为啥每个单独的步骤执行就可以，组合在一起就有问题  ，还有更新两次 问题：第二次更新时更新不动，增加完 新信息，按其他按钮 不动。安老师写的增加代码。

我的代码：

package com.Demo.view;

import com.Demo.action.GoddessAction;
import com.Demo.model.Goddess;
import org.omg.Messaging.SYNC_WITH_TRANSPORT;

import java.sql.SQLException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;

public class View {

    private static final String CONTEXT="欢迎来到女生区：\n"+
            "下面是女生区的功能列表：\n"+
            "[MAIN/M]:主菜单\n"+
            "[QUERY/Q]:查看全部女生信息\n"+
            "[GET/G]:查看某位女生详细信息\n"+
            "[ADD/A]:添加女生信息\n"+
            "[UPDATE/U]:更新女生信息\n"+
            "[DELETE/D]:删除女生信息\n"+
            "[SEARCH/S]:查询女生信息（根据姓名、手机号来查询）\n"+
            "[EXIT/E]:退出女生区：\n"+
            "[BREAK/B]:退出当前功能，返回主菜单";


    private static final String OPERATION_MAIN="MAIN";
    private static final String OPERATION_QUERY="QUERY";
    private static final String OPERATION_GET="GET";
    private static final String OPERATION_ADD="ADD";
    private static final String OPERATION_UPDATE="UPDATE";
    private static final String OPERATION_DELETE="DELETE";
    private static final String OPERATION_SEARCH="SEARCH";
    private static final String OPERATION_EXIT="EXIT";
    private static final String OPERATION_BREAK="BREAK";


    public static void main(String[] args) throws ParseException {

        System.out.println(CONTEXT);
        Scanner scanner=new Scanner(System.in);
        Goddess goddess=new Goddess();
        GoddessAction goddessAction=new GoddessAction();
        String pernious=null;
        Integer step=1;
        Integer step1=1;
        Integer step2=1;
        Integer step3=1;
        Integer step4=1;


        List<Map<String,Object>> params= new ArrayList<Map<String, Object>>();
        Map<String,Object>param=new HashMap<String, Object>();

        //保持程序一直运行
        while(scanner.hasNext()){
            String input=scanner.next().toString();
            if(OPERATION_EXIT.equals(input.toUpperCase())
                    ||OPERATION_EXIT.substring(0,1).equals(input.toUpperCase())){
                System.out.println("您已成功退出女生区！");
                break;
            }else if(OPERATION_ADD.equals(input.toUpperCase())
                    ||OPERATION_ADD.substring(0,1).equals(input.toUpperCase())
                    ||OPERATION_ADD.equals(pernious)){
                pernious=OPERATION_ADD;

                //增加女生
                if(step==1){
                    System.out.println("请输入女生的[姓名]");
                }else if(step==2){
                    goddess.setUser_name(input);
                    System.out.println("请输入女生的[年龄]");
                }else if(step==3){
                    goddess.setAge(Integer.valueOf(input));
                    System.out.println("请输入女生的[生日]，如YYYY-MM-DD");
                }else if(step==4){
                    SimpleDateFormat simpleDateFormat=new SimpleDateFormat("YYYY-MM-DD");
                    Date birthday=null;
                    try{
                        birthday=simpleDateFormat.parse(input);
                        goddess.setBirthday(birthday);
                        System.out.println("请输入女生[邮箱]");
                    }catch (ParseException e){
                        e.printStackTrace();
                        System.out.println("您输入的格式有误，请重新输入");
                        step=3;
                    }
                }else if(step==5){
                    goddess.setEmail(input);
                    System.out.println("请输入女生[手机号]");
                }else if(step==6){
                    goddess.setMobile(input);

                    try {
                        goddessAction.add(goddess);
                        System.out.println("新增女生成功。");

                    } catch (SQLException e) {
                        e.printStackTrace();
                        System.out.println("新增女生失败！");
                    }
                }
                if(OPERATION_ADD.equals(pernious)){
                    step++;
                }


            }else if(OPERATION_QUERY.equals(input.toUpperCase())
                    ||OPERATION_QUERY.substring(0,1).equals(input.toUpperCase())){
                try {
                    List<Goddess>goddesses=goddessAction.query();
                    for (Goddess goddess1:goddesses){
                        System.out.println(
                                "ID:"+goddess1.getId()+" "+
                                "姓名："+goddess1.getUser_name()+" "+
                                "年龄："+goddess1.getAge()+" "+
                                "邮箱："+goddess1.getEmail()+" "+
                                "电话："+goddess1.getMobile());
                    }
                } catch (SQLException e) {
                    e.printStackTrace();
                }


            }else if(OPERATION_DELETE.equals(input.toUpperCase())
                    ||OPERATION_DELETE.substring(0,1).equals(input.toUpperCase())
                    ||OPERATION_DELETE.equals(pernious)){
                pernious=OPERATION_DELETE;
                if(step1==1){
                    try {
                        Goddess idList=null;
                        System.out.println("请输入要删除的女生ID：");
                        Integer out=scanner.nextInt();
                        for(int i=0;i<goddessAction.query().size();i++){

