请看代码if(...){step++;}和step++;有什么区别？

package com.imooc.view;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Scanner;

import com.imooc.action.GoddessAction;
import com.imooc.model.Goddess;

public class View {

private static final String CONTEXT="欢迎来到女神禁区：\n" +
        "下面是女神禁区的功能列表：\n" +
        "[MAIN/M]:主菜单\n" +
        "[QUERY/Q]:查看全部女神的信息\n" +
        "[GET/G]:查看某位女神的详细信息\n" +
        "[ADD/A]:添加女神信息\n" +
        "[UPDATE/U]:更新女神信息\n" +
        "[DELETE/D]:删除女神信息\n" +
        "[SEARCH/S]:查询女神信息(根据姓名、手机号来查询)\n" +
        "[EXIT/E]:退出女神禁区\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) {

    System.out.println(CONTEXT);
    //怎么保持程序一直运行

    Scanner scan=new Scanner(System.in);
    Goddess goddess=new Goddess();
    GoddessAction action=new GoddessAction();
    String prenious=null;
    Integer step=1;
    while(scan.hasNext()){
        String in=scan.next().toString();
        if(OPERATION_EXIT.equals(in.toUpperCase())
                ||OPERATION_EXIT.substring(0, 1).equals(in.toUpperCase())){
            System.out.println("您已成功退出女神禁区。");
            break;
        }else if(OPERATION_QUERY.equals(in.toUpperCase())
                ||OPERATION_QUERY.substring(0, 1).equals(in.toUpperCase())){
            try {
                List<Goddess> list=action.query();
                for (Goddess go : list) {
                    System.out.println(go.getId()+",姓名："+go.getUser_name());
                }
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }


        }else if(OPERATION_ADD.equals(in.toUpperCase())
                ||OPERATION_ADD.substring(0, 1).equals(in.toUpperCase())
                ||OPERATION_ADD.equals(prenious)){
            prenious=OPERATION_ADD;
            //新增女神

            if(1==step){
                System.out.println("请输入女神的［姓名］");
            }else if(2==step){
                goddess.setUser_name(in);
                System.out.println("请输入女神的［年龄］");
            }else if(3==step){
                goddess.setAge(Integer.valueOf(in));
                System.out.println("请输入女神的［生日］，格式如：yyyy-MM-dd");
            }else if(4==step){
                SimpleDateFormat sf=new SimpleDateFormat("yyyy-MM-dd");
                Date birthday=null;
                try {
                    birthday = sf.parse(in);
                    goddess.setBirthday(birthday);
                    System.out.println("请输入女神的［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(5==step){
                goddess.setEmail(in);
                System.out.println("请输入女神的［手机号］");
            }else if(6==step){
                goddess.setMobile(in);

                try {
                    action.add(goddess);
                    System.out.println("新增女神成功");
                } catch (Exception e) {
                    e.printStackTrace();
                    System.out.println("新增女神失败");
                }
            }
            if(OPERATION_ADD.equals(prenious)){
                step++;         
            }
        }else{
            System.out.println("您输入的值为:"+in);               
        }

    }
}

}

都是加1，只是有if判断，符合条件的时候才加1，而没有if条件判断，都加1

if是条件符合的时候step才加1；