java编程案例
案例一：飞机票查看优惠系统
项目需求：
- 机票价格按照淡季旺季、头等舱和经济舱收费，输入机票原价、月份和头等舱或经济舱。
- 机票最终优惠价格的计算方案如下 ：旺季（5-10月）头等舱9折，经济舱8.5折，淡季（11月到来年4月)头等舱7折，经济舱6.5折。
代码实现：
package anli;import java.util.Scanner;public class planone { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("请您输入机票原价："); int price = sc.nextInt(); System.out.println("请您输入仓位类型（头等舱/经济舱）:"); String plantypes = sc.next(); System.out.println("请您输入月份(1-12)："); int month = sc.nextInt(); System.out.println("优惠后的价格为："+Preferential(price,plantypes,month)); } public static double Preferential(int price,String plantypes,int month){ if(month >= 5 && month <= 10){ switch (plantypes){ case "头等舱": price *= 0.9; break; case "经济舱": price *= 0.85; break; default: System.out.println("对不起，您输入的仓位有误~~~"); price = -1; } }else if(month == 11 || month == 12 || month >= 1 && month <= 4){ switch (plantypes) { case "头等舱": price *= 0.7; break; case "经济舱": price *= 0.65; break; default: System.out.println("对不起，您输入的仓位有误~~~"); price = -1; } }else { System.out.println("对不起，您输入的月份有误~~~"); price = -1; } return price; }}
案例二：获取素数
项目需求：判断101-200之间有多少个素数，并输出所有数据。
代码实现：
package anli;public class sushu { public static void main(String[] args) { int sum = 0; for (int i = 101; i <= 200; i++) { boolean flag = true; for (int j = 2; j < i / 2; j++){ if(i % j == 0){ flag = false; break; } } if(flag){ sum++; System.out.print(i+"\t"); } } System.out.println("共有"+sum+"个质数。"); }}案例三：验证码模块
项目需求：定义方法实现随机产生一个5位的验证码，每位可能是数字、大写字母、小写字母。
代码实现 ：
package anli;import java.util.Random;import java.util.Scanner;public class yanzhengma { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("请您输入验证码的位数："); int sum = sc.nextInt(); System.out.println("生成的验证码为："+createCode(sum)); } public static String createCode(int n){ String code = ""; Random r = new Random(); for (int i = 0; i < n; i++) { int type = r.nextInt(3); switch (type){ case 0: char chA = (char)(r.nextInt(26) + 65); code += chA; break; case 1: char cha = (char)(r.nextInt(26) + 97); code += cha; break; case 2: code += r.nextInt(10); break; } } return code; }}
案例四：数组元素的复制
项目需求：把一个数组中的元素复制到另一个新数组中去。
代码实现：
package anli;public class suzufuzhi { public static void main(String[] args) { int[] arr = {11,22,33,44,55,66,77,88,99}; int[] arr1 = new int[arr.length]; list(arr,arr1); System.out.println("原始数组为："); printarr(arr); System.out.println("复制的数组为："); printarr(arr1); } public static void list(int[] arr,int[] arr1){ for (int i = 0; i < arr.length; i++) { arr1[i] = arr[i]; } } public static void printarr(int[] arr){ System.out.print("["); for (int i = 0; i < arr.length; i++) { System.out.print(i == arr.length-1 ? arr[i] : arr[i]+", "); } System.out.println("]"); }}
案例五：评委打分
项目需求：在唱歌比赛中，有6名评委给选手打分，分数范围是[0 - 100]之间的整数。选手的最后得分为：去掉最高分、最低分后的4个评委的平均分，请完成上述过程并计算出选手的得分。
代码实现：
package anli;import java.util.Scanner;public class pingweidafen { public static void main(String[] args) { int[] scores = new int[6]; System.out.println("选手的最终得分为："+ scos(scores)); } public static float scos(int[] scores){ int min = scores[0],max = scores[0],sum = 0; Scanner sc = new Scanner(System.in); for (int i = 0; i < scores.length; i++) { System.out.println("请您输入第"+(i+1)+"位评委的打分："); int score = sc.nextInt(); scores[i] = score; } for (int i = 0; i < scores.length; i++) { if(scores[i]>max){ max = scores[i]; } if(scores[i]<min){ min = scores[i]; } sum+=scores[i]; } sum = (sum-min-max)/(scores.length-2); return sum; }}
