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,输入四位会员卡号,如果百位等于系统随机数,就是星运会员.否则不是.");
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:
choujiang();
break;
case 4:
sgs();
break;
case 5:
break;
}
}
private static void sgs() {
System.out.println("一个小故事");
returnMain();
}
private static void choujiang() {
Random r=new Random();
int i1 = r.nextInt(10);
System.out.println("请输入四位会员卡号");
Scanner input = new Scanner(System.in);
int i = input.nextInt();
if (i1==i%1000/100){
System.out.println("恭喜你中奖了");
}else {
System.out.println("很遗憾你没有中奖");
}
returnMain();
}
private 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 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");
}
}
public static void zhuce(){
System.out.println("请输入用户名");
Scanner input = new Scanner(System.in);
String line = input.nextLine();
System.out.println("请输入密码");
int i = input.nextInt();
login();
}
}
public static void cj() {
int sum=1;
for(int i=1;i<=4;i++) {
sum*=i;
}
System.out.println("4的阶乘="+sum);
}
public static void main(String[] args){
// TODO 自动生成的方法存根
cj();
}
}
public static void main(String[] args) {
prn(2018);
}
public static void prn(int year) {
if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
System.out.println(year + "年是闰年");
} else {
System.out.println(year + "年不是闰年");
}
}