                        }

                        goddessAction.delete(out);
                        System.out.println("删除成功！");


                    } catch (Exception e) {
                        System.out.println("输入的格式有误，请重新输入[数字]：");
                        step=0;
                    }
                }
                if(OPERATION_DELETE.equals(pernious)){
                    step1++;
                }

            }else if(OPERATION_GET.equals(input.toUpperCase())
                    ||OPERATION_GET.substring(0,1).equals(input.toUpperCase())
                    ||OPERATION_GET.equals(pernious)){
                pernious=OPERATION_GET;
                if(step2==1){
                    try {
                        System.out.println("请输入要查看女生的ID：");
                        Integer in=scanner.nextInt();
                        Goddess goddess2=goddessAction.get(in);
                        System.out.println(goddess2.toString());
                        //continue;
                    }catch (Exception e) {
                        System.out.println("您输入的女生ID格式有误，格式[数字]");
                        step2=0;
                    }
                }
                if(OPERATION_GET.equals(pernious)){
                    step2++;
                }

            }else if(OPERATION_SEARCH.equals(input.toUpperCase())
                    ||OPERATION_SEARCH.substring(0,1).equals(input.toUpperCase())){
                pernious=OPERATION_SEARCH;
                if(step3==1) {


                    try {
                        List<Goddess> goddesses = null;
                        System.out.println("请输入女生的姓名:");
                        String name = scanner.next();
                        System.out.println("请输入女生的手机号：");
                        String mobile = scanner.next();

                        param = new HashMap<String, Object>();
                        param.put("name", "user_name");
                        param.put("rela", "=");
                        String realName = "'" + name + "'";
                        param.put("value", realName);
                        params.add(param);
                        param = new HashMap<String, Object>();
                        param.put("name", "mobile");
                        param.put("rela", "=");
                        String realMobile = "'" + mobile + "'";
                        param.put("value", realMobile);
                        params.add(param);

                        goddesses = (List<Goddess>) goddessAction.query(params);
                        for (int i = 0; i < goddesses.size(); i++) {
                            System.out.println("查询到的信息为：");
                            System.out.println(goddesses.get(i).toString());
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                        System.out.println("未查到任何相关信息，请重新输入");
                        step3=0;
                    }
                }
                if(pernious.equals(OPERATION_SEARCH)){
                    step3++;
                }


            }else if(OPERATION_MAIN.equals(input.toUpperCase())
                    ||OPERATION_MAIN.substring(0,1).equals(input.toUpperCase())){
                System.out.println(CONTEXT);
            }else if(OPERATION_BREAK.equals(input.toUpperCase())
                    ||OPERATION_BREAK.substring(0,1).equals(input.toUpperCase())){
                System.out.println("你已退出女生区！");
                     break;

            }else if(OPERATION_UPDATE.equals(input.toUpperCase())
                    ||OPERATION_UPDATE.substring(0,1).equals(input.toUpperCase())
                    ||OPERATION_UPDATE.equals(pernious)) {

                pernious=OPERATION_UPDATE;
                if(step4==1){
                    try {
                        System.out.println("请输入要修改女生的ID：");
                        Integer inId=scanner.nextInt();
                        Goddess goddess2=goddessAction.get(inId);
                        System.out.println(goddess2.toString());
                        goddess.setId(inId);
                        step4=2;
                    }catch (Exception e) {
                        System.out.println("您输入的女生ID格式有误，格式[数字]");
                        step=0;
                    }
                }
                if(step4==2){
                    System.out.println("请输入更改后女生的姓名:");
                }else if(step4==3){
                    goddess.setUser_name(input);
                    System.out.println("请输入更改后女生年龄:");
                }else if(step4==4){
                    goddess.setAge(Integer.valueOf(input));
                    System.out.println("请输入改后女生生日：");
                }else if(step4==5){
                    SimpleDateFormat simpleDateFormat=new SimpleDateFormat("YYYY-MM-DD");
                    Date birthday=null;
                    try{
                        birthday=simpleDateFormat.parse(input);
                        goddess.setBirthday(birthday);
                        System.out.println("请输入女生[邮箱]");
                    }catch (ParseException e){
                        e.printStackTrace();
                        System.out.println("您输入的格式有误，请重新输入");
                        step4=4;
                    }

                }else if (step4==6){
                    goddess.setEmail(input);
                    System.out.println("请输入更改后女生手机号：");
                }else if (step4==7){
                    goddess.setMobile(input);
                    System.out.println("请输入更新者");
                }else if(step4==8){
                    goddess.setUpdate_user(input);
                    try {
                        goddessAction.update(goddess);
                        System.out.println("更新成功！");

                    } catch (SQLException e) {
                        e.printStackTrace();
                    }
                }

                if(OPERATION_UPDATE.equals(pernious)){
                    step4++;
                }

            }else {
                System.out.println("您输入的方式有误");
                System.out.println(CONTEXT);
            }


        }


    }
}