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("	|-"+ ea.getMgr().getInfo()) ;
        System.out.println("	|-"+ 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("	|-"+ dept.getEmps()[x].getInfo()) ;
            if (dept.getEmps()[x].getMgr() != null){
                System.out.println("	|-"+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