Java简单类（部门、领导、雇员关系）

 class Dept {
     private int deptno ;
     private String dname ;
     private String loc ;
     private Emp emps [] ;    //多个雇员
     public void setEmps(Emp [] emps) {
         this.emps = emps ;
     }
     public Emp[] getEmps() {
         return this.emps ;
     }
     public Dept(int deptno,String dname,String loc){
         this.deptno = deptno ;
         this.dname = dname ;
         this.loc = loc ;
     }
     public String getInfo() {
         return "部门编号：" + this.deptno + "，名称：" + this.dname + "，位置：" + this.loc ;
     }
 }
 class Emp {
     private int empno ;
     private String ename ;
     private String job ;
     private double sal ;
     private double comm ;
     private Dept dept ;//表示对应的部门信息
     private Emp mgr ;  //表示雇员对应的领导
     public void setMgr(Emp mgr) {
         this.mgr = mgr ;
     }
     public Emp getMgr() {
         return this.mgr ;
     }
     public void setDept(Dept dept){
         this.dept = dept ;
     }
     public Dept getDept() {
         return this.dept ;
     }
     public Emp(int empno,String ename,String job,double sal,double comm){
         this.empno = empno ;
         this.ename = ename ;
         this.job = job ;
         this.sal = sal ;
         this.comm = comm ;
     }
     public String getInfo(){
         return "雇员编号：" + this.empno + "，姓名：" + this.ename + "，职位：" + this.job + "，工资：" + this.sal + "，佣金：" + this.comm ;
     }
 }
 public class  Test2 {
     public static void main(String args[]) {
         Dept dept = new Dept(10,"ACCOUNTING","CHINA") ;  //部门信息
         Emp ea = new Emp(7369,"CHEN","CLERK",800.0,0.0);//雇员信息
         Emp eb = new Emp(7902,"PENG","MANAGER",2500.0,0.0);//雇员信息
         Emp ec = new Emp(7719,"KING","PRESIDENT",5000.0,0.0);//雇员信息
         ea.setMgr(eb) ; //雇员与领导
         eb.setMgr(ec) ; //雇员与领导
         ea.setDept(dept) ; //雇员与部门
         eb.setDept(dept) ; //雇员与部门
         ec.setDept(dept) ; //雇员与部门
         dept.setEmps(new Emp[]{ea,eb,ec}) ;
         System.out.println(ea.getInfo()) ;//通过雇员找到领导信息和部门信息
         System.out.println("\t|-"+ ea.getMgr().getInfo()) ;
         System.out.println("\t|-"+ ea.getDept().getInfo()) ;
         System.out.println("----------------------------------------") ;
         System.out.println(dept.getInfo()) ;//根据部门找到所有的雇员以及每个雇员的领导信息
         for (int x = 0 ;x < dept.getEmps().length ;x ++ ){
             System.out.println("\t|-"+ dept.getEmps()[x].getInfo()) ;
             if (dept.getEmps()[x].getMgr() != null){
                 System.out.println("\t|-"+dept.getEmps()[x].getMgr().getInfo()) ;
             }
         }
     }
 }

一个部门中有多个雇员，每个雇员有一个领导或者没有领导