\n名字："+this.getName()+"\n年龄："+this.getAge()+"\n性别："+this.getSex()+"\n职位："+this.getMycom001().getJob()+"\n职位编号："+this.getMycom001().getJobnamber()+"\n部门："+this.getMycom002().getDepartment()+"\n部门编号："+this.getMycom002().getDenamber();

return str;

}