1:完善menu注册功能,抽奖,看小故事等功能。
package Blue; import java.util.Scanner; import java.util.Random; public class zuoye { public static void main(String[] args) { // TODO Auto-generated method stub 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(); case 2: zhuche(); case 3: choujiang(); case 4: gushi(); case 5: tuichu(); break; } } 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 zhuche() { Scanner input = new Scanner(System.in); System.out.println("设置用户名为:zs"); String uname = input.next(); System.out.println("设置密码为:123"); String upwd = input.next(); if(uname.equals("zs")&&upwd.equals("123")) { System.out.println("注册成功"); returnMain(); } else { System.out.println("注册失败,请重新设置"); zhuche(); } } public static void choujiang() { Scanner input = new Scanner(System.in); System.out.println("请请输入四位数会员号"); int a = input.nextInt(); int b=0; b=a/100%10; Random r=new Random(); int s=r.nextInt(10); System.out.println(s); if(b==s) { System.out.println("恭喜您成为幸运会员"); returnMain(); }else { System.out.println("不好意思您不是幸运会员"); returnMain(); } } public static void gushi() { System.out.println("此前有座山,山上有座庙,庙里有个和尚。有一天,一个老和尚对小和尚说······,后续敬请期待!"); returnMain(); } public static void tuichu() { 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1*2*3*4*5。 [必做题]
package Blue; public class get { public static void main(String[] args) { // TODO 自动生成的方法存根 System.out.println(jc(5)); } public static int jc(int x){//加static关键字后,不需要new对象,可以通过类名调用方法// 静态方法调用方便 int sum=1; for (int i = 1; i <=x; i++) { sum*=i; } return sum; } }
3.编写一个方法,判断该年份是平年还是闰年。
package Blue; import java.util.Scanner; public class get { public static void main(String[] args) { // TODO 自动生成的方法存根 System.out.println("请输入年份:"); Scanner input = new Scanner(System.in); int i = input.nextInt(); nian(i); } public static void nian(int i){ if(i%4==0||i%100!=0&&i%400==0) { System.out.println(i+"是闰年"); } else { System.out.println(i+"是平年"); } } }