java: Retirement

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/**  * 版权所有 2022 涂聚文有限公司  * 许可信息查看：  * 描述：  * Core Java, Volume I： Fundamentals， Twelfth Edition by Cay S.Horstamnn  * Core Java, Volume II： Advanced Features， Twelfth Edition by Cay S.Horstamnn  * Core Java  * 历史版本： JDK 17.01  * 2022-09-12 创建者 geovindu  * 2022-09-12 添加 Lambda  * 2022-09-12 修改：date  * 接口类  * 2022-09-12 修改者：Geovin Du  * 生成API帮助文档的指令：  *javadoc - -encoding Utf-8 -d apidoc LotteryDrawing.java  * Interface  * Record  * Annotation  * Enum  * */     package CoreJava.twelfth;   import java.util.*; /**  *  * */ public class LotteryDrawing {         /**      *      * */     public  void Draw()     {           Scanner in = new Scanner(System.in);           System.out.print("你需要画多少数字? ");         int k = in.nextInt();           System.out.print("你能画的最高数字是多少? ");         int n = in.nextInt();           // fill an array with numbers 1 2 3 . . . n         int[] numbers = new int[n];         for (int i = 0; i < numbers.length; i++)             numbers[i] = i + 1;           // draw k numbers and put them into a second array         int[] result = new int[k];         for (int i = 0; i < result.length; i++)         {             // make a random index between 0 and n - 1             int r = (int) (Math.random() * n);               // pick the element at the random location             result[i] = numbers[r];               // move the last element into the random location             numbers[r] = numbers[n - 1];             n--;         }           // print the sorted array         Arrays.sort(result);         System.out.println("下注以下组合。它会让你富有!");         for (int r : result)             System.out.println(r);         } }

　　

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/**  * 版权所有 2022 涂聚文有限公司  * 许可信息查看：  * 描述：  * Core Java, Volume I： Fundamentals， Twelfth Edition by Cay S.Horstamnn  * Core Java, Volume II： Advanced Features， Twelfth Edition by Cay S.Horstamnn  * Core Java  * 历史版本： JDK 17.01  * 2022-09-12 创建者 geovindu  * 2022-09-12 添加 Lambda  * 2022-09-12 修改：date  * 接口类  * 2022-09-12 修改者：Geovin Du  * 生成API帮助文档的指令：  *javadoc - -encoding Utf-8 -d apidoc Retirement.java  * Interface  * Record  * Annotation  * Enum  * */   package CoreJava.twelfth;   import java.util.*; /**  *  *  * */ public class Retirement {       /**      *      *      * */     public  void Calculate()     {         Scanner in = new Scanner(System.in);         System.out.print("你每年要捐多少钱? ");      double payment = in.nextDouble();         System.out.print("存款利率 %: ");         double interestRate = in.nextDouble();           double balance = 0;      int year = 0;        String input;           // update account balance while user isn't ready to retire       do     {         // add this year's payment and interest         balance += payment;         double interest = balance * interestRate / 100;         balance += interest;           year++;           // print current balance         System.out.printf("在 %d 年, 你的余额是 %,.2f%n", year, balance);           // ask if ready to retire and get input         System.out.print("准备退休了? (Y/N) ");         input = in.next();     }       while (input.equals("N")); }     }

　　

 

调用：

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//            LotteryDrawing lotteryDrawing=new LotteryDrawing();            lotteryDrawing.Draw();             ///            Retirement retirement=new Retirement();            retirement.Calculate();

　　

输出：

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你需要画多少数字? 20 你能画的最高数字是多少? 20 下注以下组合。它会让你富有! 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 你每年要捐多少钱? 2000 存款利率 %: 20 在 1 年, 你的余额是 2,400.00 准备退休了? (Y/N) y