1:完善menu注册功能,抽奖,看小故事等功能
package method; import java.util.Random; import java.util.Scanner; public class Menu { 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"); 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: registerNatives(); break; case 3: choujiang(); break; case 4: look(); break; case 5: esc(); break; default: System.out.println("输入有误请重新输入:"); mainMenu(); } } public static void registerNatives() { System.out.println("请输入用户名:"); Scanner input = new Scanner(System.in); input.nextLine(); System.out.println("请输入密码:"); input.nextLine(); System.out.println("注册完成"); returnMain(); } public static void choujiang() { System.out.println("请输入四位会员卡号"); Random sj = new Random(0 - 9); Scanner input = new Scanner(System.in); int x = input.nextInt(); int y = sj.nextInt(); int z = (x % 100) / 10; if (z == y) { System.out.println("恭喜您成为幸运会员"); } else { System.out.println("很抱歉您不是幸运会员"); } returnMain(); } private static void login() { // TODO Auto-generated method astub 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 look() { System.out.println("请输入您想要看的故事名称"); Scanner input = new Scanner(System.in); input.next(); System.out.println("感谢您的观看"); returnMain(); } public static void esc() { System.out.println("谢谢您的使用"); } }
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?
package computer; import java.util.Scanner; public class wm { public static double jc(int a){ int x=1; for(int i=1;i<=a;i++){ x*=i; } return x; } public static void main(String[] args) { // TODO Auto-generated method stub Scanner input= new Scanner(System.in); System.out.println("请输入数字:"); int i=input.nextInt(); System.out.println("阶乘等于:"+jc(i)); } }
3.编写一个方法,判断该年份是平年还是闰年。
package computer; public class wm { public static void main(String[] args) { near(1991); } public static void near(int y){ if (y % 4 == 0 && y % 100 != 0 || y % 400 == 0) { System.out.println(y + "年是闰年"); } else { System.out.println(y + "年不是闰年"); } } }