java: Retirement

/**
 * 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);


    }
}

　　

/**
 * 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：

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

　　

输出：

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