1:完善menu注册功能,抽奖,看小故事等功能
package APPLE;
import java.util.Random;
import java.util.Scanner;
public class helloworld {
public static void main(String[] args) {
mainMenu();
}
public static void mainMenu() {
Scanner input = new Scanner(System.in);
System.out.println("1.登录");
System.out.println("2.注册");
System.out.println("3.幸运抽奖.");
System.out.println("4.看小故事,");
System.out.println("5.退出系统");
System.out.println("请选择");
int i = input.nextInt();
switch (i) {
case 1:
login();
break;
case 2:
zhuce();
break;
case 3:
xingyuncj();
break;
case 4:
xiaogushi();
break;
case 5:
tuichu();
break;
}
}
public static void login() {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.println("输入用户名");
String uname = input.next();
System.out.println("输入密码");
String upwd = input.next();
if (uname.equals("zs") && upwd.equals("123")) {
System.out.println("登录成功");
} else {
System.out.println("登录失败");
}
returnMain();
}
public static void zhuce() {
Scanner input = new Scanner(System.in);
System.out.println("用户名");
String uname = input.next();
System.out.println("密码");
String upwd = input.next();
if(uname.equals(null) || upwd.equals(null) ) {
System.out.println("注册失败");
}else {
System.out.println("注册成功");
}
returnMain();
}
public static void xingyuncj() {
System.out.println("1.作弊模式");
System.out.println("2.正常模式");
Scanner input = new Scanner(System.in);
int x=input.nextInt();
switch(x) {
case 1:
zuobi();
break;
case 2:
zhengchang();
break;
}
}
public static void zuobi() {
Scanner input = new Scanner(System.in);
System.out.println("作弊模式：");
Random r=new Random();
int sjs=r.nextInt(10);
System.out.println(sjs);
System.out.println("请输入四位会员数");
int num=input.nextInt();
if(num/100%10==sjs) {
System.out.println("恭喜你，是幸运会员");
}else {
System.out.println("祝你下次好运");
}
returnMain();
}
public static void zhengchang() {
Scanner input = new Scanner(System.in);
System.out.println("正常模式");
Random r=new Random();
int sjs=r.nextInt(10);
System.out.println("请输入四位会员数");
int num=input.nextInt();
if(num/100%10==sjs) {
System.out.println("恭喜你，是幸运会员");
}else {
System.out.println("祝你下次好运");
}
returnMain();
}
public static void xiaogushi() {
System.out.println("把大象装进冰箱分成几个步骤");
System.out.println("1.冰箱门打开");
System.out.println("2.大象放进去");
System.out.println("3.冰箱门关上");
returnMain();
}
public static void tuichu() {
System.out.println("是否退出系统Y/N");
Scanner input = new Scanner(System.in);
String a = input.next();
if(a.equalsIgnoreCase("y")) {
System.out.println("退出系统成功");
}else {
returnMain();
}
}
public static void returnMain(){
System.out.println("是否返回主菜单?Y/N");
Scanner input = new Scanner(System.in);
if (input.next().equalsIgnoreCase("Y")) {
mainMenu();
}else{
System.out.println("谢谢使用");
}
}
}
2.编写一个方法，求整数n的阶乘 例如5的阶乘是5*4*3*2*1
public static int Jc(int n) {
int cj=1;
for (int i = 1; i <= n; i++) {
cj*=i;
}
return cj;
}
public static void main(String[] args) {
System.out.println(Jc(5));
}
}
3.编写一个方法 判断该年份是平年还是闰年
public static void Year(int n) {
if (n % 4 == 0 && n % 100 != 0 || n % 400 == 0) {
System.out.println(n + "是闰年");
} else {
System.out.println(n + "是平年");
}
}
public static void main(String[] args) {
Year y = new Year();
Year(2023);
}