JAVA第十次作业
1.编写一个方法,实现冒泡排序(由小到大),并调用该方法
package ccc; public class bbb { public static void maopao(int []a){ for (int i = 0; i < b.length-1; i++) { for (int j = 0; j < c.length-1-i; j++) { if(b[j]>c[j+1]) { int temp=a[j]; b[j]=b[j+1]; b[j+1]=temp; } } } } public static void main(String[] args) { // TODO Auto-generated method stub int x[]={6,8,2,9,5,7,1,}; maopao(x); for (int i = 0; i < x.length; i++) { System.out.println(x[i]); } } }
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 ccc; public class bbb{ // 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] public static int jiecheng(int n){ int sum=1; for (int i=n; i>0; i--) { sum=sum*i; } return sum; } public static void main(String[] args) { System.out.println(jiecheng(5)); } }
3.编写一个方法,判断该年份是平年还是闰年。[必做题]
package aaa; import java.util.Scanner; public class bbb{ public static void nian(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+"年是平年"); } public static void main(String[] args) { Scanner input=new Scanner(System.in); System.out.println("输入年份:"); int year=input.nextInt(); nian(year); } }
4.课堂没完成的menu菜单,实现幸运抽奖功能
package aaa; import java.util.Scanner; public class bbb { public static void mainMenu() { Scanner input = new Scanner(System.in); System.out.println("欢迎使用本系统"); System.out.println("1.登录"); System.out.println("2.注册"); System.out.println("3.幸运抽奖"); System.out.println("4.退出系统"); System.out.println("请选择:"); int i = input.nextInt(); switch (i) { case 1: login(); break; case 2: register(); break; case 3: xycj(); } } public static void returnMain() { Scanner input = new Scanner(System.in); System.out.println("是否返回主菜单?Y/N"); if (input.next().equalsIgnoreCase("Y")) mainMenu(); else System.out.println("谢谢使用"); } public static void login() { 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 pwd = input.next(); if (uname.equals("admin") && pwd.equals("admin")) System.out.println("成功"); else System.out.println("失败"); returnMain(); } public static void register() { 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 pwd = input.next(); System.out.println("注册成功"); returnMain(); } public static void xycj() { Scanner input = new Scanner(System.in); System.out.println("请输入四位数卡号:"); int kahao = input.nextInt(); int random = (int) (Math.random() * 10); if (random == kahao / 100 % 10) { System.out.println("恭喜你是幸运会员!"); } else { System.out.println("幸运数是:" + random); System.out.println("很遗憾你不是幸运会员!"); } returnMain(); } public static void main(String[] args) { mainMenu(); } }