数组存储100名职员信息的管理系统

package com.niit.book;

import java.util.Scanner;

import com.niit.dbcenter.DBcenter;
import com.niit.entity.Employee;

/**
 * @author: Annie
 * @date：2016年5月15日
 * @description:运行程序，调用增删查改方法
 */
public class EmployeeMain {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("请输入要存入的雇员人数：");
        int number = in.nextInt();
        Employee [] employee = new Employee[number];
        DBcenter db = new DBcenter();
        while(true){
            System.out.println("请输入要执行的操作");
            System.out.println("------Menu-------");
            System.out.println("1.add Data");
            System.out.println("2.Update Data");
            System.out.println("3.Display Data");
            System.out.println("4:delete Date");
            System.out.println("5.Exit");
            System.out.println("---------");
            int num = in.nextInt();
            switch(num){
            case 1 :
                db.addDate(employee);
                break;
            case 2:
                db.updateDate(employee);
                break;
            case 3:
                db.displayDate(employee);
                break;
            case 4:
                db.DeleteDate(employee);
                break;

            case 5:
                System.exit(0);
                break;
            }
        }

    }

}

/**
 * 
 */
package com.niit.entity;

/**
 * @author: Annie
 * @date：2016年5月15日
 * @description:雇员的基本信息
 */
public class Employee {
    private int id;
    private String name;
    private String tel;
    private String addr;
    private String birthday;
    private String maritalStatus;
    
    public int getID() {
        return id;
    }
    public void setID(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getTel() {
        return tel;
    }
    public void setTel(String tel) {
        this.tel = tel;
    }
    public String getAddr() {
        return addr;
    }
    public void setAddr(String addr) {
        this.addr = addr;
    }
    public String getBirthday() {
        return birthday;
    }
    public void setBirthday(String birthday) {
        this.birthday = birthday;
    }
    public String getMaritalStatus() {
        return maritalStatus;
    }
    public void setMaritalStatus(String maritalStatus) {
        this.maritalStatus = maritalStatus;
    }
    
    public String toString(){
        String msg = this.id+"\t"+this.name+"\t"+this.tel+"\t\t"+this.addr+"\t"+this.birthday+"\t"+this.maritalStatus;
        return msg;
        
    }

}

/**
 * 
 */
package com.niit.dbcenter;

import java.util.Scanner;

import com.niit.entity.Employee;

/**
 * @author: Annie
 * @date：2016年5月15日
 * @description:对雇员进行增删查改
 */
public class DBcenter {
    Scanner in =new Scanner(System.in);
    String msg = "编号"+"\t"+"姓名"+"\t"+"手机号"+"\t\t"+"地址"+"\t"+"生日"+"\t"+"婚姻状况";

    /*判断数组中是否有空的位置，如果没有，则不装，如果有，则装
     * 
     */
    public int setIndext(Employee [] arr){
        for (int i = 0; i < arr.length; i++) {
            if(arr[i]==null){
                return i;
            }
        }
        return 999;

    }

    /*用于输出学生信息，即刷新信息*/
    public void print(Employee [] arr){
        System.out.println(msg);
        for (int i = 0; i < arr.length; i++) {
            //判断是否存在
            if(arr[i]!=null){
                System.out.println(arr[i]);
            }
        }

    }
    /*用于判断雇员是否存在*/
    public boolean exsit(int id,Employee  arr){
        if (arr!=null) {
            if(arr.getID() == id){
                return true;
            }else{
                return false;
            }
        }
        return false;


    }
    /*    增加雇员*/
    public void addDate(Employee[] arr){
        System.out.println("请输入雇员的姓名：");
        String  name = in.next();
        System.out.println("请输入雇员的手机号：");
        String  tel = in.next();
        System.out.println("请输入雇员的地址：");
        String  addr = in.next();
        System.out.println("请输入雇员的生日：");
        String  birthday = in.next();
        System.out.println("请输入雇员的婚姻状况");
        String maritalStatus = in.next();
        Employee employee = new Employee();
        employee.setName(name);
        employee.setAddr(addr);
        employee.setBirthday(birthday);
        employee.setTel(tel);
        employee.setMaritalStatus(maritalStatus);
        int i = this.setIndext(arr);
        employee.setID(i);
        if(i==999){
            System.out.println("人数已经达到了最大，不能再添加了");
        }else{
            arr[i]=employee;
            this.print(arr);
        }
    }
    /*删除雇员*/
    public void DeleteDate(Employee[] arr){
        System.out.println("请输入要删除雇员的id:");
        int id = in.nextInt();
        for (int i = 0; i < arr.length; i++) {
            if(this.exsit(id, arr[i])){
                arr[i]=null;
                System.out.println("---学生信息删除成功---");
                this.print(arr);
                return;
            }
        }
        System.out.println("你所指定的学生不存在");

    }

    /*查询雇员:通过id来查找*/
    public void displayDate(Employee[] arr){
        System.out.println("请输入要查询雇员的编号：");
        int id =in.nextInt();
        for (int i = 0; i < arr.length; i++) {
            if(this.exsit(id, arr[i])){
                this.print(arr);
                return;
            }    
        }
        System.out.println("此学生不存在");
    }
    /*    修改雇员:通过id来更新*/
    public void updateDate(Employee [] arr){
        System.out.println("请输入要更新的雇员id");
        int id = in.nextInt();
        for (int i = 0; i < arr.length; i++) {
            if(this.exsit(id, arr[i])){
                System.out.println("请输入"+arr[i].getName()+"修改的姓名：");
                String  name = in.next();
                System.out.println("请输入"+arr[i].getName()+"修改的手机号：");
                String  tel = in.next();
                System.out.println("请输入"+arr[i].getName()+"修改的地址：");
                String  addr = in.next();
                System.out.println("请输入"+arr[i].getName()+"修改的生日：");
                String  birthday = in.next();
                System.out.println("请输入"+arr[i].getName()+"修改的婚姻状况");
                String maritalStatus = in.next();
                arr[i].setName(name);
                arr[i].setAddr(addr);
                arr[i].setBirthday(birthday);
                arr[i].setTel(tel);
                arr[i].setMaritalStatus(maritalStatus);
                System.out.println("----更新成功----");
                this.print(arr);
            }

        }

    }

}