Java第十次作业
Posted 杨思论
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1.编写一个方法,实现冒泡排序(由小到大),并调用该方法
import java.util.Arrays; import java.util.Random; public class diyi { public static void main(String[] args) { int[] array= new int[7]; Random random = new Random(); for (int i = 0; i < array.length; i++) { array[i] = random.nextInt(100); } System.out.println("该随机数生成的数组:"+Arrays.toString(array)); bubble(array); } private static void bubble(int[] array) { for (int i = 0; i < array.length-1; i++) { for (int j = 0; j < array.length-1-i; j++) { if(array[j]>array[j+1]){ int temp =array[j]; array[j]=array[j+1]; array[j+1]=temp; } } } System.out.println(Arrays.toString(array)); for (int i = 0; i < array.length; i++) { System.out.println(array[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。 [必做题]
public class jiechen { public static void main(String[] args) { int sum=getSum(5); System.out.println("阶乘="+sum); } public static int getSum(int num) { int result = 1; for(int i = 1;i<=num;i++){ result *= i; } return result; } }
3.编写一个方法,判断该年份是平年还是闰年。[必做题]
import java.util.Scanner; public class nianfeng { public static void main(String []args) { year(); } public static void year() { int year; System.out.println("请输入年份:"); Scanner scan = new Scanner(System.in); year= scan.nextInt(); if (year%400==0||year%4==0&&year%100!=0) { System.out.println(year+"是闰年"); } else { System.out.println(year+"是平年"); } } }
4.课堂没完成的menu菜单,实现幸运抽奖功能
import java.util.Random; import java.util.Scanner; public class choujiang { 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"); System.out.println("请选择"); int i=input.nextInt(); switch(i){ case 1: login(); break; case 2: reg(); break; case 3: lucky(); } } private static void lucky() { // 输入四位会员卡号,如果百位数等于随机数,幸运会员。否则不是。同时也要询问是否返回主菜单 Random r=new Random(); int a=r.nextInt(10); System.out.println("("+a+")"); Scanner input=new Scanner(System.in); System.out.println("输入四位会员卡号"); int kahao= input.nextInt(); while (kahao < 1000 || kahao > 10000) { System.out.println("输入错误,重新输入"); kahao = input.nextInt(); if (kahao >= 1000 && kahao < 10000) { break; } } int bai=kahao%1000/100; if (bai == a) { System.out.println("是幸运会员"); } else { System.out.println("不是幸运会员"); } returnMain(); } public static void returnMain(){ Scanner input=new Scanner(System.in); System.out.println("是否返回主菜单?"); if(input.next().equalsIgnoreCase("Y")) mainMenu(); else System.out.println("谢谢使用"); } public static void reg() { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("输入要注册的用户名"); String uname=input.next(); System.out.println("输入注册密码"); String upwd=input.next(); System.out.println("注册成功"); returnMain(); } 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 upwd=input.next(); if(uname.equals("zs")&&upwd.equals("123")){ System.out.println("ok"); }else{ System.out.println("fail"); } returnMain(); } public static void main(String[] args) { mainMenu(); } }
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