不了解记忆功能
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) throws Exception {
System.out.println(CONTEXT);
Scanner scan = new Scanner(System.in);
Goddess g = new Goddess();
ActionGoddess ag = new ActionGoddess();
String prenious = null;
int step = 1;
while(scan.hasNext()){
String in=scan.next().toString();
if(OPERATION_EXIT.equals(in.toUpperCase()) //退出
||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_DELETE.equals(in.toUpperCase()) //删除女神
||OPERATION_DELETE.substring(0, 1).equals(in.toUpperCase())) {
}else if(OPERATION_QUERY.equals(in.toUpperCase()) //查询全部女神信息
||OPERATION_QUERY.substring(0, 1).equals(in.toUpperCase())){
List<Goddess> goddesses = ag.query();
for (int i=0;i<goddesses.size();i++)
System.out.println(goddesses.get(i).toString());
}else if(OPERATION_ADD.equals(in.toUpperCase()) //增加女神
||OPERATION_ADD.substring(0, 1).equals(in.toUpperCase())
||OPERATION_ADD.equals(prenious)){
prenious = OPERATION_ADD;
if(step == 1){
System.out.println("请输入女神的姓名：");
}else if(step == 2){
g.setUser_name(in);
System.out.println("请输入女神的年龄：");
}else if(step == 3){
g.setAge(Integer.valueOf(in));
System.out.println("请输入女神的生日：（例如：yyyy-MM-dd）");
}else if(step==4){
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
try {
Date data = sdf.parse(in);
g.setBirthday(data);
System.out.println("请输入女神的邮箱：");
} catch (ParseException e) {
e.printStackTrace();
step = 3;
}
}else if(step == 5){
g.setEmail(in);
System.out.println("请输入女神的电话号码：");
}else if (step==6){
g.setMobile(in);
try {
ag.addGoddess(g);
System.out.println("新增女神成功");
} catch (Exception e) {
e.printStackTrace();
System.out.println("新增女神失败");
}
}
if (prenious.equals(OPERATION_ADD))
step++;
}
}
}
}OPERATION_ADD.equals(prenious) 和 prenious = OPERATION_ADD;
是什么意思？记忆功能是怎么用的？