案例六：数字加密程序
项目需求：某系统的数字密码：比如193，采用加密方式进行传输，规则如下：先得到每位数，然后每位数都加上5，在对10求余，最后将所有数字反转，得到一串新数。
代码实现：
package anli;import java.util.Scanner;public class mimajiami { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("请输入需要加密的数字的位数："); int length = sc.nextInt(); int [] arr = new int[length]; addarr(arr); System.out.println("加密的数字为："); printarr(arr); jiamiarr(arr); System.out.println("加密后的数字为："); printarr(arr); } public static void addarr(int[] arr){ Scanner sc = new Scanner(System.in); for (int i = 0; i < arr.length; i++) { System.out.println("请您输入加密的第"+(i+1)+"位数字"); int number = sc.nextInt(); arr[i] = number; } } public static void jiamiarr(int[] arr){ for (int i = 0; i < arr.length; i++) { arr[i] = (arr[i] + 5) % 10; } for (int i = 0,j = arr.length-1; i < j; i++,j--) { int temp = arr[j]; arr[j] = arr[i]; arr[i] = temp; } } public static void printarr(int[] arr){ for (int i = 0; i < arr.length; i++) { System.out.print(i == arr.length-1 ? arr[i]+"\n" : arr[i]); } }}
案例七：模拟双色球系统
项目需求：投注号码由6个红色球号码和一个蓝色球号码组成，红色球号码从1-33中选择；蓝色球号码从1-16中选择。
代码实现：
package anli;import java.util.Random;import java.util.Scanner;public class suangseqiu { public static void main(String[] args) { int[] lucknbr = cratenb(); int[] usernbr = usernubr(); judge(lucknbr,usernbr); } public static void judge(int[] lucknbr,int[] usernubr){ int redHitNub = 0; int blueHiMbr = 0; for (int i = 0; i < usernubr.length - 1; i++) { for (int j = 0; j < lucknbr.length - 1; j++) { if(usernubr[i] == lucknbr[j]){ redHitNub ++; break; } } } blueHiMbr = lucknbr[6] == usernubr[6] ? 1:0; System.out.println("中奖号码是："); printArray(lucknbr); System.out.println("您投注号码是："); printArray(usernubr); System.out.println("您命中了"+redHitNub+"个红球"); System.out.println("您"+(blueHiMbr == 1 ? "命中了":"没有命中")+"蓝球"); if(blueHiMbr == 1 && redHitNub < 3){ System.out.println("恭喜您，中了5元奖！"); }else if(blueHiMbr == 1 && redHitNub == 3 || blueHiMbr == 0 && redHitNub == 4){ System.out.println("恭喜您，中了10元奖！"); }else if(blueHiMbr == 1 && redHitNub == 4 || blueHiMbr == 0 && redHitNub == 5){ System.out.println("恭喜您，中了200元奖！"); }else if(blueHiMbr == 1 && redHitNub == 5){ System.out.println("恭喜您，中了300元奖！"); }else if(blueHiMbr == 0 && redHitNub == 6){ System.out.println("恭喜您，中了500万元奖！"); }else if(blueHiMbr == 1 && redHitNub == 6){ System.out.println("恭喜您，中了1000万元奖！"); }else { System.out.println("感谢你为福利事业做出贡献！"); } } public static void printArray(int[] arr){ for (int i = 0; i < arr.length; i++) { System.out.print(arr[i]+"\t"); } System.out.println(); } public static int[] usernubr(){ int[] nubers = new int[7]; Scanner sc = new Scanner(System.in); for (int i = 0; i < nubers.length-1; i++) { System.out.println("请您输入第" + (i+1) +"个红球号码(1-33，要求不重复)："); int date = sc.nextInt(); nubers[i] = date; } System.out.println("请您输入篮球号码（1-16）："); nubers[6] = sc.nextInt(); return nubers; } public static int[] cratenb(){ int[] numb = new int[7]; Random r = new Random(); for (int i = 0; i < numb.length - 1; i++) { while (true) { int data = r.nextInt(33) + 1; boolean flag = true; for(int j = 0; j < i; j++){ if(numb[j] == data){ flag = true; break; } } if(flag){ numb[i] = data; break; } } } numb[numb.length - 1] = r.nextInt(16) + 1; return numb; }}
来源地址：https://blog.csdn.net/asnowdream/article/details/127235002
