我应该创建一个数学家教。我能够创建一个工作良好的指示。但是，我应该收集尝试的次数和正确的问题数量，并将它们发送到第二类。然后计算尝试的次数使用函数和计算正确的问题数量使用函数。图一个分数，并显示该信息。

public class Math_Tutor 
{

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) 
    {
        int choice;
        
        Scanner input = new Scanner(System.in);
        System.out.print("Please enter your name: ");
        String name = input.nextLine();
        Student student = new Student();
        student.setName(name);
        
        do
        {
            System.out.println("*** Math Tutor Menu ***");
            System.out.println(
            "Choose the type of problem:\n" +
            "1. Addition\n" +
            "2. Subtraction\n" +
            "3. Multiplication\n" +
            "4. Exit"
            );
            
            System.out.print("Enter your choice: ");
            choice = input.nextInt();
            
                switch (choice)
                {
                    case 1: 
                    addition();
                    break;
                    case 2:
                    subtraction();
                    break;
                    case 3:
                    multiplication();
                    break;
                }
                
        } while (choice!=4);
        
        student.results();

    }
    
    public static void addition()
    {
        int keepGoing;
        
        do 
        {
            int firstNum = (int)(Math.random() * 10);
            int secondNum = (int)(Math.random() * 10);
            int add = firstNum + secondNum;
            
            System.out.println(firstNum + " + " + secondNum + " ?");
            Scanner input = new Scanner(System.in);
            int addInput = input.nextInt();

            if (addInput == add)

            System.out.println("Correct!");
            
            else

            System.out.println("Your answer is wrong. The correct answer is "+ add);

            System.out.println("Would you like to keep going?\n"
                    + "1. Yes\n"
                    + "2. No");
            System.out.print("Enter your choice: ");
            keepGoing=input.nextInt();
            
        } while (keepGoing != 2);
    }
    
    public static void subtraction()
    {
        int keepGoing;

        do 
        {
            int firstNum = (int)(Math.random() * 10);
            int secondNum = (int)(Math.random() * 10);
            if (firstNum < secondNum)
            {
                int temp = firstNum;
                firstNum = secondNum;
                secondNum = temp;
            }
            int subtract = firstNum - secondNum;
            System.out.println(firstNum + " - " + secondNum + " ?");
            Scanner input = new Scanner(System.in);
            int subInput = input.nextInt();

            if (subInput == subtract)

            System.out.println("Correct!");

            else

            System.out.println("Your answer is wrong. The correct answer is "+ subtract);

            System.out.println("Would you like to keep going?\n"
                    + "1. Yes\n"
                    + "2. No");
            System.out.print("Enter your choice: ");
            keepGoing=input.nextInt();
       
        } while(keepGoing != 2);
    }
    
    public static void multiplication()
    {
        int keepGoing;

        do 
        {
            int firstNum = (int)(Math.random() * 10);
            int secondNum = (int)(Math.random() * 10);
            int multiply = firstNum * secondNum;
            System.out.println(firstNum + " * " + secondNum + " ?");
            Scanner input = new Scanner(System.in);
            int multInput = input.nextInt();

            if (multInput == multiply)

            System.out.println("Correct!");

            else

            System.out.println("Your answer is wrong. The correct answer is "+ multiply);

            System.out.println("Would you like to keep going?\n"
                    + "1. Yes\n"
                    + "2. No");
            System.out.print("Enter your choice: ");
            keepGoing=input.nextInt();
       
        } while(keepGoing != 2);
    }
    
}

这是第二节课

public class Student 
{   
        private String student;
        private int attempted;
        private int correct;
        private int score;
        
        
    public String setName(String name)
    {
        student = name;
        return student;
        
    }
    
    public int attempted(int attempt)
    {
        attempted = attempt;
        return attempted;
    }
    
    public int correct(int right)
    {
        correct = right;
        return correct;
    }
    
    public void results()
    {
        System.out.print("*** Results for " + student + " ***");
//        System.out.print("Total number of problems attempted: " + attempted);
//        System.out.print("Total number of problems correct: " + correct);
//        score = (correct / attempted) * 100;
//        System.out.print(student + " scored : " + score);
//        if (score >= 90)
//            System.out.print("Great work " + student);
//        else if (score >= 80 && score < 90)
//            System.out.print("Good work " + student);
//        else if (score >= 70 && score < 80)
//            System.out.print("Not bad " + student);
//        else 
//            System.out.print("Keep trying");
        
    }
}

我必须计算在加、减、乘函数中的尝试次数和正确的问题数，并将这些数字发送给学生类，我尝试过在几个地方创建变量，以便将计数发送给主类，这样我就可以将它们发送过来，但没有任何效果。

由于这是一个练习，我将避免解决它，但我会提供你所需要的指导，以确保你将能够解决它。
让我们考虑这个类：

public class Foo {
    //...
    public int getSomeValue() {
        return 42; // you can use your own value instead, this is just an example
    }
    //...
    public Foo() {} //An empty constructor for the sake of simplicity
    //...
}

现在，让我们考虑另一类

public class Bar {
    public void doSomething() {
        Foo foo = new Foo();
        int someValue = foo.getSomeValue();
        //Do something with someValue
    }
}

我们在doSomething中使用了getter，以便从Fooclass的foo示例中获取一些值。您也可以定义一个public数据成员，但我不推荐这样做。
回到您的示例：有一个名为setName的public setter是非常好的，但是您还需要区分数据阅读和数据写入，以便管理尝试的数据和正确的数据。目前有两个方法的setter和getter特性都很混乱。您需要有一个getAttempted方法才能读取它（这将从类外部使用以获取尝试的值）和一个setAttempted值来更改此值。然后，您将能够正确地设置和获取这些值。

2条答案

按热度按时间

eoxn13cs1#

您需要确保在main方法中创建的student对象可以从addition()、substraction()等方法访问。
要实现这一点，您可以将student对象作为参数传递给这些方法，或者将student声明为类MathTutor上的静态变量，如下所示：

public class MathTutor {
    private static Student student;

接下来，为了计算尝试次数，您需要从addition()、substraction()等中调用您学生的attempted和correct方法。我将这些方法更改为如下所示，以便它们增加student对象的内部计数器，例如：

public void addAttempt() {
    attempted++;
}

最后，results()方法可以打印出学生的成绩，就像在注解掉的代码中所做的那样。

赞(0）回复(0）举报 2023-03-11

jm81lzqq2#

java 数学导师将正确的变量和尝试的变量发送到第二节课

2条答案

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