java基础编程案例_java代码例子

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;
    }
}
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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。");
    }
}
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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;
    }

}
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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("]");
    }
}
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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;
    }
}
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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]);
        }
    }
}
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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;
    }
}
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