该篇博文主要是体现了接口和类的公用性，

Emp的实体类：

package org.entity;import java.util.Date;/*** Emp entity. @author MyEclipse Persistence Tools*/public class Emp implements java.io.Serializable {// Fieldsprivate Integer empno;private String ename;private String job;private Short mgr;private Date hiredate;private Double sal;private Double comm;/** default constructor */public Emp() {}/** minimal constructor */public Emp(Integer empno) {this.empno = empno;}// Property accessorspublic Integer getEmpno() {return this.empno;}public void setEmpno(Integer empno) {this.empno = empno;}public String getEname() {return this.ename;}public void setEname(String ename) {this.ename = ename;}public String getJob() {return this.job;}public void setJob(String job) {this.job = job;}public Short getMgr() {return this.mgr;}public void setMgr(Short mgr) {this.mgr = mgr;}public Date getHiredate() {return this.hiredate;}public void setHiredate(Date hiredate) {this.hiredate = hiredate;}public Double getSal() {return this.sal;}public void setSal(Double sal) {this.sal = sal;}public Double getComm() {return this.comm;}public void setComm(Double comm) {this.comm = comm;}}